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| author | Ingo Molnar <mingo@kernel.org> | 2017-06-20 12:06:46 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-06-20 12:19:14 +0200 |
| commit | 2055da97389a605c8a00d163d40903afbe413921 (patch) | |
| tree | 6aec7243076aab2d4d239f03e34598752ce1512a /block/blk-wbt.c | |
| parent | 5822a454d6d22297c5fcd66264120587b2ec21cd (diff) | |
| download | linux-2055da97389a605c8a00d163d40903afbe413921.tar.bz2 | |
sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming
So I've noticed a number of instances where it was not obvious from the
code whether ->task_list was for a wait-queue head or a wait-queue entry.
Furthermore, there's a number of wait-queue users where the lists are
not for 'tasks' but other entities (poll tables, etc.), in which case
the 'task_list' name is actively confusing.
To clear this all up, name the wait-queue head and entry list structure
fields unambiguously:
struct wait_queue_head::task_list => ::head
struct wait_queue_entry::task_list => ::entry
For example, this code:
rqw->wait.task_list.next != &wait->task_list
... is was pretty unclear (to me) what it's doing, while now it's written this way:
rqw->wait.head.next != &wait->entry
... which makes it pretty clear that we are iterating a list until we see the head.
Other examples are:
list_for_each_entry_safe(pos, next, &x->task_list, task_list) {
list_for_each_entry(wq, &fence->wait.task_list, task_list) {
... where it's unclear (to me) what we are iterating, and during review it's
hard to tell whether it's trying to walk a wait-queue entry (which would be
a bug), while now it's written as:
list_for_each_entry_safe(pos, next, &x->head, entry) {
list_for_each_entry(wq, &fence->wait.head, entry) {
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'block/blk-wbt.c')
| -rw-r--r-- | block/blk-wbt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-wbt.c b/block/blk-wbt.c index 5f3a37c2784c..6a9a0f03a67b 100644 --- a/block/blk-wbt.c +++ b/block/blk-wbt.c @@ -520,7 +520,7 @@ static inline bool may_queue(struct rq_wb *rwb, struct rq_wait *rqw, * in line to be woken up, wait for our turn. */ if (waitqueue_active(&rqw->wait) && - rqw->wait.task_list.next != &wait->task_list) + rqw->wait.head.next != &wait->entry) return false; return atomic_inc_below(&rqw->inflight, get_limit(rwb, rw)); |