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authorVincent Whitchurch <vincent.whitchurch@axis.com>2018-08-21 17:25:07 +0200
committerThomas Gleixner <tglx@linutronix.de>2018-08-30 12:56:40 +0200
commitcb9d7fd51d9fbb329d182423bd7b92d0f8cb0e01 (patch)
tree617f11702e19fd0cc2f07eef3a922716476ec6b9 /mm
parent5b394b2ddf0347bef56e50c69a58773c94343ff3 (diff)
downloadlinux-stericsson-cb9d7fd51d9fbb329d182423bd7b92d0f8cb0e01.tar.gz
watchdog: Mark watchdog touch functions as notrace
Some architectures need to use stop_machine() to patch functions for ftrace, and the assumption is that the stopped CPUs do not make function calls to traceable functions when they are in the stopped state. Commit ce4f06dcbb5d ("stop_machine: Touch_nmi_watchdog() after MULTI_STOP_PREPARE") added calls to the watchdog touch functions from the stopped CPUs and those functions lack notrace annotations. This leads to crashes when enabling/disabling ftrace on ARM kernels built with the Thumb-2 instruction set. Fix it by adding the necessary notrace annotations. Fixes: ce4f06dcbb5d ("stop_machine: Touch_nmi_watchdog() after MULTI_STOP_PREPARE") Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: oleg@redhat.com Cc: tj@kernel.org Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20180821152507.18313-1-vincent.whitchurch@axis.com
Diffstat (limited to 'mm')
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