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.rutl...@arm.com> Cc: Trond Myklebust <trond.mykleb...@primarydata.com> Cc: Anna Schumaker <anna.schuma...@netapp.com> Cc: J. Bruce Fields <bfie...@fieldses.org> Cc: Jeff Layton <jlay...@poochiereds.net> Cc: David S. Miller <da...@davemloft.net> Cc: linux-...@vger.kernel.org Cc: netdev@vger.kernel.org --- 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
