[PATCH] x86-64: Fix race in exit_idle

When another interrupt happens in exit_idle the exit idle notifier
could be called an incorrect number of times.

Add a test_and_clear_bit_pda and use it handle the bit
atomically against interrupts to avoid this.

Pointed out by Stephane Eranian

Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/asm-x86_64/pda.h b/include/asm-x86_64/pda.h
index 14996d962bac..5642634843c4 100644
--- a/include/asm-x86_64/pda.h
+++ b/include/asm-x86_64/pda.h
@@ -109,6 +109,15 @@ extern struct x8664_pda _proxy_pda;
 #define sub_pda(field,val) pda_to_op("sub",field,val)
 #define or_pda(field,val) pda_to_op("or",field,val)
 
+/* This is not atomic against other CPUs -- CPU preemption needs to be off */
+#define test_and_clear_bit_pda(bit,field) ({            \
+        int old__;                                              \
+        asm volatile("btr %2,%%gs:%c3\n\tsbbl %0,%0"            \
+            : "=r" (old__), "+m" (_proxy_pda.field)             \
+            : "dIr" (bit), "i" (pda_offset(field)) : "memory"); \
+        old__;                                                  \
+})
+
 #endif
 
 #define PDA_STACKOFFSET (5*8)