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Message queues can signal a process waiting for a message. This patch replaces the pid_t value with a struct pid to avoid pid wrap around problems. Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Acked-by: Eric Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>