[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>

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)