Patch "perf/x86: Fix undefined shift on 32-bit kernels" 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 undefined shift on 32-bit kernels

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-undefined-shift-on-32-bit-kernels.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: Andrey Ryabinin <[email protected]>
Date: Wed, 11 May 2016 16:51:51 +0300
Subject: perf/x86: Fix undefined shift on 32-bit kernels

From: Andrey Ryabinin <[email protected]>

commit 6d6f2833bfbf296101f9f085e10488aef2601ba5 upstream.

Jim reported:

	UBSAN: Undefined behaviour in arch/x86/events/intel/core.c:3708:12
	shift exponent 35 is too large for 32-bit type 'long unsigned int'

The use of 'unsigned long' type obviously is not correct here, make it 'unsigned long long' instead.

---
 arch/x86/kernel/cpu/perf_event_intel.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -3601,7 +3601,7 @@ __init int intel_pmu_init(void)
 				c->idxmsk64 |= (1ULL << x86_pmu.num_counters) - 1;
 			}
 			c->idxmsk64 &=
-				~(~0UL << (INTEL_PMC_IDX_FIXED + x86_pmu.num_counters_fixed));
+				~(~0ULL << (INTEL_PMC_IDX_FIXED + x86_pmu.num_counters_fixed));
 			c->weight = hweight64(c->idxmsk64);
 		}
 	}

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

queue-4.4/perf-x86-fix-undefined-shift-on-32-bit-kernels.patch queue-4.4/sched-fair-fix-cfs_rq-avg-tracking-underflow.patch