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[ Upstream commit2591bc4e8d] apic->send_IPI_allbutself() takes a vector number as argument. APIC_DM_NMI is clearly not a vector number. It's defined to 0x400 which is outside the vector space. Use NMI_VECTOR instead as that's what it is intended to be. Fixes:82da3ff89d("x86: kgdb support") Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20190722105218.855189979@linutronix.de Signed-off-by: Sasha Levin <sashal@kernel.org>