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| author | Ashok Raj <ashok.raj@intel.com> | 2005-09-09 13:01:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-09 13:57:30 -0700 |
| commit | fdf26d933a8171c2a5bd35b4a5ca3b099a216a35 (patch) | |
| tree | 768cfb8802e2c03e05bf1e15f36a0c5a6a039bd0 /arch | |
| parent | 4c7fc7220f6a3cce9b3f4bd66362176df67df577 (diff) | |
| download | lwn-fdf26d933a8171c2a5bd35b4a5ca3b099a216a35.tar.gz lwn-fdf26d933a8171c2a5bd35b4a5ca3b099a216a35.zip | |
[PATCH] x86_64: Don't do broadcast IPIs when hotplug is enabled in flat mode.
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86_64/kernel/genapic_flat.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/genapic_flat.c b/arch/x86_64/kernel/genapic_flat.c index adc96282a9e2..6d57da96bf8c 100644 --- a/arch/x86_64/kernel/genapic_flat.c +++ b/arch/x86_64/kernel/genapic_flat.c @@ -78,8 +78,18 @@ static void flat_send_IPI_mask(cpumask_t cpumask, int vector) static void flat_send_IPI_allbutself(int vector) { +#ifndef CONFIG_HOTPLUG_CPU if (((num_online_cpus()) - 1) >= 1) __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) |