https://github.com/torvalds/linux
Revision cb9d7fd51d9fbb329d182423bd7b92d0f8cb0e01 authored by Vincent Whitchurch on 21 August 2018, 15:25:07 UTC, committed by Thomas Gleixner on 30 August 2018, 10:56:40 UTC
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

1 parent 5b394b2
History
Tip revision: cb9d7fd51d9fbb329d182423bd7b92d0f8cb0e01 authored by Vincent Whitchurch on 21 August 2018, 15:25:07 UTC
watchdog: Mark watchdog touch functions as notrace
Tip revision: cb9d7fd
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