Successful RMW operations are supposed to be fully ordered, but
Alpha's xchg() and cmpxchg() do not align to this requirement.

Will reported that:

> So MP using xchg:
>
> WRITE_ONCE(x, 1)
> xchg(y, 1)
>
> smp_load_acquire(y) == 1
> READ_ONCE(x) == 0
>
> would be allowed.

(thus violating the above requirement).  Amend this by adding a
leading smp_mb() to the implementations of xchg(), cmpxchg().

Reported-by: Will Deacon <will.dea...@arm.com>
Signed-off-by: Andrea Parri <parri.and...@gmail.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com>
Cc: Alan Stern <st...@rowland.harvard.edu>
Cc: Ivan Kokshaysky <i...@jurassic.park.msu.ru>
Cc: Matt Turner <matts...@gmail.com>
Cc: Richard Henderson <r...@twiddle.net>
Cc: linux-alpha@vger.kernel.org
Cc: linux-ker...@vger.kernel.org
---
 arch/alpha/include/asm/xchg.h | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/arch/alpha/include/asm/xchg.h b/arch/alpha/include/asm/xchg.h
index e1facf6fc2446..e2b59fac5257d 100644
--- a/arch/alpha/include/asm/xchg.h
+++ b/arch/alpha/include/asm/xchg.h
@@ -12,6 +12,10 @@
  * Atomic exchange.
  * Since it can be used to implement critical sections
  * it must clobber "memory" (also for interrupts in UP).
+ *
+ * The leading and the trailing memory barriers guarantee that these
+ * operations are fully ordered.
+ *
  */
 
 static inline unsigned long
@@ -19,6 +23,7 @@ ____xchg(_u8, volatile char *m, unsigned long val)
 {
        unsigned long ret, tmp, addr64;
 
+       smp_mb();
        __asm__ __volatile__(
        "       andnot  %4,7,%3\n"
        "       insbl   %1,%4,%1\n"
@@ -43,6 +48,7 @@ ____xchg(_u16, volatile short *m, unsigned long val)
 {
        unsigned long ret, tmp, addr64;
 
+       smp_mb();
        __asm__ __volatile__(
        "       andnot  %4,7,%3\n"
        "       inswl   %1,%4,%1\n"
@@ -67,6 +73,7 @@ ____xchg(_u32, volatile int *m, unsigned long val)
 {
        unsigned long dummy;
 
+       smp_mb();
        __asm__ __volatile__(
        "1:     ldl_l %0,%4\n"
        "       bis $31,%3,%1\n"
@@ -87,6 +94,7 @@ ____xchg(_u64, volatile long *m, unsigned long val)
 {
        unsigned long dummy;
 
+       smp_mb();
        __asm__ __volatile__(
        "1:     ldq_l %0,%4\n"
        "       bis $31,%3,%1\n"
@@ -128,9 +136,12 @@ ____xchg(, volatile void *ptr, unsigned long x, int size)
  * store NEW in MEM.  Return the initial value in MEM.  Success is
  * indicated by comparing RETURN with OLD.
  *
- * The memory barrier is placed in SMP unconditionally, in order to
- * guarantee that dependency ordering is preserved when a dependency
- * is headed by an unsuccessful operation.
+ * The leading and the trailing memory barriers guarantee that these
+ * operations are fully ordered.
+ *
+ * The trailing memory barrier is placed in SMP unconditionally, in
+ * order to guarantee that dependency ordering is preserved when a
+ * dependency is headed by an unsuccessful operation.
  */
 
 static inline unsigned long
@@ -138,6 +149,7 @@ ____cmpxchg(_u8, volatile char *m, unsigned char old, 
unsigned char new)
 {
        unsigned long prev, tmp, cmp, addr64;
 
+       smp_mb();
        __asm__ __volatile__(
        "       andnot  %5,7,%4\n"
        "       insbl   %1,%5,%1\n"
@@ -165,6 +177,7 @@ ____cmpxchg(_u16, volatile short *m, unsigned short old, 
unsigned short new)
 {
        unsigned long prev, tmp, cmp, addr64;
 
+       smp_mb();
        __asm__ __volatile__(
        "       andnot  %5,7,%4\n"
        "       inswl   %1,%5,%1\n"
@@ -192,6 +205,7 @@ ____cmpxchg(_u32, volatile int *m, int old, int new)
 {
        unsigned long prev, cmp;
 
+       smp_mb();
        __asm__ __volatile__(
        "1:     ldl_l %0,%5\n"
        "       cmpeq %0,%3,%1\n"
@@ -215,6 +229,7 @@ ____cmpxchg(_u64, volatile long *m, unsigned long old, 
unsigned long new)
 {
        unsigned long prev, cmp;
 
+       smp_mb();
        __asm__ __volatile__(
        "1:     ldq_l %0,%5\n"
        "       cmpeq %0,%3,%1\n"
-- 
2.7.4

--
To unsubscribe from this list: send the line "unsubscribe linux-alpha" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Reply via email to