linux-kernel - Re: [RFC patch 02/21] LTTng Kernel Trace Thread Flag ARM fix syscall exit

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Message-ID: <20090315193548.GA10601@Krystal>
Date:	Sun, 15 Mar 2009 15:35:48 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC patch 02/21] LTTng Kernel Trace Thread Flag ARM fix
	syscall exit

(sorry, forgot to pick this one from my tree in the original post)

Make sure we re-test the kernel trace thread flag at syscall exit even if we
were not tracing at syscall entry. This fixes syscall exit tracing early in the
trace.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
---
 arch/arm/kernel/entry-common.S |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-omap-2.6/arch/arm/kernel/entry-common.S
===================================================================
--- linux-omap-2.6.orig/arch/arm/kernel/entry-common.S	2009-02-21 16:31:10.000000000 +0000
+++ linux-omap-2.6/arch/arm/kernel/entry-common.S	2009-02-21 16:32:18.000000000 +0000
@@ -43,6 +43,8 @@
  * Ok, we need to do extra processing, enter the slow path.
  */
 fast_work_pending:
+	tst	r1, #_TIF_KERNEL_TRACE		@ flag can be set asynchronously
+	bne	__sys_trace_return
 	str	r0, [sp, #S_R0+S_OFF]!		@ returned r0
 work_pending:
 	tst	r1, #_TIF_NEED_RESCHED

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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