[PATCH 4/4] stack overflow safe kdump (2.6.18-rc1-i386) -safe_smp_send_nmi_allbutself

[Fernando Luis Vázquez Cao]

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@xxxxxxxxxxxxxxxxx>
---

diff -urNp linux-2.6.18-rc1/arch/i386/kernel/crash.c linux-2.6.18-rc1-sof/arch/i386/kernel/crash.c
--- linux-2.6.18-rc1/arch/i386/kernel/crash.c	2006-07-11 14:14:04.000000000 +0900
+++ linux-2.6.18-rc1-sof/arch/i386/kernel/crash.c	2006-07-11 14:15:49.000000000 +0900
@@ -122,7 +122,10 @@ static int crash_nmi_callback(struct pt_
 
 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 void nmi_shootdown_cpus(void)


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