From bc03613decef0cc4d2f3a24f19fa5a868745715f Mon Sep 17 00:00:00 2001
From: Fernando Vazquez <fernando@intellilink.co.jp>
Date: Sat, 30 Sep 2006 23:29:10 -0700
Subject: [PATCH] [PATCH] stack overflow safe kdump: safe
smp_send_nmi_allbutself()
Re-implement smp_send_nmi_allbutself() so that calls to smp_processor_id
(through send_IPI_allbutself) can be replaced with safe_smp_processor_id
without affecting other parts of the kernel (as suggested by Eric Biederman).
Signed-off-by: Fernando Vazquez <fernando@intellilink.co.jp>
Looks-reasonable-to: Andi Kleen <ak@muc.de>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
arch/i386/kernel/crash.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/i386/kernel/crash.c b/arch/i386/kernel/crash.c
index 2dfc049dafa3dc..144b432889655a 100644
--- a/arch/i386/kernel/crash.c
+++ b/arch/i386/kernel/crash.c
@@ -134,7 +134,10 @@ static int crash_nmi_callback(struct notifier_block *self,
static void smp_send_nmi_allbutself(void)
{
- send_IPI_allbutself(NMI_VECTOR);
+ cpumask_t mask = cpu_online_map;
+ cpu_clear(safe_smp_processor_id(), mask);
+ if (!cpus_empty(mask))
+ send_IPI_mask(mask, NMI_VECTOR);
}
static struct notifier_block crash_nmi_nb = {
--
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