linux-kernel - [PATCH] perf/x86/amd: Explicitly define PERF_COUNT_HW_REF_CPU

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Date:	Wed, 27 Apr 2016 03:19:53 +0200
From:	Adam Borowski <kilobyte@...band.pl>
To:	linux-kernel@...r.kernel.org,
	Stephane Eranian <eranian@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Borislav Petkov <bp@...e.de>
Cc:	Adam Borowski <kilobyte@...band.pl>
Subject: [PATCH] perf/x86/amd: Explicitly define PERF_COUNT_HW_REF_CPU_CYCLES as undefined.

filter_events() relies on the value of 0 to remove events that are not
applicable, like this one.

UBSAN: Undefined behaviour in arch/x86/events/amd/core.c:132:30
index 9 is out of range for type 'u64 [9]'
UBSAN: Undefined behaviour in arch/x86/events/amd/core.c:132:9
load of address ffffffff81c021c8 with insufficient space
for an object of type 'const u64'

Signed-off-by: Adam Borowski <kilobyte@...band.pl>
---
 arch/x86/events/amd/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index 86a9bec..5fa1b8e 100644
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -125,6 +125,7 @@ static const u64 amd_perfmon_event_map[] =
   [PERF_COUNT_HW_BRANCH_MISSES]			= 0x00c3,
   [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND]	= 0x00d0, /* "Decoder empty" event */
   [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]	= 0x00d1, /* "Dispatch stalls" event */
+  [PERF_COUNT_HW_REF_CPU_CYCLES]		=      0,
 };
 
 static u64 amd_pmu_event_map(int hw_event)
-- 
2.8.1