[PATCH v2 3/3] arm64: smp: Disable priority masking when NMI is enable on PSR.I section
From: Yuichi Ito <hidden>
Date: 2020-11-04 08:17:57
Also in:
lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
It should be prohibitted to use priority masking in NMI context. Using local_irq_disable() under the above conditions causes a WARNING. Then, there will be also a mismatch between the PSR.I values and PMR GIC_PRIO_PSR_I_SET. Signed-off-by: Yuichi Ito <redacted> --- arch/arm64/kernel/smp.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index fd59bc7..3c49f06 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c@@ -872,7 +872,9 @@ static void ipi_cpu_crash_stop(unsigned int cpu, struct pt_regs *regs) atomic_dec(&waiting_for_crash_ipi); - local_irq_disable(); + if(!in_nmi()) + local_irq_disable(); + sdei_mask_local_cpu(); if (IS_ENABLED(CONFIG_HOTPLUG_CPU))
--
1.8.3.1
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