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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>
This commit is contained in:
Ian Munsie 2011-02-03 14:27:25 +11:00 committed by Steven Rostedt
parent b2d5549681
commit ae07f551c4
1 changed files with 3 additions and 0 deletions
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3
kernel/trace/trace_syscalls.c
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@ -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;