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[PATCH] x86_64: Don't do broadcast IPIs when hotplug is enabled in flat mode.

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The use of non-shortcut version of routines breaking CPU hotplug.  The option
to select this via cmdline also is deleted with the physflat patch, hence
directly placing this code under CONFIG_HOTPLUG_CPU.

We dont want to use broadcast mode IPI's when hotplug is enabled.  This causes
bad effects in send IPI to a cpu that is offline which can trip when the cpu
is in the process of being kicked alive.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Acked-by: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ashok Raj 2005-09-09 13:01:52 -07:00 committed by Linus Torvalds
parent 4c7fc7220f
commit fdf26d933a
1 changed files with 10 additions and 0 deletions
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arch/x86_64/kernel/genapic_flat.c
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@ -78,8 +78,18 @@ static void flat_send_IPI_mask(cpumask_t cpumask, int vector)
static void flat_send_IPI_allbutself(int vector) static void flat_send_IPI_allbutself(int vector)
{ {
#ifndef CONFIG_HOTPLUG_CPU
if (((num_online_cpus()) - 1) >= 1) if (((num_online_cpus()) - 1) >= 1)
__send_IPI_shortcut(APIC_DEST_ALLBUT, vector,APIC_DEST_LOGICAL); __send_IPI_shortcut(APIC_DEST_ALLBUT, vector,APIC_DEST_LOGICAL);
#else
cpumask_t allbutme = cpu_online_map;
int me = get_cpu(); /* Ensure we are not preempted when we clear */
cpu_clear(me, allbutme);
if (!cpus_empty(allbutme))
flat_send_IPI_mask(allbutme, vector);
put_cpu();
#endif
} }
static void flat_send_IPI_all(int vector) static void flat_send_IPI_all(int vector)