From: Will Deacon <will.deacon@arm.com>
Date: Thu, 16 Aug 2012 17:14:14 +0000 (+0100)
Subject: tracing/syscalls: Fix perf syscall tracing when syscall_nr == -1
X-Git-Tag: v3.2.65~64
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6f25b4e75a87fea8087b543f3d1298d301d24ad7;p=pandora-kernel.git

tracing/syscalls: Fix perf syscall tracing when syscall_nr == -1

commit 60916a9382e88fbf5e54fd36a3e658efd7ab7bed upstream.

syscall_get_nr can return -1 in the case that the task is not executing
a system call.

This patch fixes perf_syscall_{enter,exit} to check that the syscall
number is valid before using it as an index into a bitmap.

Link: http://lkml.kernel.org/r/1345137254-7377-1-git-send-email-will.deacon@arm.com

Cc: Jason Baron <jbaron@redhat.com>
Cc: Wade Farnsworth <wade_farnsworth@mentor.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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