Release 4.7 include/asm-generic/cmpxchg-local.h

#ifndef __ASM_GENERIC_CMPXCHG_LOCAL_H

#define __ASM_GENERIC_CMPXCHG_LOCAL_H

#include <linux/types.h>
#include <linux/irqflags.h>

extern unsigned long wrong_size_cmpxchg(volatile void *ptr)
	__noreturn;

/*
 * Generic version of __cmpxchg_local (disables interrupts). Takes an unsigned
 * long parameter, supporting various types of architectures.
 */


static inline unsigned long __cmpxchg_local_generic(volatile void *ptr,
		unsigned long old, unsigned long new, int size)
{
	unsigned long flags, prev;

	/*
         * Sanity checking, compile-time.
         */
	if (size == 8 && sizeof(unsigned long) != 8)
		wrong_size_cmpxchg(ptr);

	raw_local_irq_save(flags);
	switch (size) {
	case 1: prev = *(u8 *)ptr;
		if (prev == old)
			*(u8 *)ptr = (u8)new;
		break;
	case 2: prev = *(u16 *)ptr;
		if (prev == old)
			*(u16 *)ptr = (u16)new;
		break;
	case 4: prev = *(u32 *)ptr;
		if (prev == old)
			*(u32 *)ptr = (u32)new;
		break;
	case 8: prev = *(u64 *)ptr;
		if (prev == old)
			*(u64 *)ptr = (u64)new;
		break;
	default:
		wrong_size_cmpxchg(ptr);
	}
	raw_local_irq_restore(flags);
	return prev;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
mathieu desnoyers
mathieu desnoyers
197
98.99%
1
50.00%
ingo molnar
ingo molnar
2
1.01%
1
50.00%
Total
199
100.00%
2
100.00%

/*
 * Generic version of __cmpxchg64_local. Takes an u64 parameter.
 */


static inline u64 __cmpxchg64_local_generic(volatile void *ptr,
		u64 old, u64 new)
{
	u64 prev;
	unsigned long flags;

	raw_local_irq_save(flags);
	prev = *(u64 *)ptr;
	if (prev == old)
		*(u64 *)ptr = new;
	raw_local_irq_restore(flags);
	return prev;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
mathieu desnoyers
mathieu desnoyers
60
96.77%
1
50.00%
ingo molnar
ingo molnar
2
3.23%
1
50.00%
Total
62
100.00%
2
100.00%

#endif
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
mathieu desnoyers
mathieu desnoyers
277
95.85%
1
25.00%
behan webster
behan webster
5
1.73%
1
25.00%
ingo molnar
ingo molnar
4
1.38%
1
25.00%
david howells
david howells
3
1.04%
1
25.00%
Total
289
100.00%
4
100.00%
  
Directory: include/asm-generic

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.