#ifndef _TOOLS_LINUX_ASM_X86_ATOMIC_H
#define _TOOLS_LINUX_ASM_X86_ATOMIC_H

#include <linux/compiler.h>
#include <linux/types.h>
#include "rmwcc.h"

#define LOCK_PREFIX "\n\tlock; "

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 */

#define ATOMIC_INIT(i)	{ (i) }

/**
 * atomic_read - read atomic variable
 * @v: pointer of type atomic_t
 *
 * Atomically reads the value of @v.
 */
static inline int atomic_read(const atomic_t *v)
{
	return ACCESS_ONCE((v)->counter);
}

/**
 * atomic_set - set atomic variable
 * @v: pointer of type atomic_t
 * @i: required value
 *
 * Atomically sets the value of @v to @i.
 */
static inline void atomic_set(atomic_t *v, int i)
{
	v->counter = i;
}

/**
 * atomic_inc - increment atomic variable
 * @v: pointer of type atomic_t
 *
 * Atomically increments @v by 1.
 */
static inline void atomic_inc(atomic_t *v)
{
	asm volatile(LOCK_PREFIX "incl %0"
		     : "+m" (v->counter));
}

/**
 * atomic_dec_and_test - decrement and test
 * @v: pointer of type atomic_t
 *
 * Atomically decrements @v by 1 and
 * returns true if the result is 0, or false for all other
 * cases.
 */
static inline int atomic_dec_and_test(atomic_t *v)
{
	GEN_UNARY_RMWcc(LOCK_PREFIX "decl", v->counter, "%0", "e");
}

#endif /* _TOOLS_LINUX_ASM_X86_ATOMIC_H */
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<tr><th>author</th><td>Sebastian Andrzej Siewior &lt;bigeasy@linutronix.de&gt;</td><td class='right'>2016-11-03 15:50:08 +0100</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2016-11-09 23:45:29 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=7cc277b489b4fe91f42eb596b282879c2d13152e'>7cc277b489b4fe91f42eb596b282879c2d13152e</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=7cc277b489b4fe91f42eb596b282879c2d13152e'>patch</a>)</td></tr>
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<div class='commit-subject'>drivers base/cacheinfo: Convert to hotplug state machine</div><div class='commit-msg'>Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs. No functional change.

Signed-off-by: Sebastian Andrzej Siewior &lt;bigeasy@linutronix.de&gt;
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Cc: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20161103145021.28528-13-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

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