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From: Bodo Stroesser <bstroesser@fujitsu-siemens.com>

handle_signal now checks whether it is being called from a system call
invocation.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>