[POWERPC] Make sure interrupt enable gets restored properly
The lazy IRQ disable patch missed a couple of places where the
interrupt enable flags need to be restored correctly. First, we
weren't restoring the paca->hard_enabled flag on interrupt exit.
Instead of saving it on entry, we compute it from the MSR_EE bit
in the MSR we are restoring at exit. Secondly, the MMU hash miss
code was clearing both paca->soft_enabled and paca->hard_enabled
but not restoring them in the case where hash_page was able to
resolve the miss from the Linux page tables.
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index efda487..86e2bdd 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -489,6 +489,10 @@
andi. r0,r3,MSR_RI
beq- unrecov_restore
+ /* extract EE bit and use it to restore paca->hard_enabled */
+ rldicl r4,r3,49,63 /* r0 = (r3 >> 15) & 1 */
+ stb r4,PACAHARDIRQEN(r13)
+
andi. r0,r3,MSR_PR
/*