sysrq: Properly check for kernel threads
authorAnton Vorontsov <anton.vorontsov@linaro.org>
Tue, 7 Feb 2012 06:49:51 +0000 (10:49 +0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 9 Feb 2012 17:03:30 +0000 (09:03 -0800)
commitd3a532a9c617106a0169232d40164ee35d0440b5
tree4204ef5560c353f91cd275fb8303d799869dd97c
parente502babe0a85226f2417b60a8710cf8192879180
sysrq: Properly check for kernel threads

There's a real possibility of killing kernel threads that might
have issued use_mm(), so kthread's mm might become non-NULL.

This patch fixes the issue by checking for PF_KTHREAD (just as
get_task_mm()).

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/sysrq.c