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alpha: no need to include asm/xchg.h twice
We used to generate different helpers for local and full
{cmp,}xchg(); these days the barriers are in arch_{cmp,}xchg()
instead and generated helpers are identical for local and
full cases. No need for those parametrized includes of
asm/xchg.h - we might as well insert its contents directly
in asm/cmpxchg.h and do it only once.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
Arnd Bergmann
parent
47ac09b91b
commit
7193b5c475
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@ -3,17 +3,232 @@
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#define _ALPHA_CMPXCHG_H
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/*
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* Atomic exchange routines.
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* Atomic exchange.
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* Since it can be used to implement critical sections
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* it must clobber "memory" (also for interrupts in UP).
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*/
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#define ____xchg(type, args...) __arch_xchg ## type ## _local(args)
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#define ____cmpxchg(type, args...) __cmpxchg ## type ## _local(args)
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#include <asm/xchg.h>
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static inline unsigned long
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____xchg_u8(volatile char *m, unsigned long val)
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{
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unsigned long ret, tmp, addr64;
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__asm__ __volatile__(
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" andnot %4,7,%3\n"
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" insbl %1,%4,%1\n"
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"1: ldq_l %2,0(%3)\n"
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" extbl %2,%4,%0\n"
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" mskbl %2,%4,%2\n"
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" or %1,%2,%2\n"
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" stq_c %2,0(%3)\n"
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" beq %2,2f\n"
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
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: "r" ((long)m), "1" (val) : "memory");
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return ret;
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}
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static inline unsigned long
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____xchg_u16(volatile short *m, unsigned long val)
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{
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unsigned long ret, tmp, addr64;
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__asm__ __volatile__(
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" andnot %4,7,%3\n"
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" inswl %1,%4,%1\n"
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"1: ldq_l %2,0(%3)\n"
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" extwl %2,%4,%0\n"
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" mskwl %2,%4,%2\n"
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" or %1,%2,%2\n"
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" stq_c %2,0(%3)\n"
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" beq %2,2f\n"
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
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: "r" ((long)m), "1" (val) : "memory");
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return ret;
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}
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static inline unsigned long
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____xchg_u32(volatile int *m, unsigned long val)
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{
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unsigned long dummy;
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__asm__ __volatile__(
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"1: ldl_l %0,%4\n"
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" bis $31,%3,%1\n"
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" stl_c %1,%2\n"
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" beq %1,2f\n"
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (val), "=&r" (dummy), "=m" (*m)
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: "rI" (val), "m" (*m) : "memory");
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return val;
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}
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static inline unsigned long
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____xchg_u64(volatile long *m, unsigned long val)
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{
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unsigned long dummy;
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__asm__ __volatile__(
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"1: ldq_l %0,%4\n"
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" bis $31,%3,%1\n"
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" stq_c %1,%2\n"
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" beq %1,2f\n"
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (val), "=&r" (dummy), "=m" (*m)
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: "rI" (val), "m" (*m) : "memory");
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return val;
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}
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/* This function doesn't exist, so you'll get a linker error
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if something tries to do an invalid xchg(). */
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extern void __xchg_called_with_bad_pointer(void);
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static __always_inline unsigned long
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____xchg(volatile void *ptr, unsigned long x, int size)
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{
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return
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size == 1 ? ____xchg_u8(ptr, x) :
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size == 2 ? ____xchg_u16(ptr, x) :
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size == 4 ? ____xchg_u32(ptr, x) :
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size == 8 ? ____xchg_u64(ptr, x) :
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(__xchg_called_with_bad_pointer(), x);
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}
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/*
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* Atomic compare and exchange. Compare OLD with MEM, if identical,
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* store NEW in MEM. Return the initial value in MEM. Success is
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* indicated by comparing RETURN with OLD.
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*/
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static inline unsigned long
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____cmpxchg_u8(volatile char *m, unsigned char old, unsigned char new)
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{
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unsigned long prev, tmp, cmp, addr64;
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__asm__ __volatile__(
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" andnot %5,7,%4\n"
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" insbl %1,%5,%1\n"
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"1: ldq_l %2,0(%4)\n"
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" extbl %2,%5,%0\n"
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" cmpeq %0,%6,%3\n"
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" beq %3,2f\n"
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" mskbl %2,%5,%2\n"
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" or %1,%2,%2\n"
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" stq_c %2,0(%4)\n"
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" beq %2,3f\n"
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"2:\n"
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".subsection 2\n"
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"3: br 1b\n"
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".previous"
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: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
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: "r" ((long)m), "Ir" (old), "1" (new) : "memory");
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return prev;
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}
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static inline unsigned long
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____cmpxchg_u16(volatile short *m, unsigned short old, unsigned short new)
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{
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unsigned long prev, tmp, cmp, addr64;
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__asm__ __volatile__(
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" andnot %5,7,%4\n"
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" inswl %1,%5,%1\n"
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"1: ldq_l %2,0(%4)\n"
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" extwl %2,%5,%0\n"
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" cmpeq %0,%6,%3\n"
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" beq %3,2f\n"
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" mskwl %2,%5,%2\n"
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" or %1,%2,%2\n"
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" stq_c %2,0(%4)\n"
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" beq %2,3f\n"
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"2:\n"
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".subsection 2\n"
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"3: br 1b\n"
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".previous"
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: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
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: "r" ((long)m), "Ir" (old), "1" (new) : "memory");
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return prev;
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}
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static inline unsigned long
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____cmpxchg_u32(volatile int *m, int old, int new)
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{
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unsigned long prev, cmp;
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__asm__ __volatile__(
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"1: ldl_l %0,%5\n"
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" cmpeq %0,%3,%1\n"
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" beq %1,2f\n"
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" mov %4,%1\n"
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" stl_c %1,%2\n"
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" beq %1,3f\n"
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"2:\n"
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".subsection 2\n"
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"3: br 1b\n"
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".previous"
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: "=&r"(prev), "=&r"(cmp), "=m"(*m)
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: "r"((long) old), "r"(new), "m"(*m) : "memory");
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return prev;
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}
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static inline unsigned long
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____cmpxchg_u64(volatile long *m, unsigned long old, unsigned long new)
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{
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unsigned long prev, cmp;
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__asm__ __volatile__(
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"1: ldq_l %0,%5\n"
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" cmpeq %0,%3,%1\n"
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" beq %1,2f\n"
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" mov %4,%1\n"
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" stq_c %1,%2\n"
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" beq %1,3f\n"
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"2:\n"
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".subsection 2\n"
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"3: br 1b\n"
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".previous"
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: "=&r"(prev), "=&r"(cmp), "=m"(*m)
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: "r"((long) old), "r"(new), "m"(*m) : "memory");
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return prev;
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}
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/* This function doesn't exist, so you'll get a linker error
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if something tries to do an invalid cmpxchg(). */
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extern void __cmpxchg_called_with_bad_pointer(void);
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static __always_inline unsigned long
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____cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
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int size)
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{
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return
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size == 1 ? ____cmpxchg_u8(ptr, old, new) :
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size == 2 ? ____cmpxchg_u16(ptr, old, new) :
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size == 4 ? ____cmpxchg_u32(ptr, old, new) :
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size == 8 ? ____cmpxchg_u64(ptr, old, new) :
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(__cmpxchg_called_with_bad_pointer(), old);
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}
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#define xchg_local(ptr, x) \
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({ \
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__typeof__(*(ptr)) _x_ = (x); \
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(__typeof__(*(ptr))) __arch_xchg_local((ptr), (unsigned long)_x_,\
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(__typeof__(*(ptr))) ____xchg((ptr), (unsigned long)_x_, \
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sizeof(*(ptr))); \
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})
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@ -21,7 +236,7 @@
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({ \
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__typeof__(*(ptr)) _o_ = (o); \
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__typeof__(*(ptr)) _n_ = (n); \
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(__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_, \
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(__typeof__(*(ptr))) ____cmpxchg((ptr), (unsigned long)_o_, \
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(unsigned long)_n_, \
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sizeof(*(ptr))); \
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})
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@ -32,12 +247,6 @@
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cmpxchg_local((ptr), (o), (n)); \
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})
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#undef ____xchg
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#undef ____cmpxchg
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#define ____xchg(type, args...) __arch_xchg ##type(args)
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#define ____cmpxchg(type, args...) __cmpxchg ##type(args)
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#include <asm/xchg.h>
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/*
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* The leading and the trailing memory barriers guarantee that these
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* operations are fully ordered.
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@ -48,7 +257,7 @@
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__typeof__(*(ptr)) _x_ = (x); \
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smp_mb(); \
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__ret = (__typeof__(*(ptr))) \
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__arch_xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \
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____xchg((ptr), (unsigned long)_x_, sizeof(*(ptr))); \
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smp_mb(); \
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__ret; \
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})
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@ -59,7 +268,7 @@
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__typeof__(*(ptr)) _o_ = (o); \
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__typeof__(*(ptr)) _n_ = (n); \
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smp_mb(); \
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__ret = (__typeof__(*(ptr))) __cmpxchg((ptr), \
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__ret = (__typeof__(*(ptr))) ____cmpxchg((ptr), \
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(unsigned long)_o_, (unsigned long)_n_, sizeof(*(ptr)));\
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smp_mb(); \
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__ret; \
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@ -71,6 +280,4 @@
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arch_cmpxchg((ptr), (o), (n)); \
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})
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#undef ____cmpxchg
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#endif /* _ALPHA_CMPXCHG_H */
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@ -1,246 +0,0 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ALPHA_CMPXCHG_H
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#error Do not include xchg.h directly!
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#else
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/*
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* xchg/xchg_local and cmpxchg/cmpxchg_local share the same code
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* except that local version do not have the expensive memory barrier.
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* So this file is included twice from asm/cmpxchg.h.
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*/
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/*
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* Atomic exchange.
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* Since it can be used to implement critical sections
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* it must clobber "memory" (also for interrupts in UP).
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*/
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static inline unsigned long
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____xchg(_u8, volatile char *m, unsigned long val)
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{
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unsigned long ret, tmp, addr64;
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__asm__ __volatile__(
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" andnot %4,7,%3\n"
|
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" insbl %1,%4,%1\n"
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"1: ldq_l %2,0(%3)\n"
|
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" extbl %2,%4,%0\n"
|
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" mskbl %2,%4,%2\n"
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" or %1,%2,%2\n"
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" stq_c %2,0(%3)\n"
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" beq %2,2f\n"
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
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: "r" ((long)m), "1" (val) : "memory");
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return ret;
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}
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static inline unsigned long
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____xchg(_u16, volatile short *m, unsigned long val)
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{
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unsigned long ret, tmp, addr64;
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__asm__ __volatile__(
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" andnot %4,7,%3\n"
|
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" inswl %1,%4,%1\n"
|
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"1: ldq_l %2,0(%3)\n"
|
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" extwl %2,%4,%0\n"
|
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" mskwl %2,%4,%2\n"
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" or %1,%2,%2\n"
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" stq_c %2,0(%3)\n"
|
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" beq %2,2f\n"
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".subsection 2\n"
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"2: br 1b\n"
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".previous"
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: "=&r" (ret), "=&r" (val), "=&r" (tmp), "=&r" (addr64)
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: "r" ((long)m), "1" (val) : "memory");
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return ret;
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}
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static inline unsigned long
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____xchg(_u32, volatile int *m, unsigned long val)
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{
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unsigned long dummy;
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__asm__ __volatile__(
|
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"1: ldl_l %0,%4\n"
|
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" bis $31,%3,%1\n"
|
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" stl_c %1,%2\n"
|
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" beq %1,2f\n"
|
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".subsection 2\n"
|
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"2: br 1b\n"
|
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".previous"
|
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: "=&r" (val), "=&r" (dummy), "=m" (*m)
|
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: "rI" (val), "m" (*m) : "memory");
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return val;
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}
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|
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static inline unsigned long
|
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____xchg(_u64, volatile long *m, unsigned long val)
|
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{
|
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unsigned long dummy;
|
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|
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__asm__ __volatile__(
|
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"1: ldq_l %0,%4\n"
|
||||
" bis $31,%3,%1\n"
|
||||
" stq_c %1,%2\n"
|
||||
" beq %1,2f\n"
|
||||
".subsection 2\n"
|
||||
"2: br 1b\n"
|
||||
".previous"
|
||||
: "=&r" (val), "=&r" (dummy), "=m" (*m)
|
||||
: "rI" (val), "m" (*m) : "memory");
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
/* This function doesn't exist, so you'll get a linker error
|
||||
if something tries to do an invalid xchg(). */
|
||||
extern void __xchg_called_with_bad_pointer(void);
|
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|
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static __always_inline unsigned long
|
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____xchg(, volatile void *ptr, unsigned long x, int size)
|
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{
|
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switch (size) {
|
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case 1:
|
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return ____xchg(_u8, ptr, x);
|
||||
case 2:
|
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return ____xchg(_u16, ptr, x);
|
||||
case 4:
|
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return ____xchg(_u32, ptr, x);
|
||||
case 8:
|
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return ____xchg(_u64, ptr, x);
|
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}
|
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__xchg_called_with_bad_pointer();
|
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return x;
|
||||
}
|
||||
|
||||
/*
|
||||
* Atomic compare and exchange. Compare OLD with MEM, if identical,
|
||||
* store NEW in MEM. Return the initial value in MEM. Success is
|
||||
* indicated by comparing RETURN with OLD.
|
||||
*/
|
||||
|
||||
static inline unsigned long
|
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____cmpxchg(_u8, volatile char *m, unsigned char old, unsigned char new)
|
||||
{
|
||||
unsigned long prev, tmp, cmp, addr64;
|
||||
|
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__asm__ __volatile__(
|
||||
" andnot %5,7,%4\n"
|
||||
" insbl %1,%5,%1\n"
|
||||
"1: ldq_l %2,0(%4)\n"
|
||||
" extbl %2,%5,%0\n"
|
||||
" cmpeq %0,%6,%3\n"
|
||||
" beq %3,2f\n"
|
||||
" mskbl %2,%5,%2\n"
|
||||
" or %1,%2,%2\n"
|
||||
" stq_c %2,0(%4)\n"
|
||||
" beq %2,3f\n"
|
||||
"2:\n"
|
||||
".subsection 2\n"
|
||||
"3: br 1b\n"
|
||||
".previous"
|
||||
: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
|
||||
: "r" ((long)m), "Ir" (old), "1" (new) : "memory");
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
____cmpxchg(_u16, volatile short *m, unsigned short old, unsigned short new)
|
||||
{
|
||||
unsigned long prev, tmp, cmp, addr64;
|
||||
|
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__asm__ __volatile__(
|
||||
" andnot %5,7,%4\n"
|
||||
" inswl %1,%5,%1\n"
|
||||
"1: ldq_l %2,0(%4)\n"
|
||||
" extwl %2,%5,%0\n"
|
||||
" cmpeq %0,%6,%3\n"
|
||||
" beq %3,2f\n"
|
||||
" mskwl %2,%5,%2\n"
|
||||
" or %1,%2,%2\n"
|
||||
" stq_c %2,0(%4)\n"
|
||||
" beq %2,3f\n"
|
||||
"2:\n"
|
||||
".subsection 2\n"
|
||||
"3: br 1b\n"
|
||||
".previous"
|
||||
: "=&r" (prev), "=&r" (new), "=&r" (tmp), "=&r" (cmp), "=&r" (addr64)
|
||||
: "r" ((long)m), "Ir" (old), "1" (new) : "memory");
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
____cmpxchg(_u32, volatile int *m, int old, int new)
|
||||
{
|
||||
unsigned long prev, cmp;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: ldl_l %0,%5\n"
|
||||
" cmpeq %0,%3,%1\n"
|
||||
" beq %1,2f\n"
|
||||
" mov %4,%1\n"
|
||||
" stl_c %1,%2\n"
|
||||
" beq %1,3f\n"
|
||||
"2:\n"
|
||||
".subsection 2\n"
|
||||
"3: br 1b\n"
|
||||
".previous"
|
||||
: "=&r"(prev), "=&r"(cmp), "=m"(*m)
|
||||
: "r"((long) old), "r"(new), "m"(*m) : "memory");
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
static inline unsigned long
|
||||
____cmpxchg(_u64, volatile long *m, unsigned long old, unsigned long new)
|
||||
{
|
||||
unsigned long prev, cmp;
|
||||
|
||||
__asm__ __volatile__(
|
||||
"1: ldq_l %0,%5\n"
|
||||
" cmpeq %0,%3,%1\n"
|
||||
" beq %1,2f\n"
|
||||
" mov %4,%1\n"
|
||||
" stq_c %1,%2\n"
|
||||
" beq %1,3f\n"
|
||||
"2:\n"
|
||||
".subsection 2\n"
|
||||
"3: br 1b\n"
|
||||
".previous"
|
||||
: "=&r"(prev), "=&r"(cmp), "=m"(*m)
|
||||
: "r"((long) old), "r"(new), "m"(*m) : "memory");
|
||||
|
||||
return prev;
|
||||
}
|
||||
|
||||
/* This function doesn't exist, so you'll get a linker error
|
||||
if something tries to do an invalid cmpxchg(). */
|
||||
extern void __cmpxchg_called_with_bad_pointer(void);
|
||||
|
||||
static __always_inline unsigned long
|
||||
____cmpxchg(, volatile void *ptr, unsigned long old, unsigned long new,
|
||||
int size)
|
||||
{
|
||||
switch (size) {
|
||||
case 1:
|
||||
return ____cmpxchg(_u8, ptr, old, new);
|
||||
case 2:
|
||||
return ____cmpxchg(_u16, ptr, old, new);
|
||||
case 4:
|
||||
return ____cmpxchg(_u32, ptr, old, new);
|
||||
case 8:
|
||||
return ____cmpxchg(_u64, ptr, old, new);
|
||||
}
|
||||
__cmpxchg_called_with_bad_pointer();
|
||||
return old;
|
||||
}
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user