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| author | Liu Bo <bo.liu@linux.alibaba.com> | 2018-06-29 09:56:08 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-07-09 09:07:52 -0600 |
| commit | e1a413245a564683697a3d02ec197b72cf009b89 (patch) | |
| tree | 13f7fc57e754cd37e299f70158d8c5943d553718 /kernel/trace/blktrace.c | |
| parent | 1954e9a998d59d08520d7d4bebeafb8f66ba0d0f (diff) | |
| download | blackbird-op-linux-e1a413245a564683697a3d02ec197b72cf009b89.tar.gz blackbird-op-linux-e1a413245a564683697a3d02ec197b72cf009b89.zip | |
Blktrace: bail out early if block debugfs is not configured
Since @blk_debugfs_root couldn't be configured dynamically, we can
save a few memory allocation if it's not there.
Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'kernel/trace/blktrace.c')
| -rw-r--r-- | kernel/trace/blktrace.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 987d9a9ae283..b951aa1fac61 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -494,6 +494,9 @@ static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, if (!buts->buf_size || !buts->buf_nr) return -EINVAL; + if (!blk_debugfs_root) + return -ENOENT; + strncpy(buts->name, name, BLKTRACE_BDEV_SIZE); buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0'; @@ -518,9 +521,6 @@ static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, ret = -ENOENT; - if (!blk_debugfs_root) - goto err; - dir = debugfs_lookup(buts->name, blk_debugfs_root); if (!dir) bt->dir = dir = debugfs_create_dir(buts->name, blk_debugfs_root); |
