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 instrumentation. Let's fix the code to include <linux/atomic.h>, avoiding fragility. Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx> Cc: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx> Cc: Anna Schumaker <anna.schumaker@xxxxxxxxxx> Cc: J. Bruce Fields <bfields@xxxxxxxxxxxx> Cc: Jeff Layton <jlayton@xxxxxxxxxxxxxxx> Cc: David S. Miller <davem@xxxxxxxxxxxxx> Cc: linux-nfs@xxxxxxxxxxxxxxx Cc: netdev@xxxxxxxxxxxxxxx --- net/sunrpc/xprtmultipath.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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> -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
