diff options
| author | Chen Gang <gang.chen@asianux.com> | 2013-11-03 18:23:39 +0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-11-08 20:04:30 +0400 |
| commit | f8c5e94486671ffcac696886c246baa6ba89b5cf (patch) | |
| tree | 9a4cf461b240740a0670cc364aec7851b3907ae1 | |
| parent | 6678d83f18386eb103f8345024e52c5abe61725c (diff) | |
| download | linux-f8c5e94486671ffcac696886c246baa6ba89b5cf.tar.xz | |
kernel: trace: blktrace: remove redundent memcpy() in compat_blk_trace_setup()
do_blk_trace_setup() will fully initialize 'buts.name', so can remove
the related memcpy(). And also use BLKTRACE_BDEV_SIZE and ARRAY_SIZE
instead of hard code number '32'.
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | include/linux/blktrace_api.h | 2 | ||||
| -rw-r--r-- | kernel/trace/blktrace.c | 3 |
2 files changed, 2 insertions, 3 deletions
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h index a12f6ed91c84..afc1343df3c7 100644 --- a/include/linux/blktrace_api.h +++ b/include/linux/blktrace_api.h @@ -89,7 +89,7 @@ static inline int blk_trace_init_sysfs(struct device *dev) #ifdef CONFIG_COMPAT struct compat_blk_user_trace_setup { - char name[32]; + char name[BLKTRACE_BDEV_SIZE]; u16 act_mask; u32 buf_size; u32 buf_nr; diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 7f727b34280d..f785aef65799 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -579,13 +579,12 @@ static int compat_blk_trace_setup(struct request_queue *q, char *name, .end_lba = cbuts.end_lba, .pid = cbuts.pid, }; - memcpy(&buts.name, &cbuts.name, 32); ret = do_blk_trace_setup(q, name, dev, bdev, &buts); if (ret) return ret; - if (copy_to_user(arg, &buts.name, 32)) { + if (copy_to_user(arg, &buts.name, ARRAY_SIZE(buts.name))) { blk_trace_remove(q); return -EFAULT; } |