From 329d400f47ddfe8ff599823d739c5c5565da3207 Mon Sep 17 00:00:00 2001 From: Zwane Mwaikambo Date: Wed, 11 Jan 2006 22:43:09 +0100 Subject: [PATCH] x86_64/i386: Remove preempt disable calls in lowlevel IPI I noticed that some lowlevel send_IPI_mask helpers had a hotplug/preempt race whereupon the cpu_online_map was read before disabling preemption; ... cpumask_t mask = cpu_online_map; int cpu = get_cpu(); cpu_clear(cpu, mask); ... But then i realised that there is no need for these lowlevel functions to be going through all this trouble when all the callers are already made hotplug/preempt safe. Signed-off-by: Zwane Mwaikambo Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- include/asm-i386/mach-default/mach_ipi.h | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'include/asm-i386/mach-default') diff --git a/include/asm-i386/mach-default/mach_ipi.h b/include/asm-i386/mach-default/mach_ipi.h index cc756a67cd63..a1d0072e36bc 100644 --- a/include/asm-i386/mach-default/mach_ipi.h +++ b/include/asm-i386/mach-default/mach_ipi.h @@ -15,11 +15,9 @@ static inline void __local_send_IPI_allbutself(int vector) { if (no_broadcast) { cpumask_t mask = cpu_online_map; - int this_cpu = get_cpu(); - cpu_clear(this_cpu, mask); + cpu_clear(smp_processor_id(), mask); send_IPI_mask(mask, vector); - put_cpu(); } else __send_IPI_shortcut(APIC_DEST_ALLBUT, vector); } -- cgit v1.2.2