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| author | Jesper Juhl <jesper.juhl@gmail.com> | 2005-09-06 15:17:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-07 16:57:32 -0700 |
| commit | 0730ded5be28653675ed314fdd878b8db5f88aa4 (patch) | |
| tree | e224523373424f4402b70d351caa48e94133a9ab /kernel/sys.c | |
| parent | 5acd57936c3224fd86e838201e528e0169373e9b (diff) | |
| download | linux-0730ded5be28653675ed314fdd878b8db5f88aa4.tar.bz2 | |
[PATCH] remove a redundant variable in sys_prctl()
The patch removes a redundant variable `sig' from sys_prctl().
For some reason, when sys_prctl is called with option == PR_SET_PDEATHSIG
then the value of arg2 is assigned to an int variable named sig. Then sig
is tested with valid_signal() and later used to set the value of
current->pdeath_signal .
There is no reason to use this intermediate variable since valid_signal()
takes a unsigned long argument, so it can handle being passed arg2
directly, and if the call to valid_signal is OK, then we know the value of
arg2 is in the range zero to _NSIG and thus it'll easily fit in a plain int
and thus there's no problem assigning it later to current->pdeath_signal
(which is an int).
The patch gets rid of the pointless variable `sig'.
This reduces the size of kernel/sys.o in 2.6.13-rc6-mm1 by 32 bytes on my
system.
Patch has been compile tested, boot tested, and just to make damn sure I
didn't break anything I wrote a quick test app that calls
prctl(PR_SET_PDEATHSIG ...) with the entire range of values for a
unsigned long, and it behaves as expected with and without the patch.
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/sys.c')
| -rw-r--r-- | kernel/sys.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index 0bcaed6560ac..c80412be2302 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1711,7 +1711,6 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3, unsigned long arg4, unsigned long arg5) { long error; - int sig; error = security_task_prctl(option, arg2, arg3, arg4, arg5); if (error) @@ -1719,12 +1718,11 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3, switch (option) { case PR_SET_PDEATHSIG: - sig = arg2; - if (!valid_signal(sig)) { + if (!valid_signal(arg2)) { error = -EINVAL; break; } - current->pdeath_signal = sig; + current->pdeath_signal = arg2; break; case PR_GET_PDEATHSIG: error = put_user(current->pdeath_signal, (int __user *)arg2); |