powerpc: fix double syscall restarts

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Make sigreturn zero regs->trap, make do_signal() do the same on all
paths.  As it is, signal interrupting e.g. read() from fd 512 (==
ERESTARTSYS) with another signal getting unblocked when the first
handler finishes will lead to restart one insn earlier than it ought
to.  Same for multiple signals with in-kernel handlers interrupting
that sucker at the same time.  Same for multiple signals of any kind
interrupting that sucker on 64bit...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

...

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Al Viro 2010-09-20 21:48:57 +01:00 • committed by Linus Torvalds

parent b68e9d4581

commit 9a81c16b52

3 changed files with 4 additions and 3 deletions

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2

arch/powerpc/kernel/signal.c

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3

arch/powerpc/kernel/signal_32.c

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2

arch/powerpc/kernel/signal_64.c

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