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printk: Disallow instrumenting print_nmi_enter()
authorPeter Zijlstra <peterz@infradead.org>
Mon, 24 Feb 2020 21:25:03 +0000 (22:25 +0100)
committerThomas Gleixner <tglx@linutronix.de>
Tue, 19 May 2020 13:51:16 +0000 (15:51 +0200)
commitb0f51883f551b900a04a80f49fb0886caf7e9a12
tree4de0c3f992cd9381608c90b847473322a32cfa21tree
parent8c4e93c362ff114def211d4629b120af86eb1275commit | diff
printk: Disallow instrumenting print_nmi_enter()

It happens early in nmi_enter(), no tracing, probing or other funnies
allowed. Specifically as nmi_enter() will be used in do_debug(), which
would cause recursive exceptions when kprobed.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Link: https://lkml.kernel.org/r/20200505134101.139720912@linutronix.de
kernel/printk/printk_safe.c diff | blob | blame | history
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