Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755559Ab1BCD2D (ORCPT ); Wed, 2 Feb 2011 22:28:03 -0500 Received: from e23smtp04.au.ibm.com ([202.81.31.146]:46624 "EHLO e23smtp04.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754792Ab1BCD1t (ORCPT ); Wed, 2 Feb 2011 22:27:49 -0500 From: "Ian Munsie" To: linux-kernel@vger.kernel.org Cc: Andreas Dilger , Dave Kleikamp , Andrew Morton , Jiri Kosina , Jason Baron , linuxppc-dev , Steven Rostedt , Alexander Graf , Ingo Molnar , Paul Mackerras , KOSAKI Motohiro , Frederic Weisbecker , Scott Wood , Nathan Lynch , Avantika Mathur , David Gibson , Andreas Schwab , Namhyung Kim , Ian Munsie Subject: [PATCH 6/6] ftrace syscalls: Early terminate search for sys_ni_syscall Date: Thu, 3 Feb 2011 14:27:25 +1100 Message-Id: <1296703645-18718-7-git-send-email-imunsie@au1.ibm.com> X-Mailer: git-send-email 1.7.2.3 In-Reply-To: <1296703645-18718-1-git-send-email-imunsie@au1.ibm.com> References: <1296703645-18718-1-git-send-email-imunsie@au1.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1291 Lines: 36 From: Ian Munsie Many system calls are unimplemented and mapped to sys_ni_syscall, but at boot ftrace would still search through every syscall metadata entry for a match which wouldn't be there. This patch adds causes the search to terminate early if the system call is not mapped. Signed-off-by: Ian Munsie --- kernel/trace/trace_syscalls.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index 7b76a65..f498154 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -84,6 +84,9 @@ static struct syscall_metadata *find_syscall_meta(unsigned long syscall) stop = (struct syscall_metadata *)__stop_syscalls_metadata; kallsyms_lookup(syscall, NULL, NULL, NULL, str); + if (arch_syscall_match_sym_name(str, "sys_ni_syscall")) + return NULL; + for ( ; start < stop; start++) { if (start->name && arch_syscall_match_sym_name(str, start->name)) return start; -- 1.7.2.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/