From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp04.au.ibm.com (e23smtp04.au.ibm.com [202.81.31.146]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e23smtp04.au.ibm.com", Issuer "GeoTrust SSL CA" (verified OK)) by ozlabs.org (Postfix) with ESMTPS id 3E8F4B7141 for ; Thu, 3 Feb 2011 14:27:48 +1100 (EST) Received: from d23relay05.au.ibm.com (d23relay05.au.ibm.com [202.81.31.247]) by e23smtp04.au.ibm.com (8.14.4/8.13.1) with ESMTP id p133MQvC024926 for ; Thu, 3 Feb 2011 14:22:26 +1100 Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.235.139]) by d23relay05.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p133Rl4T1798216 for ; Thu, 3 Feb 2011 14:27:47 +1100 Received: from d23av04.au.ibm.com (loopback [127.0.0.1]) by d23av04.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p133RjHc021591 for ; Thu, 3 Feb 2011 14:27:47 +1100 From: "Ian Munsie" To: linux-kernel@vger.kernel.org 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> In-Reply-To: <1296703645-18718-1-git-send-email-imunsie@au1.ibm.com> References: <1296703645-18718-1-git-send-email-imunsie@au1.ibm.com> Cc: Andreas Dilger , Andreas Schwab , Dave Kleikamp , Namhyung Kim , Jiri Kosina , Jason Baron , Alexander Graf , Steven Rostedt , David Gibson , Ingo Molnar , Paul Mackerras , Ian Munsie , KOSAKI Motohiro , Frederic Weisbecker , Scott Wood , Nathan Lynch , Andrew Morton , linuxppc-dev , Avantika Mathur List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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