linux-kernel - [PATCH 20/24] x86/oprofile: op_model_athlon.c: Fix counter reset when reenabling IBS OP

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Message-ID: <1216753748-11261-21-git-send-email-robert.richter@amd.com>
Date:	Tue, 22 Jul 2008 21:09:04 +0200
From:	Robert Richter <robert.richter@....com>
To:	Barry Kasindorf <barry.kasindorf@....com>,
	Ingo Molnar <mingo@...e.hu>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	oprofile-list <oprofile-list@...ts.sourceforge.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Robert Richter <robert.richter@....com>
Subject: [PATCH 20/24] x86/oprofile: op_model_athlon.c: Fix counter reset when reenabling IBS OP

Signed-off-by: Robert Richter <robert.richter@....com>
---
 arch/x86/oprofile/op_model_athlon.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/oprofile/op_model_athlon.c b/arch/x86/oprofile/op_model_athlon.c
index a3a2058..9c8c8c5 100644
--- a/arch/x86/oprofile/op_model_athlon.c
+++ b/arch/x86/oprofile/op_model_athlon.c
@@ -251,6 +251,7 @@ op_amd_handle_ibs(struct pt_regs * const regs,
 						(unsigned int *)&ibs_op,
 						IBS_OP_BEGIN);
 			rdmsr(MSR_AMD64_IBSOPCTL, low, high);
+			high = 0;
 			low &= ~IBS_OP_LOW_VALID_BIT;
 			low |= IBS_OP_LOW_ENABLE;
 			wrmsr(MSR_AMD64_IBSOPCTL, low, high);
-- 
1.5.5.4


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