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authorJesper Juhl <jesper.juhl@gmail.com>2005-09-06 15:17:37 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-07 16:57:32 -0700
commit0730ded5be28653675ed314fdd878b8db5f88aa4 (patch)
treee224523373424f4402b70d351caa48e94133a9ab /mm/internal.h
parent5acd57936c3224fd86e838201e528e0169373e9b (diff)
[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 'mm/internal.h')
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