From: kernel test robot <lkp(a)intel.com&gt; drivers/md/bcache/btree.c:1810:1-3: WARNING: PTR_ERR_OR_ZERO can be used Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR Generated by: scripts/coccinelle/api/ptr_ret.cocci Fixes: 1898b575e1d4 ("bcache: Make gc wakeup sane, remove set_task_state()") CC: Kent Overstreet <kent.overstreet(a)gmail.com&gt; Signed-off-by: kernel test robot <lkp(a)intel.com&gt; --- tree: https://android.googlesource.com/kernel/goldfish android-3.18 head: 1898b575e1d49f3c959d792fa32168cde137b7c7 commit: 1898b575e1d49f3c959d792fa32168cde137b7c7 [18/18] bcache: Make gc wakeup sane, remove set_task_state() btree.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -1807,10 +1807,7 @@ static int bch_gc_thread(void *arg) int bch_gc_thread_start(struct cache_set *c) { c->gc_thread = kthread_run(bch_gc_thread, c, "bcache_gc"); - if (IS_ERR(c->gc_thread)) - return PTR_ERR(c->gc_thread); - - return 0; + return PTR_ERR_OR_ZERO(c->gc_thread); } /* Initial partial gc */