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68 lines
1.4 KiB
68 lines
1.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ASM_GENERIC_CMPXCHG_LOCAL_H |
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#define __ASM_GENERIC_CMPXCHG_LOCAL_H |
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#include <linux/types.h> |
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#include <linux/irqflags.h> |
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extern unsigned long wrong_size_cmpxchg(volatile void *ptr) |
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__noreturn; |
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/* |
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* Generic version of __cmpxchg_local (disables interrupts). Takes an unsigned |
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* long parameter, supporting various types of architectures. |
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*/ |
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static inline unsigned long __cmpxchg_local_generic(volatile void *ptr, |
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unsigned long old, unsigned long new, int size) |
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{ |
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unsigned long flags, prev; |
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/* |
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* Sanity checking, compile-time. |
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*/ |
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if (size == 8 && sizeof(unsigned long) != 8) |
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wrong_size_cmpxchg(ptr); |
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raw_local_irq_save(flags); |
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switch (size) { |
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case 1: prev = *(u8 *)ptr; |
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if (prev == old) |
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*(u8 *)ptr = (u8)new; |
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break; |
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case 2: prev = *(u16 *)ptr; |
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if (prev == old) |
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*(u16 *)ptr = (u16)new; |
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break; |
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case 4: prev = *(u32 *)ptr; |
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if (prev == old) |
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*(u32 *)ptr = (u32)new; |
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break; |
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case 8: prev = *(u64 *)ptr; |
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if (prev == old) |
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*(u64 *)ptr = (u64)new; |
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break; |
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default: |
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wrong_size_cmpxchg(ptr); |
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} |
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raw_local_irq_restore(flags); |
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return prev; |
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} |
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/* |
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* Generic version of __cmpxchg64_local. Takes an u64 parameter. |
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*/ |
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static inline u64 __cmpxchg64_local_generic(volatile void *ptr, |
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u64 old, u64 new) |
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{ |
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u64 prev; |
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unsigned long flags; |
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raw_local_irq_save(flags); |
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prev = *(u64 *)ptr; |
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if (prev == old) |
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*(u64 *)ptr = new; |
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raw_local_irq_restore(flags); |
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return prev; |
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} |
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#endif
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