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hardirq/nmi: Allow nested nmi_enter()

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Since there are already a number of sites (ARM64, PowerPC) that effectively
nest nmi_enter(), make the primitive support this before adding even more.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Marc Zyngier <maz@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lkml.kernel.org/r/20200505134100.864179229@linutronix.de
This commit is contained in:
Peter Zijlstra 2020-02-19 09:46:47 +01:00 • committed by Thomas Gleixner
parent 28f6bf9e24
commit 69ea03b56e
5 changed files with 16 additions and 37 deletions
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5
include/linux/hardirq.h
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@ -65,13 +65,16 @@ extern void irq_exit(void);
#define arch_nmi_exit() do { } while (0)
#endif
/*
* nmi_enter() can nest up to 15 times; see NMI_BITS.
*/
#define nmi_enter() \
do { \
arch_nmi_enter(); \
printk_nmi_enter(); \
lockdep_off(); \
ftrace_nmi_enter(); \
BUG_ON(in_nmi()); \
BUG_ON(in_nmi() == NMI_MASK); \
preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET); \
rcu_nmi_enter(); \
lockdep_hardirq_enter(); \