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From: "Ian Munsie" <imunsie@au1.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: Andreas Dilger <adilger@dilger.ca>,
	Dave Kleikamp <shaggy@linux.vnet.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Jiri Kosina <jkosina@suse.cz>, Jason Baron <jbaron@redhat.com>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Alexander Graf <agraf@suse.de>, Ingo Molnar <mingo@redhat.com>,
	Paul Mackerras <paulus@samba.org>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Scott Wood <scottwood@freescale.com>,
	Nathan Lynch <ntl@pobox.com>,
	Avantika Mathur <mathur@linux.vnet.ibm.com>,
	David Gibson <dwg@au1.ibm.com>,
	Andreas Schwab <schwab@linux-m68k.org>,
	Namhyung Kim <namhyung@gmail.com>,
	Ian Munsie <imunsie@au1.ibm.com>
Subject: [PATCH 6/6] ftrace syscalls: Early terminate search for sys_ni_syscall
Date: Thu,  3 Feb 2011 14:27:25 +1100	[thread overview]
Message-ID: <1296703645-18718-7-git-send-email-imunsie@au1.ibm.com> (raw)
In-Reply-To: <1296703645-18718-1-git-send-email-imunsie@au1.ibm.com>

From: Ian Munsie <imunsie@au1.ibm.com>

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 <imunsie@au1.ibm.com>
---
 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


  parent reply	other threads:[~2011-02-03  3:28 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-03  3:27 PowerPC, ftrace: Add PPC raw syscall tracepoints & ftrace fixes (mimimal subset only) v4 Ian Munsie
2011-02-03  3:27 ` [PATCH 1/6] ftrace syscalls: don't add events for unmapped syscalls Ian Munsie
2011-02-17 14:58   ` [tip:perf/core] tracing/syscalls: Don't " tip-bot for Ian Munsie
2011-02-03  3:27 ` [PATCH 2/6] ftrace syscalls: Convert redundant syscall_nr checks into WARN_ON Ian Munsie
2011-02-17 14:59   ` [tip:perf/core] tracing/syscalls: " tip-bot for Ian Munsie
2011-02-03  3:27 ` [PATCH 3/6] ftrace syscalls: Make arch_syscall_addr weak Ian Munsie
2011-02-17 14:59   ` [tip:perf/core] tracing/syscalls: " tip-bot for Ian Munsie
2011-02-03  3:27 ` [PATCH 4/6] ftrace syscalls: Allow arch specific syscall symbol matching Ian Munsie
2011-02-17 14:59   ` [tip:perf/core] tracing/syscalls: " tip-bot for Ian Munsie
2011-02-03  3:27 ` [PATCH 5/6] ftrace, powerpc: Implement raw syscall tracepoints on PowerPC Ian Munsie
2011-02-08  2:10   ` Steven Rostedt
2011-02-08 10:07     ` Benjamin Herrenschmidt
2011-02-08 16:54       ` Steven Rostedt
2011-02-03  3:27 ` Ian Munsie [this message]
2011-02-17 15:00   ` [tip:perf/core] tracing/syscalls: Early terminate search for sys_ni_syscall tip-bot for Ian Munsie
2011-02-08  2:10 ` PowerPC, ftrace: Add PPC raw syscall tracepoints & ftrace fixes (mimimal subset only) v4 Steven Rostedt

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