068550631f
Decrease the probability of this internal facility to be used by driver code. Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k] Acked-by: Palmer Dabbelt <palmer@rivosinc.com> [riscv] Link: https://lore.kernel.org/r/20230118154450.73842-1-andrzej.hajda@intel.com Cc: Linus Torvalds <torvalds@linux-foundation.org>
74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SH_CMPXCHG_H
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#define __ASM_SH_CMPXCHG_H
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/*
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* Atomic operations that C can't guarantee us. Useful for
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* resource counting etc..
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*/
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#include <linux/compiler.h>
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#include <linux/types.h>
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#if defined(CONFIG_GUSA_RB)
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#include <asm/cmpxchg-grb.h>
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#elif defined(CONFIG_CPU_SH4A)
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#include <asm/cmpxchg-llsc.h>
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#elif defined(CONFIG_CPU_J2) && defined(CONFIG_SMP)
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#include <asm/cmpxchg-cas.h>
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#else
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#include <asm/cmpxchg-irq.h>
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#endif
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extern void __xchg_called_with_bad_pointer(void);
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#define __arch_xchg(ptr, x, size) \
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({ \
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unsigned long __xchg__res; \
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volatile void *__xchg_ptr = (ptr); \
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switch (size) { \
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case 4: \
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__xchg__res = xchg_u32(__xchg_ptr, x); \
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break; \
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case 2: \
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__xchg__res = xchg_u16(__xchg_ptr, x); \
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break; \
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case 1: \
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__xchg__res = xchg_u8(__xchg_ptr, x); \
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break; \
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default: \
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__xchg_called_with_bad_pointer(); \
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__xchg__res = x; \
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break; \
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} \
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\
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__xchg__res; \
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})
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#define arch_xchg(ptr,x) \
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((__typeof__(*(ptr)))__arch_xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
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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 inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
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unsigned long new, int size)
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{
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switch (size) {
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case 4:
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return __cmpxchg_u32(ptr, old, new);
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}
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__cmpxchg_called_with_bad_pointer();
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return old;
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}
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#define arch_cmpxchg(ptr,o,n) \
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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((ptr), (unsigned long)_o_, \
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(unsigned long)_n_, sizeof(*(ptr))); \
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})
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#endif /* __ASM_SH_CMPXCHG_H */
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