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powerpc updates for 5.5 #2
A few commits splitting the KASAN instrumented bitops header in three, to match the split of the asm-generic bitops headers. This is needed on powerpc because we use asm-generic/bitops/non-atomic.h, for the non-atomic bitops, whereas the existing KASAN instrumented bitops assume all the underlying operations are provided by the arch as arch_foo() versions. Thanks to: Daniel Axtens & Christophe Leroy. -----BEGIN PGP SIGNATURE----- iQJHBAABCAAxFiEEJFGtCPCthwEv2Y/bUevqPMjhpYAFAl3qN0wTHG1wZUBlbGxl cm1hbi5pZC5hdQAKCRBR6+o8yOGlgLWFD/4/e3CO1oWjQdDGjgvhydhmhjMQqI9m EINQjg3hl0ceig1HzsgjVdWI4TOf7bXbaQRf8m2pFWpA+iSx4KpjlnXzNjfUDapO JqzKYfVSdi0o6OAFigDYuN1V5F2jAgrM7/w5PKpVuiAABcgJNcEY59tgEMTdj9r0 9H3OekYv0UnZ5ZNsUhCibKVvVLdbtys3ALrm1YETAauCkY/lpNk6afcr33t0iw2l WAdd2sfWvw4tBn+35ZrNnv7z4hQ423Imd+lyuI5zhMBOOGspgMxlGGeIn370WyAi 00Jl66TRot6EtWGDVzV10bjB53qDhHrtNIk0NG2QMBB8vdTjBMtXfJnVc3Q8iVZ9 GkpdvMLNAlmxa4AuzpdHAOUQK48aggQzDmJkGp/JdYT6+WwTa5SLZcsy+njHGyjU It+728FnStilM1XvjnaN9pljqANEcN4/YIycK55XGDsZS9fVRMY/QMAQZbdLHfzc nB54Q/8vtPc9H69ws3U3g0ogVtYi5ca5RpTPiYU6WUQfEe9mjZdEgglsHC1y8ef2 9J3Muv4ASDGLjKN+G4dvKLCIgF+QKtsvwrtSztQq6wVnXUxuUQBEQSCaMPN9PN5g Hlkjk95WevXcHyXeE2r8cXndUTboIgWRMZp0AHao44du3EziPMCvE0tFAHOEWfV0 8Oty9Fo5QSb1Mw== =FCVX -----END PGP SIGNATURE----- Merge tag 'powerpc-5.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull more powerpc updates from Michael Ellerman: "A few commits splitting the KASAN instrumented bitops header in three, to match the split of the asm-generic bitops headers. This is needed on powerpc because we use the generic bitops for the non-atomic case only, whereas the existing KASAN instrumented bitops assume all the underlying operations are provided by the arch as arch_foo() versions. Thanks to: Daniel Axtens & Christophe Leroy" * tag 'powerpc-5.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: docs/core-api: Remove possibly confusing sub-headings from Bit Operations powerpc: support KASAN instrumentation of bitops kasan: support instrumented bitops combined with generic bitops
This commit is contained in:
Linus Torvalds
commit
43a2898631
@ -57,7 +57,13 @@ The Linux kernel provides more basic utility functions.
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Bit Operations
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--------------
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.. kernel-doc:: include/asm-generic/bitops-instrumented.h
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.. kernel-doc:: include/asm-generic/bitops/instrumented-atomic.h
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:internal:
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.. kernel-doc:: include/asm-generic/bitops/instrumented-non-atomic.h
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:internal:
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.. kernel-doc:: include/asm-generic/bitops/instrumented-lock.h
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:internal:
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Bitmap Operations
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@ -64,7 +64,7 @@
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/* Macro for generating the ***_bits() functions */
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#define DEFINE_BITOP(fn, op, prefix) \
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static __inline__ void fn(unsigned long mask, \
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static inline void fn(unsigned long mask, \
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volatile unsigned long *_p) \
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{ \
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unsigned long old; \
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@ -86,22 +86,22 @@ DEFINE_BITOP(clear_bits, andc, "")
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DEFINE_BITOP(clear_bits_unlock, andc, PPC_RELEASE_BARRIER)
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DEFINE_BITOP(change_bits, xor, "")
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static __inline__ void set_bit(int nr, volatile unsigned long *addr)
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static inline void arch_set_bit(int nr, volatile unsigned long *addr)
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{
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set_bits(BIT_MASK(nr), addr + BIT_WORD(nr));
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}
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static __inline__ void clear_bit(int nr, volatile unsigned long *addr)
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static inline void arch_clear_bit(int nr, volatile unsigned long *addr)
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{
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clear_bits(BIT_MASK(nr), addr + BIT_WORD(nr));
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}
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static __inline__ void clear_bit_unlock(int nr, volatile unsigned long *addr)
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static inline void arch_clear_bit_unlock(int nr, volatile unsigned long *addr)
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{
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clear_bits_unlock(BIT_MASK(nr), addr + BIT_WORD(nr));
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}
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static __inline__ void change_bit(int nr, volatile unsigned long *addr)
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static inline void arch_change_bit(int nr, volatile unsigned long *addr)
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{
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change_bits(BIT_MASK(nr), addr + BIT_WORD(nr));
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}
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@ -109,7 +109,7 @@ static __inline__ void change_bit(int nr, volatile unsigned long *addr)
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/* Like DEFINE_BITOP(), with changes to the arguments to 'op' and the output
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* operands. */
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#define DEFINE_TESTOP(fn, op, prefix, postfix, eh) \
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static __inline__ unsigned long fn( \
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static inline unsigned long fn( \
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unsigned long mask, \
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volatile unsigned long *_p) \
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{ \
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@ -138,34 +138,34 @@ DEFINE_TESTOP(test_and_clear_bits, andc, PPC_ATOMIC_ENTRY_BARRIER,
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DEFINE_TESTOP(test_and_change_bits, xor, PPC_ATOMIC_ENTRY_BARRIER,
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PPC_ATOMIC_EXIT_BARRIER, 0)
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static __inline__ int test_and_set_bit(unsigned long nr,
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volatile unsigned long *addr)
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static inline int arch_test_and_set_bit(unsigned long nr,
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volatile unsigned long *addr)
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{
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return test_and_set_bits(BIT_MASK(nr), addr + BIT_WORD(nr)) != 0;
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}
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static __inline__ int test_and_set_bit_lock(unsigned long nr,
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volatile unsigned long *addr)
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static inline int arch_test_and_set_bit_lock(unsigned long nr,
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volatile unsigned long *addr)
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{
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return test_and_set_bits_lock(BIT_MASK(nr),
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addr + BIT_WORD(nr)) != 0;
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}
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static __inline__ int test_and_clear_bit(unsigned long nr,
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volatile unsigned long *addr)
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static inline int arch_test_and_clear_bit(unsigned long nr,
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volatile unsigned long *addr)
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{
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return test_and_clear_bits(BIT_MASK(nr), addr + BIT_WORD(nr)) != 0;
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}
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static __inline__ int test_and_change_bit(unsigned long nr,
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volatile unsigned long *addr)
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static inline int arch_test_and_change_bit(unsigned long nr,
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volatile unsigned long *addr)
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{
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return test_and_change_bits(BIT_MASK(nr), addr + BIT_WORD(nr)) != 0;
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}
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#ifdef CONFIG_PPC64
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static __inline__ unsigned long clear_bit_unlock_return_word(int nr,
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volatile unsigned long *addr)
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static inline unsigned long
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clear_bit_unlock_return_word(int nr, volatile unsigned long *addr)
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{
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unsigned long old, t;
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unsigned long *p = (unsigned long *)addr + BIT_WORD(nr);
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@ -185,15 +185,18 @@ static __inline__ unsigned long clear_bit_unlock_return_word(int nr,
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return old;
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}
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/* This is a special function for mm/filemap.c */
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#define clear_bit_unlock_is_negative_byte(nr, addr) \
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(clear_bit_unlock_return_word(nr, addr) & BIT_MASK(PG_waiters))
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/*
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* This is a special function for mm/filemap.c
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* Bit 7 corresponds to PG_waiters.
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*/
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#define arch_clear_bit_unlock_is_negative_byte(nr, addr) \
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(clear_bit_unlock_return_word(nr, addr) & BIT_MASK(7))
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#endif /* CONFIG_PPC64 */
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#include <asm-generic/bitops/non-atomic.h>
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static __inline__ void __clear_bit_unlock(int nr, volatile unsigned long *addr)
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static inline void arch___clear_bit_unlock(int nr, volatile unsigned long *addr)
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{
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__asm__ __volatile__(PPC_RELEASE_BARRIER "" ::: "memory");
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__clear_bit(nr, addr);
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@ -215,14 +218,14 @@ static __inline__ void __clear_bit_unlock(int nr, volatile unsigned long *addr)
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* fls: find last (most-significant) bit set.
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* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
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*/
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static __inline__ int fls(unsigned int x)
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static inline int fls(unsigned int x)
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{
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return 32 - __builtin_clz(x);
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}
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#include <asm-generic/bitops/builtin-__fls.h>
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static __inline__ int fls64(__u64 x)
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static inline int fls64(__u64 x)
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{
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return 64 - __builtin_clzll(x);
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}
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@ -239,6 +242,10 @@ unsigned long __arch_hweight64(__u64 w);
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#include <asm-generic/bitops/find.h>
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/* wrappers that deal with KASAN instrumentation */
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#include <asm-generic/bitops/instrumented-atomic.h>
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#include <asm-generic/bitops/instrumented-lock.h>
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/* Little-endian versions */
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#include <asm-generic/bitops/le.h>
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@ -241,7 +241,9 @@ static inline void arch___clear_bit_unlock(unsigned long nr,
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arch___clear_bit(nr, ptr);
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}
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#include <asm-generic/bitops-instrumented.h>
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#include <asm-generic/bitops/instrumented-atomic.h>
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#include <asm-generic/bitops/instrumented-non-atomic.h>
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#include <asm-generic/bitops/instrumented-lock.h>
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/*
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* Functions which use MSB0 bit numbering.
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@ -388,7 +388,9 @@ static __always_inline int fls64(__u64 x)
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#include <asm-generic/bitops/const_hweight.h>
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#include <asm-generic/bitops-instrumented.h>
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#include <asm-generic/bitops/instrumented-atomic.h>
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#include <asm-generic/bitops/instrumented-non-atomic.h>
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#include <asm-generic/bitops/instrumented-lock.h>
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#include <asm-generic/bitops/le.h>
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@ -1,263 +0,0 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* This file provides wrappers with sanitizer instrumentation for bit
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* operations.
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*
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* To use this functionality, an arch's bitops.h file needs to define each of
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* the below bit operations with an arch_ prefix (e.g. arch_set_bit(),
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* arch___set_bit(), etc.).
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*/
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#ifndef _ASM_GENERIC_BITOPS_INSTRUMENTED_H
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#define _ASM_GENERIC_BITOPS_INSTRUMENTED_H
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#include <linux/kasan-checks.h>
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/**
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* set_bit - Atomically set a bit in memory
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* @nr: the bit to set
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* @addr: the address to start counting from
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*
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* This is a relaxed atomic operation (no implied memory barriers).
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*
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* Note that @nr may be almost arbitrarily large; this function is not
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* restricted to acting on a single-word quantity.
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*/
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static inline void set_bit(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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arch_set_bit(nr, addr);
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}
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/**
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* __set_bit - Set a bit in memory
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* @nr: the bit to set
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* @addr: the address to start counting from
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*
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* Unlike set_bit(), this function is non-atomic. If it is called on the same
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* region of memory concurrently, the effect may be that only one operation
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* succeeds.
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*/
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static inline void __set_bit(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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arch___set_bit(nr, addr);
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}
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/**
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* clear_bit - Clears a bit in memory
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* @nr: Bit to clear
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* @addr: Address to start counting from
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*
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* This is a relaxed atomic operation (no implied memory barriers).
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*/
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static inline void clear_bit(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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arch_clear_bit(nr, addr);
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}
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/**
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* __clear_bit - Clears a bit in memory
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* @nr: the bit to clear
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* @addr: the address to start counting from
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*
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* Unlike clear_bit(), this function is non-atomic. If it is called on the same
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* region of memory concurrently, the effect may be that only one operation
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* succeeds.
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*/
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static inline void __clear_bit(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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arch___clear_bit(nr, addr);
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}
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/**
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* clear_bit_unlock - Clear a bit in memory, for unlock
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* @nr: the bit to set
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* @addr: the address to start counting from
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*
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* This operation is atomic and provides release barrier semantics.
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*/
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static inline void clear_bit_unlock(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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arch_clear_bit_unlock(nr, addr);
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}
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/**
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* __clear_bit_unlock - Clears a bit in memory
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* @nr: Bit to clear
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* @addr: Address to start counting from
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*
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* This is a non-atomic operation but implies a release barrier before the
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* memory operation. It can be used for an unlock if no other CPUs can
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* concurrently modify other bits in the word.
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*/
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static inline void __clear_bit_unlock(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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arch___clear_bit_unlock(nr, addr);
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}
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/**
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* change_bit - Toggle a bit in memory
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* @nr: Bit to change
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* @addr: Address to start counting from
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*
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* This is a relaxed atomic operation (no implied memory barriers).
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*
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* Note that @nr may be almost arbitrarily large; this function is not
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* restricted to acting on a single-word quantity.
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*/
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static inline void change_bit(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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arch_change_bit(nr, addr);
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}
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/**
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* __change_bit - Toggle a bit in memory
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* @nr: the bit to change
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* @addr: the address to start counting from
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*
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* Unlike change_bit(), this function is non-atomic. If it is called on the same
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* region of memory concurrently, the effect may be that only one operation
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* succeeds.
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*/
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static inline void __change_bit(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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arch___change_bit(nr, addr);
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}
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/**
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* test_and_set_bit - Set a bit and return its old value
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* @nr: Bit to set
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* @addr: Address to count from
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*
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* This is an atomic fully-ordered operation (implied full memory barrier).
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*/
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static inline bool test_and_set_bit(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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return arch_test_and_set_bit(nr, addr);
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}
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/**
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* __test_and_set_bit - Set a bit and return its old value
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* @nr: Bit to set
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* @addr: Address to count from
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*
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* This operation is non-atomic. If two instances of this operation race, one
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* can appear to succeed but actually fail.
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*/
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static inline bool __test_and_set_bit(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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return arch___test_and_set_bit(nr, addr);
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}
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/**
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* test_and_set_bit_lock - Set a bit and return its old value, for lock
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* @nr: Bit to set
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* @addr: Address to count from
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*
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* This operation is atomic and provides acquire barrier semantics if
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* the returned value is 0.
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* It can be used to implement bit locks.
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*/
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static inline bool test_and_set_bit_lock(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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return arch_test_and_set_bit_lock(nr, addr);
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}
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/**
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* test_and_clear_bit - Clear a bit and return its old value
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* @nr: Bit to clear
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* @addr: Address to count from
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*
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* This is an atomic fully-ordered operation (implied full memory barrier).
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*/
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static inline bool test_and_clear_bit(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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return arch_test_and_clear_bit(nr, addr);
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}
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/**
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* __test_and_clear_bit - Clear a bit and return its old value
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* @nr: Bit to clear
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* @addr: Address to count from
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*
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* This operation is non-atomic. If two instances of this operation race, one
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* can appear to succeed but actually fail.
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*/
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static inline bool __test_and_clear_bit(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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return arch___test_and_clear_bit(nr, addr);
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}
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/**
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* test_and_change_bit - Change a bit and return its old value
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* @nr: Bit to change
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* @addr: Address to count from
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*
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* This is an atomic fully-ordered operation (implied full memory barrier).
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*/
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static inline bool test_and_change_bit(long nr, volatile unsigned long *addr)
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{
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kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
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return arch_test_and_change_bit(nr, addr);
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}
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/**
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* __test_and_change_bit - Change a bit and return its old value
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* @nr: Bit to change
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* @addr: Address to count from
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*
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* This operation is non-atomic. If two instances of this operation race, one
|
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* can appear to succeed but actually fail.
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*/
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||||
static inline bool __test_and_change_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
return arch___test_and_change_bit(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* test_bit - Determine whether a bit is set
|
||||
* @nr: bit number to test
|
||||
* @addr: Address to start counting from
|
||||
*/
|
||||
static inline bool test_bit(long nr, const volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_read(addr + BIT_WORD(nr), sizeof(long));
|
||||
return arch_test_bit(nr, addr);
|
||||
}
|
||||
|
||||
#if defined(arch_clear_bit_unlock_is_negative_byte)
|
||||
/**
|
||||
* clear_bit_unlock_is_negative_byte - Clear a bit in memory and test if bottom
|
||||
* byte is negative, for unlock.
|
||||
* @nr: the bit to clear
|
||||
* @addr: the address to start counting from
|
||||
*
|
||||
* This operation is atomic and provides release barrier semantics.
|
||||
*
|
||||
* This is a bit of a one-trick-pony for the filemap code, which clears
|
||||
* PG_locked and tests PG_waiters,
|
||||
*/
|
||||
static inline bool
|
||||
clear_bit_unlock_is_negative_byte(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
return arch_clear_bit_unlock_is_negative_byte(nr, addr);
|
||||
}
|
||||
/* Let everybody know we have it. */
|
||||
#define clear_bit_unlock_is_negative_byte clear_bit_unlock_is_negative_byte
|
||||
#endif
|
||||
|
||||
#endif /* _ASM_GENERIC_BITOPS_INSTRUMENTED_H */
|
||||
100
include/asm-generic/bitops/instrumented-atomic.h
Normal file
100
include/asm-generic/bitops/instrumented-atomic.h
Normal file
@ -0,0 +1,100 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
|
||||
/*
|
||||
* This file provides wrappers with sanitizer instrumentation for atomic bit
|
||||
* operations.
|
||||
*
|
||||
* To use this functionality, an arch's bitops.h file needs to define each of
|
||||
* the below bit operations with an arch_ prefix (e.g. arch_set_bit(),
|
||||
* arch___set_bit(), etc.).
|
||||
*/
|
||||
#ifndef _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H
|
||||
#define _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H
|
||||
|
||||
#include <linux/kasan-checks.h>
|
||||
|
||||
/**
|
||||
* set_bit - Atomically set a bit in memory
|
||||
* @nr: the bit to set
|
||||
* @addr: the address to start counting from
|
||||
*
|
||||
* This is a relaxed atomic operation (no implied memory barriers).
|
||||
*
|
||||
* Note that @nr may be almost arbitrarily large; this function is not
|
||||
* restricted to acting on a single-word quantity.
|
||||
*/
|
||||
static inline void set_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
arch_set_bit(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* clear_bit - Clears a bit in memory
|
||||
* @nr: Bit to clear
|
||||
* @addr: Address to start counting from
|
||||
*
|
||||
* This is a relaxed atomic operation (no implied memory barriers).
|
||||
*/
|
||||
static inline void clear_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
arch_clear_bit(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* change_bit - Toggle a bit in memory
|
||||
* @nr: Bit to change
|
||||
* @addr: Address to start counting from
|
||||
*
|
||||
* This is a relaxed atomic operation (no implied memory barriers).
|
||||
*
|
||||
* Note that @nr may be almost arbitrarily large; this function is not
|
||||
* restricted to acting on a single-word quantity.
|
||||
*/
|
||||
static inline void change_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
arch_change_bit(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* test_and_set_bit - Set a bit and return its old value
|
||||
* @nr: Bit to set
|
||||
* @addr: Address to count from
|
||||
*
|
||||
* This is an atomic fully-ordered operation (implied full memory barrier).
|
||||
*/
|
||||
static inline bool test_and_set_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
return arch_test_and_set_bit(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* test_and_clear_bit - Clear a bit and return its old value
|
||||
* @nr: Bit to clear
|
||||
* @addr: Address to count from
|
||||
*
|
||||
* This is an atomic fully-ordered operation (implied full memory barrier).
|
||||
*/
|
||||
static inline bool test_and_clear_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
return arch_test_and_clear_bit(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* test_and_change_bit - Change a bit and return its old value
|
||||
* @nr: Bit to change
|
||||
* @addr: Address to count from
|
||||
*
|
||||
* This is an atomic fully-ordered operation (implied full memory barrier).
|
||||
*/
|
||||
static inline bool test_and_change_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
return arch_test_and_change_bit(nr, addr);
|
||||
}
|
||||
|
||||
#endif /* _ASM_GENERIC_BITOPS_INSTRUMENTED_NON_ATOMIC_H */
|
||||
81
include/asm-generic/bitops/instrumented-lock.h
Normal file
81
include/asm-generic/bitops/instrumented-lock.h
Normal file
@ -0,0 +1,81 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
|
||||
/*
|
||||
* This file provides wrappers with sanitizer instrumentation for bit
|
||||
* locking operations.
|
||||
*
|
||||
* To use this functionality, an arch's bitops.h file needs to define each of
|
||||
* the below bit operations with an arch_ prefix (e.g. arch_set_bit(),
|
||||
* arch___set_bit(), etc.).
|
||||
*/
|
||||
#ifndef _ASM_GENERIC_BITOPS_INSTRUMENTED_LOCK_H
|
||||
#define _ASM_GENERIC_BITOPS_INSTRUMENTED_LOCK_H
|
||||
|
||||
#include <linux/kasan-checks.h>
|
||||
|
||||
/**
|
||||
* clear_bit_unlock - Clear a bit in memory, for unlock
|
||||
* @nr: the bit to set
|
||||
* @addr: the address to start counting from
|
||||
*
|
||||
* This operation is atomic and provides release barrier semantics.
|
||||
*/
|
||||
static inline void clear_bit_unlock(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
arch_clear_bit_unlock(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* __clear_bit_unlock - Clears a bit in memory
|
||||
* @nr: Bit to clear
|
||||
* @addr: Address to start counting from
|
||||
*
|
||||
* This is a non-atomic operation but implies a release barrier before the
|
||||
* memory operation. It can be used for an unlock if no other CPUs can
|
||||
* concurrently modify other bits in the word.
|
||||
*/
|
||||
static inline void __clear_bit_unlock(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
arch___clear_bit_unlock(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* test_and_set_bit_lock - Set a bit and return its old value, for lock
|
||||
* @nr: Bit to set
|
||||
* @addr: Address to count from
|
||||
*
|
||||
* This operation is atomic and provides acquire barrier semantics if
|
||||
* the returned value is 0.
|
||||
* It can be used to implement bit locks.
|
||||
*/
|
||||
static inline bool test_and_set_bit_lock(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
return arch_test_and_set_bit_lock(nr, addr);
|
||||
}
|
||||
|
||||
#if defined(arch_clear_bit_unlock_is_negative_byte)
|
||||
/**
|
||||
* clear_bit_unlock_is_negative_byte - Clear a bit in memory and test if bottom
|
||||
* byte is negative, for unlock.
|
||||
* @nr: the bit to clear
|
||||
* @addr: the address to start counting from
|
||||
*
|
||||
* This operation is atomic and provides release barrier semantics.
|
||||
*
|
||||
* This is a bit of a one-trick-pony for the filemap code, which clears
|
||||
* PG_locked and tests PG_waiters,
|
||||
*/
|
||||
static inline bool
|
||||
clear_bit_unlock_is_negative_byte(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
return arch_clear_bit_unlock_is_negative_byte(nr, addr);
|
||||
}
|
||||
/* Let everybody know we have it. */
|
||||
#define clear_bit_unlock_is_negative_byte clear_bit_unlock_is_negative_byte
|
||||
#endif
|
||||
|
||||
#endif /* _ASM_GENERIC_BITOPS_INSTRUMENTED_LOCK_H */
|
||||
114
include/asm-generic/bitops/instrumented-non-atomic.h
Normal file
114
include/asm-generic/bitops/instrumented-non-atomic.h
Normal file
@ -0,0 +1,114 @@
|
||||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
|
||||
/*
|
||||
* This file provides wrappers with sanitizer instrumentation for non-atomic
|
||||
* bit operations.
|
||||
*
|
||||
* To use this functionality, an arch's bitops.h file needs to define each of
|
||||
* the below bit operations with an arch_ prefix (e.g. arch_set_bit(),
|
||||
* arch___set_bit(), etc.).
|
||||
*/
|
||||
#ifndef _ASM_GENERIC_BITOPS_INSTRUMENTED_NON_ATOMIC_H
|
||||
#define _ASM_GENERIC_BITOPS_INSTRUMENTED_NON_ATOMIC_H
|
||||
|
||||
#include <linux/kasan-checks.h>
|
||||
|
||||
/**
|
||||
* __set_bit - Set a bit in memory
|
||||
* @nr: the bit to set
|
||||
* @addr: the address to start counting from
|
||||
*
|
||||
* Unlike set_bit(), this function is non-atomic. If it is called on the same
|
||||
* region of memory concurrently, the effect may be that only one operation
|
||||
* succeeds.
|
||||
*/
|
||||
static inline void __set_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
arch___set_bit(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* __clear_bit - Clears a bit in memory
|
||||
* @nr: the bit to clear
|
||||
* @addr: the address to start counting from
|
||||
*
|
||||
* Unlike clear_bit(), this function is non-atomic. If it is called on the same
|
||||
* region of memory concurrently, the effect may be that only one operation
|
||||
* succeeds.
|
||||
*/
|
||||
static inline void __clear_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
arch___clear_bit(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* __change_bit - Toggle a bit in memory
|
||||
* @nr: the bit to change
|
||||
* @addr: the address to start counting from
|
||||
*
|
||||
* Unlike change_bit(), this function is non-atomic. If it is called on the same
|
||||
* region of memory concurrently, the effect may be that only one operation
|
||||
* succeeds.
|
||||
*/
|
||||
static inline void __change_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
arch___change_bit(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* __test_and_set_bit - Set a bit and return its old value
|
||||
* @nr: Bit to set
|
||||
* @addr: Address to count from
|
||||
*
|
||||
* This operation is non-atomic. If two instances of this operation race, one
|
||||
* can appear to succeed but actually fail.
|
||||
*/
|
||||
static inline bool __test_and_set_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
return arch___test_and_set_bit(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* __test_and_clear_bit - Clear a bit and return its old value
|
||||
* @nr: Bit to clear
|
||||
* @addr: Address to count from
|
||||
*
|
||||
* This operation is non-atomic. If two instances of this operation race, one
|
||||
* can appear to succeed but actually fail.
|
||||
*/
|
||||
static inline bool __test_and_clear_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
return arch___test_and_clear_bit(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* __test_and_change_bit - Change a bit and return its old value
|
||||
* @nr: Bit to change
|
||||
* @addr: Address to count from
|
||||
*
|
||||
* This operation is non-atomic. If two instances of this operation race, one
|
||||
* can appear to succeed but actually fail.
|
||||
*/
|
||||
static inline bool __test_and_change_bit(long nr, volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
|
||||
return arch___test_and_change_bit(nr, addr);
|
||||
}
|
||||
|
||||
/**
|
||||
* test_bit - Determine whether a bit is set
|
||||
* @nr: bit number to test
|
||||
* @addr: Address to start counting from
|
||||
*/
|
||||
static inline bool test_bit(long nr, const volatile unsigned long *addr)
|
||||
{
|
||||
kasan_check_read(addr + BIT_WORD(nr), sizeof(long));
|
||||
return arch_test_bit(nr, addr);
|
||||
}
|
||||
|
||||
#endif /* _ASM_GENERIC_BITOPS_INSTRUMENTED_NON_ATOMIC_H */
|
||||
Loading…
Reference in New Issue
Block a user