[PATCH 10/10] Use safe_apic_wait_icr_idle in __send_IPI_dest_field - x86_64

[Fernando Luis Vázquez Cao]

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 at oss.ntt.co.jp>
---

diff -urNp linux-2.6.21-rc7-orig/include/asm-x86_64/ipi.h linux-2.6.21-rc7/include/asm-x86_64/ipi.h
--- linux-2.6.21-rc7-orig/include/asm-x86_64/ipi.h	2007-04-23 17:34:56.000000000 +0900
+++ linux-2.6.21-rc7/include/asm-x86_64/ipi.h	2007-04-25 19:15:01.000000000 +0900
@@ -87,7 +87,10 @@ static inline void __send_IPI_dest_field
 	/*
 	 * 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