From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp05.au.ibm.com (e23smtp05.au.ibm.com [202.81.31.147]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e23smtp05.au.ibm.com", Issuer "GeoTrust SSL CA" (not verified)) by ozlabs.org (Postfix) with ESMTPS id D522D2C00E5 for ; Mon, 6 May 2013 19:51:47 +1000 (EST) Received: from /spool/local by e23smtp05.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 6 May 2013 19:32:11 +1000 Received: from d23relay04.au.ibm.com (d23relay04.au.ibm.com [9.190.234.120]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id 640372CE9761 for ; Mon, 6 May 2013 17:00:12 +1000 (EST) Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.235.139]) by d23relay04.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r466kMbH12386422 for ; Mon, 6 May 2013 16:46:23 +1000 Received: from d23av04.au.ibm.com (loopback [127.0.0.1]) by d23av04.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r4670A9q015923 for ; Mon, 6 May 2013 17:00:11 +1000 From: Anshuman Khandual To: linuxppc-dev@ozlabs.org Subject: [PATCH] powerpc, perf: Clear out branch entries to avoid any previous stale values Date: Mon, 6 May 2013 12:29:48 +0530 Message-Id: <1367823588-28871-1-git-send-email-khandual@linux.vnet.ibm.com> Cc: mikey@neuling.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , The 'to' field inside branch entries might contain stale values from previous PMU interrupt instances which had indirect branches. So clear all the values before reading a fresh set of BHRB entries after a PMU interrupt. Signed-off-by: Anshuman Khandual --- arch/powerpc/perf/core-book3s.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c index c627843..09db68d 100644 --- a/arch/powerpc/perf/core-book3s.c +++ b/arch/powerpc/perf/core-book3s.c @@ -1590,6 +1590,8 @@ static void record_and_restart(struct perf_event *event, unsigned long val, if (event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK) { struct cpu_hw_events *cpuhw; cpuhw = &__get_cpu_var(cpu_hw_events); + memset(cpuhw->bhrb_entries, 0, + sizeof(struct perf_branch_entry) * BHRB_MAX_ENTRIES); power_pmu_bhrb_read(cpuhw); data.br_stack = &cpuhw->bhrb_stack; } -- 1.7.11.7