signal: cleanup sys_rt_sigprocmask()

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sys_rt_sigprocmask() looks unnecessarily complicated, simplify it.
We can just read current->blocked lockless unconditionally before
anything else and then copy-to-user it if needed.  At worst we
copy 4 words on mips.

We could copy-to-user the old mask first and simplify the code even
more, but the patch tries to keep the current behaviour: we change
current->block even if copy_to_user(oset) fails.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Matt Fleming <matt.fleming@linux.intel.com>
Acked-by: Tejun Heo <tj@kernel.org>

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Oleg Nesterov 2011-04-27 21:18:10 +02:00

parent e9bd3f0faa

commit bb7efee2ca

1 changed files with 16 additions and 22 deletions

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kernel/signal.c

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