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authorPaul Mackerras <paulus@samba.org>2008-03-26 08:44:18 +1100
committerPaul Mackerras <paulus@samba.org>2008-03-26 08:44:18 +1100
commit54f53f2b94feb72622bec7a8563fc487d9f97720 (patch)
treeab0c4e1dcadd25a00fa7a4febf41bc43b864cf73 /arch/powerpc/kernel/process.c
parentf61fb8a52cdf8b9b6a6badde84aefe58cb35d315 (diff)
parenta4083c9271e0a697278e089f2c0b9a95363ada0a (diff)
Merge branch 'linux-2.6'
Diffstat (limited to 'arch/powerpc/kernel/process.c')
-rw-r--r--arch/powerpc/kernel/process.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 7c8e3da23810..8d506d86e2df 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -353,6 +353,12 @@ struct task_struct *__switch_to(struct task_struct *prev,
account_process_vtime(current);
calculate_steal_time();
+ /*
+ * We can't take a PMU exception inside _switch() since there is a
+ * window where the kernel stack SLB and the kernel stack are out
+ * of sync. Hard disable here.
+ */
+ hard_irq_disable();
last = _switch(old_thread, new_thread);
local_irq_restore(flags);