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Message-Id: <1177501872.17974.56.camel@sebastian.intellilink.co.jp> Date: Wed, 25 Apr 2007 20:51:12 +0900 From: Fernando Luis Vázquez Cao <fernando@....ntt.co.jp> To: "Eric W. Biederman" <ebiederm@...ssion.com> Cc: horms@...ge.net.au, kexec@...ts.infradead.org, linux-kernel@...r.kernel.org, ak@...e.de, vgoyal@...ibm.com, mbligh@...gle.com, Keith Owens <kaos@....com.au>, akpm@...ux-foundation.org Subject: [PATCH 10/10] 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@....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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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