markers: remove ACCESS_ONCE

As Paul pointed out, the ACCESS_ONCE are not needed because we already have
the explicit surrounding memory barriers.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Mike Mason <mmlnx@us.ibm.com>
Cc: Dipankar Sarma <dipankar@in.ibm.com>
Cc: David Smith <dsmith@redhat.com>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Adrian Bunk <adrian.bunk@movial.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/kernel/marker.c b/kernel/marker.c
index ccae1d10e32f..041c33e3e95c 100644
--- a/kernel/marker.c
+++ b/kernel/marker.c
@@ -109,13 +109,13 @@ void marker_probe_cb(const struct marker *mdata, void *call_private,
          * modules and they insure RCU read coherency.
          */
         preempt_disable();
-        ptype = ACCESS_ONCE(mdata->ptype);
+        ptype = mdata->ptype;
         if (likely(!ptype)) {
                 marker_probe_func *func;
                 /* Must read the ptype before ptr. They are not data dependant,
                  * so we put an explicit smp_rmb() here. */
                 smp_rmb();
-                func = ACCESS_ONCE(mdata->single.func);
+                func = mdata->single.func;
                 /* Must read the ptr before private data. They are not data
                  * dependant, so we put an explicit smp_rmb() here. */
                 smp_rmb();
@@ -133,7 +133,7 @@ void marker_probe_cb(const struct marker *mdata, void *call_private,
                  * in the fast path, so put the explicit barrier here.
                  */
                 smp_read_barrier_depends();
-                multi = ACCESS_ONCE(mdata->multi);
+                multi = mdata->multi;
                 for (i = 0; multi[i].func; i++) {
                         va_start(args, fmt);
                         multi[i].func(multi[i].probe_private, call_private, fmt,
@@ -161,13 +161,13 @@ void marker_probe_cb_noarg(const struct marker *mdata,
         char ptype;
 
         preempt_disable();
-        ptype = ACCESS_ONCE(mdata->ptype);
+        ptype = mdata->ptype;
         if (likely(!ptype)) {
                 marker_probe_func *func;
                 /* Must read the ptype before ptr. They are not data dependant,
                  * so we put an explicit smp_rmb() here. */
                 smp_rmb();
-                func = ACCESS_ONCE(mdata->single.func);
+                func = mdata->single.func;
                 /* Must read the ptr before private data. They are not data
                  * dependant, so we put an explicit smp_rmb() here. */
                 smp_rmb();
@@ -183,7 +183,7 @@ void marker_probe_cb_noarg(const struct marker *mdata,
                  * in the fast path, so put the explicit barrier here.
                  */
                 smp_read_barrier_depends();
-                multi = ACCESS_ONCE(mdata->multi);
+                multi = mdata->multi;
                 for (i = 0; multi[i].func; i++)
                         multi[i].func(multi[i].probe_private, call_private, fmt,
                                 &args);