linux-kernel - [GIT PULL] perf fix

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Message-ID: <YNQt1LsJCi2C0Aa5@gmail.com>
Date:   Thu, 24 Jun 2021 09:01:40 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL] perf fix

Linus,

Please pull the latest perf/urgent git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf-urgent-2021-06-24

   # HEAD: 7f049fbdd57f6ea71dc741d903c19c73b2f70950 perf/x86/intel/lbr: Zero the xstate buffer on allocation

An LBR buffer fix for code that probably only worked accidentally.

 Thanks,

	Ingo

------------------>
Thomas Gleixner (1):
      perf/x86/intel/lbr: Zero the xstate buffer on allocation


 arch/x86/events/intel/lbr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index 4409d2cccfda..e8453de7a964 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -731,7 +731,8 @@ void reserve_lbr_buffers(void)
 		if (!kmem_cache || cpuc->lbr_xsave)
 			continue;
 
-		cpuc->lbr_xsave = kmem_cache_alloc_node(kmem_cache, GFP_KERNEL,
+		cpuc->lbr_xsave = kmem_cache_alloc_node(kmem_cache,
+							GFP_KERNEL | __GFP_ZERO,
 							cpu_to_node(cpu));
 	}
 }