SUNRPC: fix include for cmpxhg_relaxed()
diff mbox

Message ID
State New
Headers show

Commit Message

Mark Rutland March 15, 2017, 10:35 a.m. UTC
Currently net/sunrpc/xprtmultipath.c is the only file outside of arch/
headers and asm-generic/ headers to include <asm/cmpxhcg.h>, apparently
for the use of cmpxchg_relaxed().

However, many architectures do not provide cmpxchg_relaxed() in their
<asm/cmpxhcg.h>, and it is necessary to include <linux/atomic.h> to get
this definition, as noted in Documentation/core-api/atomic_ops.rst:

  If someone wants to use xchg(), cmpxchg() and their variants,
  linux/atomic.h should be included rather than asm/cmpxchg.h, unless
  the code is in arch/* and can take care of itself.

Evidently we're getting the right header this via some transitive
include today, but this isn't something we can/should rely upon,
especially with ongoing rework of the atomic headers for KASAN

Let's fix the code to include <linux/atomic.h>, avoiding fragility.

Signed-off-by: Mark Rutland <>
Cc: Trond Myklebust <>
Cc: Anna Schumaker <>
Cc: J. Bruce Fields <>
Cc: Jeff Layton <>
Cc: David S. Miller <>
 net/sunrpc/xprtmultipath.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff mbox

diff --git a/net/sunrpc/xprtmultipath.c b/net/sunrpc/xprtmultipath.c
index ae92a9e..3b1e856 100644
--- a/net/sunrpc/xprtmultipath.c
+++ b/net/sunrpc/xprtmultipath.c
@@ -12,7 +12,7 @@ 
 #include <linux/rcupdate.h>
 #include <linux/rculist.h>
 #include <linux/slab.h>
-#include <asm/cmpxchg.h>
+#include <linux/atomic.h>
 #include <linux/spinlock.h>
 #include <linux/sunrpc/xprt.h>
 #include <linux/sunrpc/addr.h>