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Paul E. McKenney says:

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A single commit that uses "arch_" atomic operations to avoid the
 instrumentation that comes with the non-"arch_" versions. In preparation
 for that commit, it also has another commit that makes these "arch_"
 atomic operations available to generic code.
 
 Without these commits, KCSAN uses can see pointless errors.
 
 Both from Peter Zijlstra.
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Merge tag 'rcu_urgent_for_5.8_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull RCU-vs-KCSAN fixes from Borislav Petkov:
 "A single commit that uses "arch_" atomic operations to avoid the
  instrumentation that comes with the non-"arch_" versions.

  In preparation for that commit, it also has another commit that makes
  these "arch_" atomic operations available to generic code.

  Without these commits, KCSAN uses can see pointless errors"

* tag 'rcu_urgent_for_5.8_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  rcu: Fixup noinstr warnings
  locking/atomics: Provide the arch_atomic_ interface to generic code
This commit is contained in:
Linus Torvalds 2020-06-28 10:29:38 -07:00
commit c141b30e99
4 changed files with 292 additions and 9 deletions
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236
include/linux/atomic-fallback.h
View File

@ -77,6 +77,9 @@
#endif /* cmpxchg64_relaxed */
#define arch_atomic_read atomic_read
#define arch_atomic_read_acquire atomic_read_acquire
#ifndef atomic_read_acquire
static __always_inline int
atomic_read_acquire(const atomic_t *v)
@ -86,6 +89,9 @@ atomic_read_acquire(const atomic_t *v)
#define atomic_read_acquire atomic_read_acquire
#endif
#define arch_atomic_set atomic_set
#define arch_atomic_set_release atomic_set_release
#ifndef atomic_set_release
static __always_inline void
atomic_set_release(atomic_t *v, int i)
@ -95,6 +101,13 @@ atomic_set_release(atomic_t *v, int i)
#define atomic_set_release atomic_set_release
#endif
#define arch_atomic_add atomic_add
#define arch_atomic_add_return atomic_add_return
#define arch_atomic_add_return_acquire atomic_add_return_acquire
#define arch_atomic_add_return_release atomic_add_return_release
#define arch_atomic_add_return_relaxed atomic_add_return_relaxed
#ifndef atomic_add_return_relaxed
#define atomic_add_return_acquire atomic_add_return
#define atomic_add_return_release atomic_add_return
@ -137,6 +150,11 @@ atomic_add_return(int i, atomic_t *v)
#endif /* atomic_add_return_relaxed */
#define arch_atomic_fetch_add atomic_fetch_add
#define arch_atomic_fetch_add_acquire atomic_fetch_add_acquire
#define arch_atomic_fetch_add_release atomic_fetch_add_release
#define arch_atomic_fetch_add_relaxed atomic_fetch_add_relaxed
#ifndef atomic_fetch_add_relaxed
#define atomic_fetch_add_acquire atomic_fetch_add
#define atomic_fetch_add_release atomic_fetch_add
@ -179,6 +197,13 @@ atomic_fetch_add(int i, atomic_t *v)
#endif /* atomic_fetch_add_relaxed */
#define arch_atomic_sub atomic_sub
#define arch_atomic_sub_return atomic_sub_return
#define arch_atomic_sub_return_acquire atomic_sub_return_acquire
#define arch_atomic_sub_return_release atomic_sub_return_release
#define arch_atomic_sub_return_relaxed atomic_sub_return_relaxed
#ifndef atomic_sub_return_relaxed
#define atomic_sub_return_acquire atomic_sub_return
#define atomic_sub_return_release atomic_sub_return
@ -221,6 +246,11 @@ atomic_sub_return(int i, atomic_t *v)
#endif /* atomic_sub_return_relaxed */
#define arch_atomic_fetch_sub atomic_fetch_sub
#define arch_atomic_fetch_sub_acquire atomic_fetch_sub_acquire
#define arch_atomic_fetch_sub_release atomic_fetch_sub_release
#define arch_atomic_fetch_sub_relaxed atomic_fetch_sub_relaxed
#ifndef atomic_fetch_sub_relaxed
#define atomic_fetch_sub_acquire atomic_fetch_sub
#define atomic_fetch_sub_release atomic_fetch_sub
@ -263,6 +293,8 @@ atomic_fetch_sub(int i, atomic_t *v)
#endif /* atomic_fetch_sub_relaxed */
#define arch_atomic_inc atomic_inc
#ifndef atomic_inc
static __always_inline void
atomic_inc(atomic_t *v)
@ -272,6 +304,11 @@ atomic_inc(atomic_t *v)
#define atomic_inc atomic_inc
#endif
#define arch_atomic_inc_return atomic_inc_return
#define arch_atomic_inc_return_acquire atomic_inc_return_acquire
#define arch_atomic_inc_return_release atomic_inc_return_release
#define arch_atomic_inc_return_relaxed atomic_inc_return_relaxed
#ifndef atomic_inc_return_relaxed
#ifdef atomic_inc_return
#define atomic_inc_return_acquire atomic_inc_return
@ -353,6 +390,11 @@ atomic_inc_return(atomic_t *v)
#endif /* atomic_inc_return_relaxed */
#define arch_atomic_fetch_inc atomic_fetch_inc
#define arch_atomic_fetch_inc_acquire atomic_fetch_inc_acquire
#define arch_atomic_fetch_inc_release atomic_fetch_inc_release
#define arch_atomic_fetch_inc_relaxed atomic_fetch_inc_relaxed
#ifndef atomic_fetch_inc_relaxed
#ifdef atomic_fetch_inc
#define atomic_fetch_inc_acquire atomic_fetch_inc
@ -434,6 +476,8 @@ atomic_fetch_inc(atomic_t *v)
#endif /* atomic_fetch_inc_relaxed */
#define arch_atomic_dec atomic_dec
#ifndef atomic_dec
static __always_inline void
atomic_dec(atomic_t *v)
@ -443,6 +487,11 @@ atomic_dec(atomic_t *v)
#define atomic_dec atomic_dec
#endif
#define arch_atomic_dec_return atomic_dec_return
#define arch_atomic_dec_return_acquire atomic_dec_return_acquire
#define arch_atomic_dec_return_release atomic_dec_return_release
#define arch_atomic_dec_return_relaxed atomic_dec_return_relaxed
#ifndef atomic_dec_return_relaxed
#ifdef atomic_dec_return
#define atomic_dec_return_acquire atomic_dec_return
@ -524,6 +573,11 @@ atomic_dec_return(atomic_t *v)
#endif /* atomic_dec_return_relaxed */
#define arch_atomic_fetch_dec atomic_fetch_dec
#define arch_atomic_fetch_dec_acquire atomic_fetch_dec_acquire
#define arch_atomic_fetch_dec_release atomic_fetch_dec_release
#define arch_atomic_fetch_dec_relaxed atomic_fetch_dec_relaxed
#ifndef atomic_fetch_dec_relaxed
#ifdef atomic_fetch_dec
#define atomic_fetch_dec_acquire atomic_fetch_dec
@ -605,6 +659,13 @@ atomic_fetch_dec(atomic_t *v)
#endif /* atomic_fetch_dec_relaxed */
#define arch_atomic_and atomic_and
#define arch_atomic_fetch_and atomic_fetch_and
#define arch_atomic_fetch_and_acquire atomic_fetch_and_acquire
#define arch_atomic_fetch_and_release atomic_fetch_and_release
#define arch_atomic_fetch_and_relaxed atomic_fetch_and_relaxed
#ifndef atomic_fetch_and_relaxed
#define atomic_fetch_and_acquire atomic_fetch_and
#define atomic_fetch_and_release atomic_fetch_and
@ -647,6 +708,8 @@ atomic_fetch_and(int i, atomic_t *v)
#endif /* atomic_fetch_and_relaxed */
#define arch_atomic_andnot atomic_andnot
#ifndef atomic_andnot
static __always_inline void
atomic_andnot(int i, atomic_t *v)
@ -656,6 +719,11 @@ atomic_andnot(int i, atomic_t *v)
#define atomic_andnot atomic_andnot
#endif
#define arch_atomic_fetch_andnot atomic_fetch_andnot
#define arch_atomic_fetch_andnot_acquire atomic_fetch_andnot_acquire
#define arch_atomic_fetch_andnot_release atomic_fetch_andnot_release
#define arch_atomic_fetch_andnot_relaxed atomic_fetch_andnot_relaxed
#ifndef atomic_fetch_andnot_relaxed
#ifdef atomic_fetch_andnot
#define atomic_fetch_andnot_acquire atomic_fetch_andnot
@ -737,6 +805,13 @@ atomic_fetch_andnot(int i, atomic_t *v)
#endif /* atomic_fetch_andnot_relaxed */
#define arch_atomic_or atomic_or
#define arch_atomic_fetch_or atomic_fetch_or
#define arch_atomic_fetch_or_acquire atomic_fetch_or_acquire
#define arch_atomic_fetch_or_release atomic_fetch_or_release
#define arch_atomic_fetch_or_relaxed atomic_fetch_or_relaxed
#ifndef atomic_fetch_or_relaxed
#define atomic_fetch_or_acquire atomic_fetch_or
#define atomic_fetch_or_release atomic_fetch_or
@ -779,6 +854,13 @@ atomic_fetch_or(int i, atomic_t *v)
#endif /* atomic_fetch_or_relaxed */
#define arch_atomic_xor atomic_xor
#define arch_atomic_fetch_xor atomic_fetch_xor
#define arch_atomic_fetch_xor_acquire atomic_fetch_xor_acquire
#define arch_atomic_fetch_xor_release atomic_fetch_xor_release
#define arch_atomic_fetch_xor_relaxed atomic_fetch_xor_relaxed
#ifndef atomic_fetch_xor_relaxed
#define atomic_fetch_xor_acquire atomic_fetch_xor
#define atomic_fetch_xor_release atomic_fetch_xor
@ -821,6 +903,11 @@ atomic_fetch_xor(int i, atomic_t *v)
#endif /* atomic_fetch_xor_relaxed */
#define arch_atomic_xchg atomic_xchg
#define arch_atomic_xchg_acquire atomic_xchg_acquire
#define arch_atomic_xchg_release atomic_xchg_release
#define arch_atomic_xchg_relaxed atomic_xchg_relaxed
#ifndef atomic_xchg_relaxed
#define atomic_xchg_acquire atomic_xchg
#define atomic_xchg_release atomic_xchg
@ -863,6 +950,11 @@ atomic_xchg(atomic_t *v, int i)
#endif /* atomic_xchg_relaxed */
#define arch_atomic_cmpxchg atomic_cmpxchg
#define arch_atomic_cmpxchg_acquire atomic_cmpxchg_acquire
#define arch_atomic_cmpxchg_release atomic_cmpxchg_release
#define arch_atomic_cmpxchg_relaxed atomic_cmpxchg_relaxed
#ifndef atomic_cmpxchg_relaxed
#define atomic_cmpxchg_acquire atomic_cmpxchg
#define atomic_cmpxchg_release atomic_cmpxchg
@ -905,6 +997,11 @@ atomic_cmpxchg(atomic_t *v, int old, int new)
#endif /* atomic_cmpxchg_relaxed */
#define arch_atomic_try_cmpxchg atomic_try_cmpxchg
#define arch_atomic_try_cmpxchg_acquire atomic_try_cmpxchg_acquire
#define arch_atomic_try_cmpxchg_release atomic_try_cmpxchg_release
#define arch_atomic_try_cmpxchg_relaxed atomic_try_cmpxchg_relaxed
#ifndef atomic_try_cmpxchg_relaxed
#ifdef atomic_try_cmpxchg
#define atomic_try_cmpxchg_acquire atomic_try_cmpxchg
@ -1002,6 +1099,8 @@ atomic_try_cmpxchg(atomic_t *v, int *old, int new)
#endif /* atomic_try_cmpxchg_relaxed */
#define arch_atomic_sub_and_test atomic_sub_and_test
#ifndef atomic_sub_and_test
/**
* atomic_sub_and_test - subtract value from variable and test result
@ -1020,6 +1119,8 @@ atomic_sub_and_test(int i, atomic_t *v)
#define atomic_sub_and_test atomic_sub_and_test
#endif
#define arch_atomic_dec_and_test atomic_dec_and_test
#ifndef atomic_dec_and_test
/**
* atomic_dec_and_test - decrement and test
@ -1037,6 +1138,8 @@ atomic_dec_and_test(atomic_t *v)
#define atomic_dec_and_test atomic_dec_and_test
#endif
#define arch_atomic_inc_and_test atomic_inc_and_test
#ifndef atomic_inc_and_test
/**
* atomic_inc_and_test - increment and test
@ -1054,6 +1157,8 @@ atomic_inc_and_test(atomic_t *v)
#define atomic_inc_and_test atomic_inc_and_test
#endif
#define arch_atomic_add_negative atomic_add_negative
#ifndef atomic_add_negative
/**
* atomic_add_negative - add and test if negative
@ -1072,6 +1177,8 @@ atomic_add_negative(int i, atomic_t *v)
#define atomic_add_negative atomic_add_negative
#endif
#define arch_atomic_fetch_add_unless atomic_fetch_add_unless
#ifndef atomic_fetch_add_unless
/**
* atomic_fetch_add_unless - add unless the number is already a given value
@ -1097,6 +1204,8 @@ atomic_fetch_add_unless(atomic_t *v, int a, int u)
#define atomic_fetch_add_unless atomic_fetch_add_unless
#endif
#define arch_atomic_add_unless atomic_add_unless
#ifndef atomic_add_unless
/**
* atomic_add_unless - add unless the number is already a given value
@ -1115,6 +1224,8 @@ atomic_add_unless(atomic_t *v, int a, int u)
#define atomic_add_unless atomic_add_unless
#endif
#define arch_atomic_inc_not_zero atomic_inc_not_zero
#ifndef atomic_inc_not_zero
/**
* atomic_inc_not_zero - increment unless the number is zero
@ -1131,6 +1242,8 @@ atomic_inc_not_zero(atomic_t *v)
#define atomic_inc_not_zero atomic_inc_not_zero
#endif
#define arch_atomic_inc_unless_negative atomic_inc_unless_negative
#ifndef atomic_inc_unless_negative
static __always_inline bool
atomic_inc_unless_negative(atomic_t *v)
@ -1147,6 +1260,8 @@ atomic_inc_unless_negative(atomic_t *v)
#define atomic_inc_unless_negative atomic_inc_unless_negative
#endif
#define arch_atomic_dec_unless_positive atomic_dec_unless_positive
#ifndef atomic_dec_unless_positive
static __always_inline bool
atomic_dec_unless_positive(atomic_t *v)
@ -1163,6 +1278,8 @@ atomic_dec_unless_positive(atomic_t *v)
#define atomic_dec_unless_positive atomic_dec_unless_positive
#endif
#define arch_atomic_dec_if_positive atomic_dec_if_positive
#ifndef atomic_dec_if_positive
static __always_inline int
atomic_dec_if_positive(atomic_t *v)
@ -1184,6 +1301,9 @@ atomic_dec_if_positive(atomic_t *v)
#include <asm-generic/atomic64.h>
#endif
#define arch_atomic64_read atomic64_read
#define arch_atomic64_read_acquire atomic64_read_acquire
#ifndef atomic64_read_acquire
static __always_inline s64
atomic64_read_acquire(const atomic64_t *v)
@ -1193,6 +1313,9 @@ atomic64_read_acquire(const atomic64_t *v)
#define atomic64_read_acquire atomic64_read_acquire
#endif
#define arch_atomic64_set atomic64_set
#define arch_atomic64_set_release atomic64_set_release
#ifndef atomic64_set_release
static __always_inline void
atomic64_set_release(atomic64_t *v, s64 i)
@ -1202,6 +1325,13 @@ atomic64_set_release(atomic64_t *v, s64 i)
#define atomic64_set_release atomic64_set_release
#endif
#define arch_atomic64_add atomic64_add
#define arch_atomic64_add_return atomic64_add_return
#define arch_atomic64_add_return_acquire atomic64_add_return_acquire
#define arch_atomic64_add_return_release atomic64_add_return_release
#define arch_atomic64_add_return_relaxed atomic64_add_return_relaxed
#ifndef atomic64_add_return_relaxed
#define atomic64_add_return_acquire atomic64_add_return
#define atomic64_add_return_release atomic64_add_return
@ -1244,6 +1374,11 @@ atomic64_add_return(s64 i, atomic64_t *v)
#endif /* atomic64_add_return_relaxed */
#define arch_atomic64_fetch_add atomic64_fetch_add
#define arch_atomic64_fetch_add_acquire atomic64_fetch_add_acquire
#define arch_atomic64_fetch_add_release atomic64_fetch_add_release
#define arch_atomic64_fetch_add_relaxed atomic64_fetch_add_relaxed
#ifndef atomic64_fetch_add_relaxed
#define atomic64_fetch_add_acquire atomic64_fetch_add
#define atomic64_fetch_add_release atomic64_fetch_add
@ -1286,6 +1421,13 @@ atomic64_fetch_add(s64 i, atomic64_t *v)
#endif /* atomic64_fetch_add_relaxed */
#define arch_atomic64_sub atomic64_sub
#define arch_atomic64_sub_return atomic64_sub_return
#define arch_atomic64_sub_return_acquire atomic64_sub_return_acquire
#define arch_atomic64_sub_return_release atomic64_sub_return_release
#define arch_atomic64_sub_return_relaxed atomic64_sub_return_relaxed
#ifndef atomic64_sub_return_relaxed
#define atomic64_sub_return_acquire atomic64_sub_return
#define atomic64_sub_return_release atomic64_sub_return
@ -1328,6 +1470,11 @@ atomic64_sub_return(s64 i, atomic64_t *v)
#endif /* atomic64_sub_return_relaxed */
#define arch_atomic64_fetch_sub atomic64_fetch_sub
#define arch_atomic64_fetch_sub_acquire atomic64_fetch_sub_acquire
#define arch_atomic64_fetch_sub_release atomic64_fetch_sub_release
#define arch_atomic64_fetch_sub_relaxed atomic64_fetch_sub_relaxed
#ifndef atomic64_fetch_sub_relaxed
#define atomic64_fetch_sub_acquire atomic64_fetch_sub
#define atomic64_fetch_sub_release atomic64_fetch_sub
@ -1370,6 +1517,8 @@ atomic64_fetch_sub(s64 i, atomic64_t *v)
#endif /* atomic64_fetch_sub_relaxed */
#define arch_atomic64_inc atomic64_inc
#ifndef atomic64_inc
static __always_inline void
atomic64_inc(atomic64_t *v)
@ -1379,6 +1528,11 @@ atomic64_inc(atomic64_t *v)
#define atomic64_inc atomic64_inc
#endif
#define arch_atomic64_inc_return atomic64_inc_return
#define arch_atomic64_inc_return_acquire atomic64_inc_return_acquire
#define arch_atomic64_inc_return_release atomic64_inc_return_release
#define arch_atomic64_inc_return_relaxed atomic64_inc_return_relaxed
#ifndef atomic64_inc_return_relaxed
#ifdef atomic64_inc_return
#define atomic64_inc_return_acquire atomic64_inc_return
@ -1460,6 +1614,11 @@ atomic64_inc_return(atomic64_t *v)
#endif /* atomic64_inc_return_relaxed */
#define arch_atomic64_fetch_inc atomic64_fetch_inc
#define arch_atomic64_fetch_inc_acquire atomic64_fetch_inc_acquire
#define arch_atomic64_fetch_inc_release atomic64_fetch_inc_release
#define arch_atomic64_fetch_inc_relaxed atomic64_fetch_inc_relaxed
#ifndef atomic64_fetch_inc_relaxed
#ifdef atomic64_fetch_inc
#define atomic64_fetch_inc_acquire atomic64_fetch_inc
@ -1541,6 +1700,8 @@ atomic64_fetch_inc(atomic64_t *v)
#endif /* atomic64_fetch_inc_relaxed */
#define arch_atomic64_dec atomic64_dec
#ifndef atomic64_dec
static __always_inline void
atomic64_dec(atomic64_t *v)
@ -1550,6 +1711,11 @@ atomic64_dec(atomic64_t *v)
#define atomic64_dec atomic64_dec
#endif
#define arch_atomic64_dec_return atomic64_dec_return
#define arch_atomic64_dec_return_acquire atomic64_dec_return_acquire
#define arch_atomic64_dec_return_release atomic64_dec_return_release
#define arch_atomic64_dec_return_relaxed atomic64_dec_return_relaxed
#ifndef atomic64_dec_return_relaxed
#ifdef atomic64_dec_return
#define atomic64_dec_return_acquire atomic64_dec_return
@ -1631,6 +1797,11 @@ atomic64_dec_return(atomic64_t *v)
#endif /* atomic64_dec_return_relaxed */
#define arch_atomic64_fetch_dec atomic64_fetch_dec
#define arch_atomic64_fetch_dec_acquire atomic64_fetch_dec_acquire
#define arch_atomic64_fetch_dec_release atomic64_fetch_dec_release
#define arch_atomic64_fetch_dec_relaxed atomic64_fetch_dec_relaxed
#ifndef atomic64_fetch_dec_relaxed
#ifdef atomic64_fetch_dec
#define atomic64_fetch_dec_acquire atomic64_fetch_dec
@ -1712,6 +1883,13 @@ atomic64_fetch_dec(atomic64_t *v)
#endif /* atomic64_fetch_dec_relaxed */
#define arch_atomic64_and atomic64_and
#define arch_atomic64_fetch_and atomic64_fetch_and
#define arch_atomic64_fetch_and_acquire atomic64_fetch_and_acquire
#define arch_atomic64_fetch_and_release atomic64_fetch_and_release
#define arch_atomic64_fetch_and_relaxed atomic64_fetch_and_relaxed
#ifndef atomic64_fetch_and_relaxed
#define atomic64_fetch_and_acquire atomic64_fetch_and
#define atomic64_fetch_and_release atomic64_fetch_and
@ -1754,6 +1932,8 @@ atomic64_fetch_and(s64 i, atomic64_t *v)
#endif /* atomic64_fetch_and_relaxed */
#define arch_atomic64_andnot atomic64_andnot
#ifndef atomic64_andnot
static __always_inline void
atomic64_andnot(s64 i, atomic64_t *v)
@ -1763,6 +1943,11 @@ atomic64_andnot(s64 i, atomic64_t *v)
#define atomic64_andnot atomic64_andnot
#endif
#define arch_atomic64_fetch_andnot atomic64_fetch_andnot
#define arch_atomic64_fetch_andnot_acquire atomic64_fetch_andnot_acquire
#define arch_atomic64_fetch_andnot_release atomic64_fetch_andnot_release
#define arch_atomic64_fetch_andnot_relaxed atomic64_fetch_andnot_relaxed
#ifndef atomic64_fetch_andnot_relaxed
#ifdef atomic64_fetch_andnot
#define atomic64_fetch_andnot_acquire atomic64_fetch_andnot
@ -1844,6 +2029,13 @@ atomic64_fetch_andnot(s64 i, atomic64_t *v)
#endif /* atomic64_fetch_andnot_relaxed */
#define arch_atomic64_or atomic64_or
#define arch_atomic64_fetch_or atomic64_fetch_or
#define arch_atomic64_fetch_or_acquire atomic64_fetch_or_acquire
#define arch_atomic64_fetch_or_release atomic64_fetch_or_release
#define arch_atomic64_fetch_or_relaxed atomic64_fetch_or_relaxed
#ifndef atomic64_fetch_or_relaxed
#define atomic64_fetch_or_acquire atomic64_fetch_or
#define atomic64_fetch_or_release atomic64_fetch_or
@ -1886,6 +2078,13 @@ atomic64_fetch_or(s64 i, atomic64_t *v)
#endif /* atomic64_fetch_or_relaxed */
#define arch_atomic64_xor atomic64_xor
#define arch_atomic64_fetch_xor atomic64_fetch_xor
#define arch_atomic64_fetch_xor_acquire atomic64_fetch_xor_acquire
#define arch_atomic64_fetch_xor_release atomic64_fetch_xor_release
#define arch_atomic64_fetch_xor_relaxed atomic64_fetch_xor_relaxed
#ifndef atomic64_fetch_xor_relaxed
#define atomic64_fetch_xor_acquire atomic64_fetch_xor
#define atomic64_fetch_xor_release atomic64_fetch_xor
@ -1928,6 +2127,11 @@ atomic64_fetch_xor(s64 i, atomic64_t *v)
#endif /* atomic64_fetch_xor_relaxed */
#define arch_atomic64_xchg atomic64_xchg
#define arch_atomic64_xchg_acquire atomic64_xchg_acquire
#define arch_atomic64_xchg_release atomic64_xchg_release
#define arch_atomic64_xchg_relaxed atomic64_xchg_relaxed
#ifndef atomic64_xchg_relaxed
#define atomic64_xchg_acquire atomic64_xchg
#define atomic64_xchg_release atomic64_xchg
@ -1970,6 +2174,11 @@ atomic64_xchg(atomic64_t *v, s64 i)
#endif /* atomic64_xchg_relaxed */
#define arch_atomic64_cmpxchg atomic64_cmpxchg
#define arch_atomic64_cmpxchg_acquire atomic64_cmpxchg_acquire
#define arch_atomic64_cmpxchg_release atomic64_cmpxchg_release
#define arch_atomic64_cmpxchg_relaxed atomic64_cmpxchg_relaxed
#ifndef atomic64_cmpxchg_relaxed
#define atomic64_cmpxchg_acquire atomic64_cmpxchg
#define atomic64_cmpxchg_release atomic64_cmpxchg
@ -2012,6 +2221,11 @@ atomic64_cmpxchg(atomic64_t *v, s64 old, s64 new)
#endif /* atomic64_cmpxchg_relaxed */
#define arch_atomic64_try_cmpxchg atomic64_try_cmpxchg
#define arch_atomic64_try_cmpxchg_acquire atomic64_try_cmpxchg_acquire
#define arch_atomic64_try_cmpxchg_release atomic64_try_cmpxchg_release
#define arch_atomic64_try_cmpxchg_relaxed atomic64_try_cmpxchg_relaxed
#ifndef atomic64_try_cmpxchg_relaxed
#ifdef atomic64_try_cmpxchg
#define atomic64_try_cmpxchg_acquire atomic64_try_cmpxchg
@ -2109,6 +2323,8 @@ atomic64_try_cmpxchg(atomic64_t *v, s64 *old, s64 new)
#endif /* atomic64_try_cmpxchg_relaxed */
#define arch_atomic64_sub_and_test atomic64_sub_and_test
#ifndef atomic64_sub_and_test
/**
* atomic64_sub_and_test - subtract value from variable and test result
@ -2127,6 +2343,8 @@ atomic64_sub_and_test(s64 i, atomic64_t *v)
#define atomic64_sub_and_test atomic64_sub_and_test
#endif
#define arch_atomic64_dec_and_test atomic64_dec_and_test
#ifndef atomic64_dec_and_test
/**
* atomic64_dec_and_test - decrement and test
@ -2144,6 +2362,8 @@ atomic64_dec_and_test(atomic64_t *v)
#define atomic64_dec_and_test atomic64_dec_and_test
#endif
#define arch_atomic64_inc_and_test atomic64_inc_and_test
#ifndef atomic64_inc_and_test
/**
* atomic64_inc_and_test - increment and test
@ -2161,6 +2381,8 @@ atomic64_inc_and_test(atomic64_t *v)
#define atomic64_inc_and_test atomic64_inc_and_test
#endif
#define arch_atomic64_add_negative atomic64_add_negative
#ifndef atomic64_add_negative
/**
* atomic64_add_negative - add and test if negative
@ -2179,6 +2401,8 @@ atomic64_add_negative(s64 i, atomic64_t *v)
#define atomic64_add_negative atomic64_add_negative
#endif
#define arch_atomic64_fetch_add_unless atomic64_fetch_add_unless
#ifndef atomic64_fetch_add_unless
/**
* atomic64_fetch_add_unless - add unless the number is already a given value
@ -2204,6 +2428,8 @@ atomic64_fetch_add_unless(atomic64_t *v, s64 a, s64 u)
#define atomic64_fetch_add_unless atomic64_fetch_add_unless
#endif
#define arch_atomic64_add_unless atomic64_add_unless
#ifndef atomic64_add_unless
/**
* atomic64_add_unless - add unless the number is already a given value
@ -2222,6 +2448,8 @@ atomic64_add_unless(atomic64_t *v, s64 a, s64 u)
#define atomic64_add_unless atomic64_add_unless
#endif
#define arch_atomic64_inc_not_zero atomic64_inc_not_zero
#ifndef atomic64_inc_not_zero
/**
* atomic64_inc_not_zero - increment unless the number is zero
@ -2238,6 +2466,8 @@ atomic64_inc_not_zero(atomic64_t *v)
#define atomic64_inc_not_zero atomic64_inc_not_zero
#endif
#define arch_atomic64_inc_unless_negative atomic64_inc_unless_negative
#ifndef atomic64_inc_unless_negative
static __always_inline bool
atomic64_inc_unless_negative(atomic64_t *v)
@ -2254,6 +2484,8 @@ atomic64_inc_unless_negative(atomic64_t *v)
#define atomic64_inc_unless_negative atomic64_inc_unless_negative
#endif
#define arch_atomic64_dec_unless_positive atomic64_dec_unless_positive
#ifndef atomic64_dec_unless_positive
static __always_inline bool
atomic64_dec_unless_positive(atomic64_t *v)
@ -2270,6 +2502,8 @@ atomic64_dec_unless_positive(atomic64_t *v)
#define atomic64_dec_unless_positive atomic64_dec_unless_positive
#endif
#define arch_atomic64_dec_if_positive atomic64_dec_if_positive
#ifndef atomic64_dec_if_positive
static __always_inline s64
atomic64_dec_if_positive(atomic64_t *v)
@ -2288,4 +2522,4 @@ atomic64_dec_if_positive(atomic64_t *v)
#endif
#endif /* _LINUX_ATOMIC_FALLBACK_H */
// 1fac0941c79bf0ae100723cc2ac9b94061f0b67a
// 9d95b56f98d82a2a26c7b79ccdd0c47572d50a6f

2
include/linux/compiler.h
View File

@ -123,7 +123,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
#ifdef CONFIG_DEBUG_ENTRY
/* Begin/end of an instrumentation safe region */
#define instrumentation_begin() ({ \
asm volatile("%c0:\n\t" \
asm volatile("%c0: nop\n\t" \
".pushsection .discard.instr_begin\n\t" \
".long %c0b - .\n\t" \
".popsection\n\t" : : "i" (__COUNTER__)); \

32
kernel/rcu/tree.c
View File

@ -250,7 +250,7 @@ static noinstr void rcu_dynticks_eqs_enter(void)
* next idle sojourn.
*/
rcu_dynticks_task_trace_enter(); // Before ->dynticks update!
seq = atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdp->dynticks);
seq = arch_atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdp->dynticks);
// RCU is no longer watching. Better be in extended quiescent state!
WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
(seq & RCU_DYNTICK_CTRL_CTR));
@ -274,13 +274,13 @@ static noinstr void rcu_dynticks_eqs_exit(void)
* and we also must force ordering with the next RCU read-side
* critical section.
*/
seq = atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdp->dynticks);
seq = arch_atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdp->dynticks);
// RCU is now watching. Better not be in an extended quiescent state!
rcu_dynticks_task_trace_exit(); // After ->dynticks update!
WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
!(seq & RCU_DYNTICK_CTRL_CTR));
if (seq & RCU_DYNTICK_CTRL_MASK) {
atomic_andnot(RCU_DYNTICK_CTRL_MASK, &rdp->dynticks);
arch_atomic_andnot(RCU_DYNTICK_CTRL_MASK, &rdp->dynticks);
smp_mb__after_atomic(); /* _exit after clearing mask. */
}
}
@ -313,7 +313,7 @@ static __always_inline bool rcu_dynticks_curr_cpu_in_eqs(void)
{
struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
return !(atomic_read(&rdp->dynticks) & RCU_DYNTICK_CTRL_CTR);
return !(arch_atomic_read(&rdp->dynticks) & RCU_DYNTICK_CTRL_CTR);
}
/*
@ -633,6 +633,10 @@ static noinstr void rcu_eqs_enter(bool user)
do_nocb_deferred_wakeup(rdp);
rcu_prepare_for_idle();
rcu_preempt_deferred_qs(current);
// instrumentation for the noinstr rcu_dynticks_eqs_enter()
instrument_atomic_write(&rdp->dynticks, sizeof(rdp->dynticks));
instrumentation_end();
WRITE_ONCE(rdp->dynticks_nesting, 0); /* Avoid irq-access tearing. */
// RCU is watching here ...
@ -692,6 +696,7 @@ noinstr void rcu_nmi_exit(void)
{
struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
instrumentation_begin();
/*
* Check for ->dynticks_nmi_nesting underflow and bad ->dynticks.
* (We are exiting an NMI handler, so RCU better be paying attention
@ -705,7 +710,6 @@ noinstr void rcu_nmi_exit(void)
* leave it in non-RCU-idle state.
*/
if (rdp->dynticks_nmi_nesting != 1) {
instrumentation_begin();
trace_rcu_dyntick(TPS("--="), rdp->dynticks_nmi_nesting, rdp->dynticks_nmi_nesting - 2,
atomic_read(&rdp->dynticks));
WRITE_ONCE(rdp->dynticks_nmi_nesting, /* No store tearing. */
@ -714,13 +718,15 @@ noinstr void rcu_nmi_exit(void)
return;
}
instrumentation_begin();
/* This NMI interrupted an RCU-idle CPU, restore RCU-idleness. */
trace_rcu_dyntick(TPS("Startirq"), rdp->dynticks_nmi_nesting, 0, atomic_read(&rdp->dynticks));
WRITE_ONCE(rdp->dynticks_nmi_nesting, 0); /* Avoid store tearing. */
if (!in_nmi())
rcu_prepare_for_idle();
// instrumentation for the noinstr rcu_dynticks_eqs_enter()
instrument_atomic_write(&rdp->dynticks, sizeof(rdp->dynticks));
instrumentation_end();
// RCU is watching here ...
@ -838,6 +844,10 @@ static void noinstr rcu_eqs_exit(bool user)
rcu_dynticks_eqs_exit();
// ... but is watching here.
instrumentation_begin();
// instrumentation for the noinstr rcu_dynticks_eqs_exit()
instrument_atomic_write(&rdp->dynticks, sizeof(rdp->dynticks));
rcu_cleanup_after_idle();
trace_rcu_dyntick(TPS("End"), rdp->dynticks_nesting, 1, atomic_read(&rdp->dynticks));
WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current));
@ -983,13 +993,21 @@ noinstr void rcu_nmi_enter(void)
if (!in_nmi())
rcu_cleanup_after_idle();
instrumentation_begin();
// instrumentation for the noinstr rcu_dynticks_curr_cpu_in_eqs()
instrument_atomic_read(&rdp->dynticks, sizeof(rdp->dynticks));
// instrumentation for the noinstr rcu_dynticks_eqs_exit()
instrument_atomic_write(&rdp->dynticks, sizeof(rdp->dynticks));
incby = 1;
} else if (!in_nmi()) {
instrumentation_begin();
rcu_irq_enter_check_tick();
instrumentation_end();
} else {
instrumentation_begin();
}
instrumentation_begin();
trace_rcu_dyntick(incby == 1 ? TPS("Endirq") : TPS("++="),
rdp->dynticks_nmi_nesting,
rdp->dynticks_nmi_nesting + incby, atomic_read(&rdp->dynticks));

31
scripts/atomic/gen-atomic-fallback.sh
View File

@ -58,6 +58,21 @@ cat << EOF
EOF
}
gen_proto_order_variant()
{
local meta="$1"; shift
local pfx="$1"; shift
local name="$1"; shift
local sfx="$1"; shift
local order="$1"; shift
local arch="$1"
local atomic="$2"
local basename="${arch}${atomic}_${pfx}${name}${sfx}"
printf "#define arch_${basename}${order} ${basename}${order}\n"
}
#gen_proto_order_variants(meta, pfx, name, sfx, arch, atomic, int, args...)
gen_proto_order_variants()
{
@ -72,6 +87,22 @@ gen_proto_order_variants()
local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
if [ -z "$arch" ]; then
gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
if meta_has_acquire "${meta}"; then
gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
fi
if meta_has_release "${meta}"; then
gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
fi
if meta_has_relaxed "${meta}"; then
gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
fi
echo ""
fi
# If we don't have relaxed atomics, then we don't bother with ordering fallbacks
# read_acquire and set_release need to be templated, though
if ! meta_has_relaxed "${meta}"; then