From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755900Ab1BHWSD (ORCPT ); Tue, 8 Feb 2011 17:18:03 -0500 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:57419 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754700Ab1BHWRX (ORCPT ); Tue, 8 Feb 2011 17:17:23 -0500 X-Authority-Analysis: v=1.1 cv=UQuFHoD2CPQ248x8AXEbKhr4z9AaDqApxmEl3BhfZ64= c=1 sm=0 a=gLg6x_zP4vUA:10 a=bbbx4UPp9XUA:10 a=OPBmh+XkhLl+Enan7BmTLg==:17 a=VnNF1IyMAAAA:8 a=meVymXHHAAAA:8 a=7enPJPt5mC7gaRCchMIA:9 a=-JdBgREuWHIgjY3zMANXE2Hr0qYA:4 a=jeBq3FmKZ4MA:10 a=OPBmh+XkhLl+Enan7BmTLg==:117 X-Cloudmark-Score: 0 X-Originating-IP: 67.242.120.143 Message-Id: <20110208221720.077315754@goodmis.org> User-Agent: quilt/0.48-1 Date: Tue, 08 Feb 2011 17:16:17 -0500 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Andrew Morton , Frederic Weisbecker , Ian Munsie Subject: [PATCH 05/10] tracing/syscalls: Early terminate search for sys_ni_syscall References: <20110208221612.084294240@goodmis.org> Content-Disposition: inline; filename=0005-tracing-syscalls-Early-terminate-search-for-sys_ni_s.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 LKML-Reference: <1296703645-18718-7-git-send-email-imunsie@au1.ibm.com> Signed-off-by: Steven Rostedt --- 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 86a23e7..ee7b5a0 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -85,6 +85,9 @@ find_syscall_meta(unsigned long syscall) stop = __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