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perf/x86/intel/bts: Kill a silly warning

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At the moment, intel_bts will WARN() out if there is more than one
event writing to the same ring buffer, via SET_OUTPUT, and will only
send data from one event to a buffer.

There is no reason to have this warning in, so kill it.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: vince@deater.net
Link: http://lkml.kernel.org/r/20160906132353.19887-6-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Alexander Shishkin 2016-09-06 16:23:53 +03:00 committed by Ingo Molnar
parent 4d4c474124
commit ef9ef3befa
1 changed files with 0 additions and 2 deletions
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2
arch/x86/events/intel/bts.c
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@ -378,8 +378,6 @@ bts_buffer_reset(struct bts_buffer *buf, struct perf_output_handle *handle)
return 0; return 0;
head = handle->head & ((buf->nr_pages << PAGE_SHIFT) - 1); head = handle->head & ((buf->nr_pages << PAGE_SHIFT) - 1);
if (WARN_ON_ONCE(head != local_read(&buf->head)))
return -EINVAL;
phys = &buf->buf[buf->cur_buf]; phys = &buf->buf[buf->cur_buf];
space = phys->offset + phys->displacement + phys->size - head; space = phys->offset + phys->displacement + phys->size - head;