#ifndef _ASM_GENERIC_LOCAL_H
#define _ASM_GENERIC_LOCAL_H

#include <linux/percpu.h>
#include <linux/atomic.h>
#include <asm/types.h>

/*
 * A signed long type for operations which are atomic for a single CPU.
 * Usually used in combination with per-cpu variables.
 *
 * This is the default implementation, which uses atomic_long_t.  Which is
 * rather pointless.  The whole point behind local_t is that some processors
 * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs
 * running on this CPU.  local_t allows exploitation of such capabilities.
 */

/* Implement in terms of atomics. */

/* Don't use typedef: don't want them to be mixed with atomic_t's. */
typedef struct
{
	atomic_long_t a;
} local_t;

#define LOCAL_INIT(i)	{ ATOMIC_LONG_INIT(i) }

#define local_read(l)	atomic_long_read(&(l)->a)
#define local_set(l,i)	atomic_long_set((&(l)->a),(i))
#define local_inc(l)	atomic_long_inc(&(l)->a)
#define local_dec(l)	atomic_long_dec(&(l)->a)
#define local_add(i,l)	atomic_long_add((i),(&(l)->a))
#define local_sub(i,l)	atomic_long_sub((i),(&(l)->a))

#define local_sub_and_test(i, l) atomic_long_sub_and_test((i), (&(l)->a))
#define local_dec_and_test(l) atomic_long_dec_and_test(&(l)->a)
#define local_inc_and_test(l) atomic_long_inc_and_test(&(l)->a)
#define local_add_negative(i, l) atomic_long_add_negative((i), (&(l)->a))
#define local_add_return(i, l) atomic_long_add_return((i), (&(l)->a))
#define local_sub_return(i, l) atomic_long_sub_return((i), (&(l)->a))
#define local_inc_return(l) atomic_long_inc_return(&(l)->a)

#define local_cmpxchg(l, o, n) atomic_long_cmpxchg((&(l)->a), (o), (n))
#define local_xchg(l, n) atomic_long_xchg((&(l)->a), (n))
#define local_add_unless(l, _a, u) atomic_long_add_unless((&(l)->a), (_a), (u))
#define local_inc_not_zero(l) atomic_long_inc_not_zero(&(l)->a)

/* Non-atomic variants, ie. preemption disabled and won't be touched
 * in interrupt, etc.  Some archs can optimize this case well. */
#define __local_inc(l)		local_set((l), local_read(l) + 1)
#define __local_dec(l)		local_set((l), local_read(l) - 1)
#define __local_add(i,l)	local_set((l), local_read(l) + (i))
#define __local_sub(i,l)	local_set((l), local_read(l) - (i))

#endif /* _ASM_GENERIC_LOCAL_H */
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>Documentation</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='0933840acf7b65d6d30a5b6089d882afea57aca3'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Jiri Olsa &lt;jolsa@redhat.com&gt;</td><td class='right'>2016-10-20 13:10:11 +0200</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2016-10-28 11:06:25 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>0933840acf7b65d6d30a5b6089d882afea57aca3</a> (<a href='/cgit.cgi/linux/net-next.git/patch/Documentation?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>d70660c9cc59695decc9860a0446d4dd476feeac</a> /<a href='/cgit.cgi/linux/net-next.git/tree/Documentation?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>Documentation</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/Documentation?id=889882bce2a5f69242c1f3acd840983f467499b9'>889882bce2a5f69242c1f3acd840983f467499b9</a> (<a href='/cgit.cgi/linux/net-next.git/diff/Documentation?id=0933840acf7b65d6d30a5b6089d882afea57aca3&amp;id2=889882bce2a5f69242c1f3acd840983f467499b9'>diff</a>)</td></tr></table>
<div class='commit-subject'>perf/core: Protect PMU device removal with a 'pmu_bus_running' check, to fix CONFIG_DEBUG_TEST_DRIVER_REMOVE=y kernel panic</div><div class='commit-msg'>CAI Qian reported a crash in the PMU uncore device removal code,
enabled by the CONFIG_DEBUG_TEST_DRIVER_REMOVE=y option:

  https://marc.info/?l=linux-kernel&amp;m=147688837328451

The reason for the crash is that perf_pmu_unregister() tries to remove
a PMU device which is not added at this point. We add PMU devices
only after pmu_bus is registered, which happens in the
perf_event_sysfs_init() call and sets the 'pmu_bus_running' flag.

The fix is to get the 'pmu_bus_running' flag state at the point
the PMU is taken out of the PMU list and remove the device
later only if it's set.

Reported-by: CAI Qian &lt;caiqian@redhat.com&gt;
Tested-by: CAI Qian &lt;caiqian@redhat.com&gt;
Signed-off-by: Jiri Olsa &lt;jolsa@kernel.org&gt;
Signed-off-by: Peter Zijlstra (Intel) &lt;peterz@infradead.org&gt;
Cc: Alexander Shishkin &lt;alexander.shishkin@linux.intel.com&gt;
Cc: Arnaldo Carvalho de Melo &lt;acme@redhat.com&gt;
Cc: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;
Cc: Jiri Olsa &lt;jolsa@redhat.com&gt;
Cc: Kan Liang &lt;kan.liang@intel.com&gt;
Cc: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Rob Herring &lt;robh@kernel.org&gt;
Cc: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Link: http://lkml.kernel.org/r/20161020111011.GA13361@krava
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=0933840acf7b65d6d30a5b6089d882afea57aca3'>Diffstat</a> (limited to 'Documentation')</div><table summary='diffstat' class='diffstat'>