[PATCH] x86-64: Use safe_apic_wait_icr_idle in __send_IPI_dest_field - x86_64

Use safe_apic_wait_icr_idle to check ICR idle bit if the vector is
NMI_VECTOR to avoid potential hangups in the event of crash when kdump
tries to stop the other CPUs.

Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Andi Kleen <ak@suse.de>

diff --git a/include/asm-x86_64/ipi.h b/include/asm-x86_64/ipi.h
index 26961e67194826d24b6d2b272b48683a6c1d4863..a7c75ea408a8072ed35aca77bf9be85b2ef525e5 100644 (file)
--- a/include/asm-x86_64/ipi.h
+++ b/include/asm-x86_64/ipi.h
@@ -85,7 +85,10 @@ static inline void __send_IPI_dest_field(unsigned int mask, int vector, unsigned
        /*
         * Wait for idle.
         */
-       apic_wait_icr_idle();
+       if (unlikely(vector == NMI_VECTOR))
+               safe_apic_wait_icr_idle();
+       else
+               apic_wait_icr_idle();
 
        /*
         * prepare target chip field