Commit ae07f551 authored Feb 03, 2011 by Ian Munsie Committed by Steven Rostedt Feb 07, 2011

tracing/syscalls: Early terminate search for sys_ni_syscall



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>
LKML-Reference: <1296703645-18718-7-git-send-email-imunsie@au1.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

parent b2d55496

kernel/trace/trace_syscalls.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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;