blktrace: mark ddir_act[] const

Impact: cleanup

ddir_act and what2act always stay immutable.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <49C89415.5080503@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 4 deletions

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 108f4f7715a5..1ffcbd4ac45b 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -147,8 +147,8 @@ static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
 /*
  * Data direction bit lookup
  */
-static u32 ddir_act[2] __read_mostly = { BLK_TC_ACT(BLK_TC_READ),
-                                         BLK_TC_ACT(BLK_TC_WRITE) };
+static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ),
+                                 BLK_TC_ACT(BLK_TC_WRITE) };
 
 /* The ilog2() calls fall out because they're constant */
 #define MASK_TC_BIT(rw, __name) ((rw & (1 << BIO_RW_ ## __name)) << \
@@ -1116,10 +1116,10 @@ static void blk_tracer_reset(struct trace_array *tr)
         blk_tracer_stop(tr);
 }
 
-static struct {
+static const struct {
         const char *act[2];
         int        (*print)(struct trace_seq *s, const struct trace_entry *ent);
-} what2act[] __read_mostly = {
+} what2act[] = {
         [__BLK_TA_QUEUE]        = {{  "Q", "queue" },      blk_log_generic },
         [__BLK_TA_BACKMERGE]    = {{  "M", "backmerge" },  blk_log_generic },
         [__BLK_TA_FRONTMERGE]   = {{  "F", "frontmerge" }, blk_log_generic },