diff options
| author | Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | 2008-07-30 18:20:05 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-08-01 12:43:11 -0700 |
| commit | 30812f838cde7347071b8119667ea9bb8623ee78 (patch) | |
| tree | 84603ed23b26b0056195a995076fb3d059e331c5 | |
| parent | a3676137382ae2dbc6a469ead4cd37ccf970aede (diff) | |
markers: fix markers read barrier for multiple probes
commit 5def9a3a22e09c99717f41ab7f07ec9e1a1f3ec8 upstream
Paul pointed out two incorrect read barriers in the marker handler code in
the path where multiple probes are connected. Those are ordering reads of
"ptype" (single or multi probe marker), "multi" array pointer, and "multi"
array data access.
It should be ordered like this :
read ptype
smp_rmb()
read multi array pointer
smp_read_barrier_depends()
access data referenced by multi array pointer
The code with a single probe connected (optimized case, does not have to
allocate an array) has correct memory ordering.
It applies to kernel 2.6.26.x, 2.6.25.x and linux-next.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | kernel/marker.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/kernel/marker.c b/kernel/marker.c index b5a9fe1d50d5..39e7596c3d95 100644 --- a/kernel/marker.c +++ b/kernel/marker.c @@ -127,6 +127,11 @@ void marker_probe_cb(const struct marker *mdata, void *call_private, struct marker_probe_closure *multi; int i; /* + * Read mdata->ptype before mdata->multi. + */ + smp_rmb(); + multi = mdata->multi; + /* * multi points to an array, therefore accessing the array * depends on reading multi. However, even in this case, * we must insure that the pointer is read _before_ the array @@ -134,7 +139,6 @@ 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 = mdata->multi; for (i = 0; multi[i].func; i++) { va_start(args, fmt); multi[i].func(multi[i].probe_private, call_private, fmt, @@ -177,6 +181,11 @@ void marker_probe_cb_noarg(const struct marker *mdata, struct marker_probe_closure *multi; int i; /* + * Read mdata->ptype before mdata->multi. + */ + smp_rmb(); + multi = mdata->multi; + /* * multi points to an array, therefore accessing the array * depends on reading multi. However, even in this case, * we must insure that the pointer is read _before_ the array @@ -184,7 +193,6 @@ void marker_probe_cb_noarg(const struct marker *mdata, * in the fast path, so put the explicit barrier here. */ smp_read_barrier_depends(); - multi = mdata->multi; for (i = 0; multi[i].func; i++) multi[i].func(multi[i].probe_private, call_private, fmt, &args); |