diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2020-02-19 09:46:47 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-05-19 15:51:17 +0200 |
| commit | 69ea03b56ed2c7189ccd0b5910ad39f3cad1df21 (patch) | |
| tree | f5070915d8d90d28e70b6a467db88c69a73d803e /arch/arm64/kernel/sdei.c | |
| parent | 28f6bf9e247fe23d177cfdbf7e709270e8cc7fa6 (diff) | |
| download | lwn-69ea03b56ed2c7189ccd0b5910ad39f3cad1df21.tar.gz lwn-69ea03b56ed2c7189ccd0b5910ad39f3cad1df21.zip | |
hardirq/nmi: Allow nested nmi_enter()
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
Diffstat (limited to 'arch/arm64/kernel/sdei.c')
| -rw-r--r-- | arch/arm64/kernel/sdei.c | 14 |
1 files changed, 2 insertions, 12 deletions
diff --git a/arch/arm64/kernel/sdei.c b/arch/arm64/kernel/sdei.c index d6259dac62b6..e396e69e33a1 100644 --- a/arch/arm64/kernel/sdei.c +++ b/arch/arm64/kernel/sdei.c @@ -251,22 +251,12 @@ asmlinkage __kprobes notrace unsigned long __sdei_handler(struct pt_regs *regs, struct sdei_registered_event *arg) { unsigned long ret; - bool do_nmi_exit = false; - /* - * nmi_enter() deals with printk() re-entrance and use of RCU when - * RCU believed this CPU was idle. Because critical events can - * interrupt normal events, we may already be in_nmi(). - */ - if (!in_nmi()) { - nmi_enter(); - do_nmi_exit = true; - } + nmi_enter(); ret = _sdei_handler(regs, arg); - if (do_nmi_exit) - nmi_exit(); + nmi_exit(); return ret; } |