Patch "perf/x86/intel: Don't accidentally clear high bits in bdw_limit_period()" 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/intel: Don't accidentally clear high bits in bdw_limit_period()

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-intel-don-t-accidentally-clear-high-bits-in-bdw_limit_period.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: Dan Carpenter <[email protected]>
Date: Sat, 17 Mar 2018 14:52:16 +0300
Subject: perf/x86/intel: Don't accidentally clear high bits in bdw_limit_period()

From: Dan Carpenter <[email protected]>

commit e5ea9b54a055619160bbfe527ebb7d7191823d66 upstream.

We intended to clear the lowest 6 bits but because of a type bug we clear the high 32 bits as well. Andi says that periods are rarely more than U32_MAX so this bug probably doesn't have a huge runtime impact.

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

@@ -2716,7 +2716,7 @@ static unsigned bdw_limit_period(struct
 			X86_CONFIG(.event=0xc0, .umask=0x01)) {
 		if (left < 128)
 			left = 128;
-		left &= ~0x3fu;
+		left &= ~0x3fULL;
 	}
 	return left;
 }

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

queue-4.4/perf-x86-intel-don-t-accidentally-clear-high-bits-in-bdw_limit_period.patch queue-4.4/staging-ncpfs-memory-corruption-in-ncp_read_kernel.patch