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Commit 1b6de591 authored by Alexander Shishkin's avatar Alexander Shishkin Committed by Ingo Molnar
Browse files

perf/x86/intel/pt: Convert ACCESS_ONCE()s 



This patch converts remaining ACCESS_ONCE() instances into READ_ONCE()
and WRITE_ONCE() as appropriate.

Signed-off-by: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: vince@deater.net
Link: http://lkml.kernel.org/r/1461857746-31346-2-git-send-email-alexander.shishkin@linux.intel.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 65c7e6f1

arch/x86/events/intel/pt.c

+3 −3
Original line number Diff line number Diff line
@@ -1135,7 +1135,7 @@ void intel_pt_interrupt(void) 
	 * after PT has been disabled by pt_event_stop(). Make sure we don't

	 * do anything (particularly, re-enable) for this event here.

	 */

	if (!ACCESS_ONCE(pt->handle_nmi))

	if (!READ_ONCE(pt->handle_nmi))

		return;



	/*
@@ -1237,7 +1237,7 @@ static void pt_event_start(struct perf_event *event, int mode) 
			goto fail_end_stop;

	}



	ACCESS_ONCE(pt->handle_nmi) = 1;

	WRITE_ONCE(pt->handle_nmi, 1);

	hwc->state = 0;



	pt_config_buffer(buf->cur->table, buf->cur_idx,
@@ -1260,7 +1260,7 @@ static void pt_event_stop(struct perf_event *event, int mode) 
	 * Protect against the PMI racing with disabling wrmsr,

	 * see comment in intel_pt_interrupt().

	 */

	ACCESS_ONCE(pt->handle_nmi) = 0;

	WRITE_ONCE(pt->handle_nmi, 0);



	pt_config_stop(event);