From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965815AbbJ1NMK (ORCPT ); Wed, 28 Oct 2015 09:12:10 -0400 Received: from mail-wi0-f171.google.com ([209.85.212.171]:33374 "EHLO mail-wi0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965683AbbJ1NME (ORCPT ); Wed, 28 Oct 2015 09:12:04 -0400 From: Daniel Lezcano To: tglx@linutronix.de Cc: Jisheng Zhang , linux-kernel@vger.kernel.org (open list:CLOCKSOURCE, CLOC...) Subject: [PATCH 5/8] clocksource/drivers/vf_pit_timer: Prevent ftrace recursion Date: Wed, 28 Oct 2015 14:11:30 +0100 Message-Id: <1446037894-22601-5-git-send-email-daniel.lezcano@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1446037894-22601-1-git-send-email-daniel.lezcano@linaro.org> References: <5630C947.4020706@linaro.org> <1446037894-22601-1-git-send-email-daniel.lezcano@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jisheng Zhang Having a traceable function in the sched_clock() path leads to a recursion within ftrace and a kernel crash. We should not trace the pit_read_sched_clock() function. Fix this by adding a notrace attribute to this function. Signed-off-by: Jisheng Zhang Signed-off-by: Daniel Lezcano --- drivers/clocksource/vf_pit_timer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/clocksource/vf_pit_timer.c b/drivers/clocksource/vf_pit_timer.c index f07ba99..a0e6c68 100644 --- a/drivers/clocksource/vf_pit_timer.c +++ b/drivers/clocksource/vf_pit_timer.c @@ -52,7 +52,7 @@ static inline void pit_irq_acknowledge(void) __raw_writel(PITTFLG_TIF, clkevt_base + PITTFLG); } -static u64 pit_read_sched_clock(void) +static u64 notrace pit_read_sched_clock(void) { return ~__raw_readl(clksrc_base + PITCVAL); } -- 1.9.1