Patch "perf/x86: fix PEBS issues on Intel Atom/Core2" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

perf/x86: fix PEBS issues on Intel Atom/Core2

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
perf-x86-fix-pebs-issues-on-intel-atom-core2.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Stephane Eranian <[email protected]>
Date: Thu, 3 Dec 2015 23:33:18 +0100
Subject: perf/x86: fix PEBS issues on Intel Atom/Core2

From: Stephane Eranian <[email protected]>

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.

---
 arch/x86/kernel/cpu/perf_event_intel_ds.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

@@ -1110,6 +1110,13 @@ get_next_pebs_record_by_bit(void *base,
 	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;
 

@@ -1195,7 +1202,7 @@ static void intel_pmu_drain_pebs_core(st
 	if (!event->attr.precise_ip)
 		return;
 
-	n = (top - at) / x86_pmu.pebs_record_size;
+	n = top - at;
 	if (n <= 0)
 		return;
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/perf-x86-fix-pebs-issues-on-intel-atom-core2.patch