The patch titled
ia64: avoid invoking irq handlers on offline CPUs
has been added to the -mm tree. Its filename is
ia64-avoid-invoking-irq-handlers-on-offline-cpus.patch
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See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
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Subject: ia64: avoid invoking irq handlers on offline CPUs
From: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Make ia64 refrain from clearing a given to-be-offlined CPU's bit in the
cpu_online_mask until it has processed pending irqs. This change prevents
other CPUs from being blindsided by an apparently offline CPU nevertheless
changing globally visible state. Also remove the existing redundant
cpu_clear(cpu, cpu_online_map).
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Vegard Nossum <vegard.nossum@xxxxxxxxx>
Cc: Jes Sorensen <jes@xxxxxxxxxxxxxxxxxx>
Cc: Manfred Spraul <manfred@xxxxxxxxxxxxxxxx>
Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/ia64/kernel/smpboot.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff -puN arch/ia64/kernel/smpboot.c~ia64-avoid-invoking-irq-handlers-on-offline-cpus arch/ia64/kernel/smpboot.c
--- a/arch/ia64/kernel/smpboot.c~ia64-avoid-invoking-irq-handlers-on-offline-cpus
+++ a/arch/ia64/kernel/smpboot.c
@@ -741,16 +741,14 @@ int __cpu_disable(void)
return -EBUSY;
}
- cpu_clear(cpu, cpu_online_map);
-
if (migrate_platform_irqs(cpu)) {
cpu_set(cpu, cpu_online_map);
return (-EBUSY);
}
remove_siblinginfo(cpu);
- cpu_clear(cpu, cpu_online_map);
fixup_irqs();
+ cpu_clear(cpu, cpu_online_map);
local_flush_tlb_all();
cpu_clear(cpu, cpu_callin_map);
return 0;
_
Patches currently in -mm which might be from paulmck@xxxxxxxxxxxxxxxxxx are
linux-next.patch
ia64-avoid-invoking-irq-handlers-on-offline-cpus.patch
rcu-spinlocks-take-an-unsigned-long-flags.patch
rcu-fix-sparse-shadowed-variable-warning.patch
modules-remove-stop_machine-during-module-load.patch
modules-remove-stop_machine-during-module-load-checkpatch-fixes.patch
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