From 58336114af4d2cce830201aae49e50b93ede6c5c Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Mon, 24 Mar 2008 12:29:49 -0700 Subject: [PATCH] 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 Cc: Christoph Hellwig Cc: Mike Mason Cc: Dipankar Sarma Cc: David Smith Cc: "Paul E. McKenney" Cc: Steven Rostedt Cc: Adrian Bunk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/marker.c | 12 ++++++------ 1 file 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); -- 2.20.1