[Xen-changelog] [xen stable-4.12] Arm/atomic: correct asm() constraints in build_add_sized()

[patchbot@xxxxxxx]

commit 36f04634ce8553edf1496ff4b0bfc41416e55d94
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Mar 12 14:42:17 2019 +0100
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Fri Apr 19 11:58:46 2019 -0700

    Arm/atomic: correct asm() constraints in build_add_sized()
    
    The memory operand is an in/out one, and the auxiliary register gets
    written to early.
    
    Take the opportunity and also drop the redundant cast (the inline
    functions' parameters are already of the casted-to type).
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Julien Grall <julien.grall@xxxxxxx>
    (cherry picked from commit 51ceb1623b9956440f1b9943c67010a90d61f5c5)
---
 xen/include/asm-arm/atomic.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/include/asm-arm/atomic.h b/xen/include/asm-arm/atomic.h
index 50f2835e35..afb3eeea5b 100644
--- a/xen/include/asm-arm/atomic.h
+++ b/xen/include/asm-arm/atomic.h
@@ -30,7 +30,7 @@ static inline void name(volatile type *addr, type val)        
          \
     asm volatile("ldr" size " %"width"1,%0\n"                           \
                  "add %"width"1,%"width"1,%"width"2\n"                  \
                  "str" size " %"width"1,%0"                             \
-                 : "=m" (*(volatile type *)addr), "=r" (t)              \
+                 : "+m" (*addr), "=&r" (t)                              \
                  : reg (val));                                          \
 }
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.12

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