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authorThomas Gleixner <tglx@linutronix.de>2008-09-22 18:54:29 +0200
committerThomas Gleixner <tglx@linutronix.de>2008-09-23 11:38:52 +0200
commit4faac97d44ac27bdbb010a9c3597401a8f89341f (patch)
tree680f128d2bf1cec0fdc77f7a8cb3f3f54264d282 /arch/x86/kernel/process_64.c
parent6441402b1f173fa38e561d3cee7c01c32e5281ad (diff)
x86: prevent stale state of c1e_mask across CPU offline/online
Impact: hang which happens across CPU offline/online on AMD C1E systems. When a CPU goes offline then the corresponding bit in the broadcast mask is cleared. For AMD C1E enabled CPUs we do not reenable the broadcast when the CPU comes online again as we do not clear the corresponding bit in the c1e_mask, which keeps track which CPUs have been switched to broadcast already. So on those !$@#& machines we never switch back to broadcasting after a CPU offline/online cycle. Clear the bit when the CPU plays dead. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/process_64.c')
-rw-r--r--arch/x86/kernel/process_64.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 71553b664e2a..e12e0e4dd256 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -93,6 +93,8 @@ DECLARE_PER_CPU(int, cpu_state);
static inline void play_dead(void)
{
idle_task_exit();
+ c1e_remove_cpu(raw_smp_processor_id());
+
mb();
/* Ack it */
__get_cpu_var(cpu_state) = CPU_DEAD;