4.2.8-ckt3 -stable review patch. If anyone has any objections, please let me
know.
---8<------------------------------------------------------------
From: Stephane Eranian <eran...@google.com>
commit 1424a09a9e1839285e948d4ea9fdfca26c9a2086 upstream.
This patch fixes broken PEBS support on Intel Atom and Core2
due to wrong pointer arithmetic in intel_pmu_drain_pebs_core().
The get_next_pebs_record_by_bit() was called on PEBS format fmt0
which does not use the pebs_record_nhm layout.
Signed-off-by: Stephane Eranian <eran...@google.com>
Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Vince Weaver <vincent.wea...@maine.edu>
Cc: kan.li...@intel.com
Fixes: 21509084f999 ("perf/x86/intel: Handle multiple records in the PEBS
buffer")
Link:
http://lkml.kernel.org/r/1449182000-31524-3-git-send-email-eran...@google.com
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
arch/x86/kernel/cpu/perf_event_intel_ds.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c
b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 71fc402..dbe8d89 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -1027,6 +1027,13 @@ get_next_pebs_record_by_bit(void *base, void *top, int
bit)
void *at;
u64 pebs_status;
+ /*
+ * fmt0 does not have a status bitfield (does not use
+ * perf_record_nhm format)
+ */
+ if (x86_pmu.intel_cap.pebs_format < 1)
+ return base;
+
if (base == NULL)
return NULL;
@@ -1112,7 +1119,7 @@ static void intel_pmu_drain_pebs_core(struct pt_regs
*iregs)
if (!event->attr.precise_ip)
return;
- n = (top - at) / x86_pmu.pebs_record_size;
+ n = top - at;
if (n <= 0)
return;
--
1.9.1
