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authorIngo Molnar <mingo@kernel.org>2017-06-20 12:06:46 +0200
committerIngo Molnar <mingo@kernel.org>2017-06-20 12:19:14 +0200
commit2055da97389a605c8a00d163d40903afbe413921 (patch)
tree6aec7243076aab2d4d239f03e34598752ce1512a /block
parent5822a454d6d22297c5fcd66264120587b2ec21cd (diff)
downloadlinux-0-day-2055da97389a605c8a00d163d40903afbe413921.tar.gz
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')
-rw-r--r--block/blk-mq.c2
-rw-r--r--block/blk-wbt.c2
-rw-r--r--block/kyber-iosched.c8
3 files changed, 6 insertions, 6 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index a083f95..121aa1d 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -933,7 +933,7 @@ static int blk_mq_dispatch_wake(wait_queue_entry_t *wait, unsigned mode, int fla
hctx = container_of(wait, struct blk_mq_hw_ctx, dispatch_wait);
- list_del(&wait->task_list);
+ list_del(&wait->entry);
clear_bit_unlock(BLK_MQ_S_TAG_WAITING, &hctx->state);
blk_mq_run_hw_queue(hctx, true);
return 1;
diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index 5f3a37c..6a9a0f0 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));
diff --git a/block/kyber-iosched.c b/block/kyber-iosched.c
index b95d6bd..9bf1484 100644
--- a/block/kyber-iosched.c
+++ b/block/kyber-iosched.c
@@ -385,7 +385,7 @@ static int kyber_init_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx)
for (i = 0; i < KYBER_NUM_DOMAINS; i++) {
INIT_LIST_HEAD(&khd->rqs[i]);
- INIT_LIST_HEAD(&khd->domain_wait[i].task_list);
+ INIT_LIST_HEAD(&khd->domain_wait[i].entry);
atomic_set(&khd->wait_index[i], 0);
}
@@ -512,7 +512,7 @@ static int kyber_domain_wake(wait_queue_entry_t *wait, unsigned mode, int flags,
{
struct blk_mq_hw_ctx *hctx = READ_ONCE(wait->private);
- list_del_init(&wait->task_list);
+ list_del_init(&wait->entry);
blk_mq_run_hw_queue(hctx, true);
return 1;
}
@@ -536,7 +536,7 @@ static int kyber_get_domain_token(struct kyber_queue_data *kqd,
* run when one becomes available. Note that this is serialized on
* khd->lock, but we still need to be careful about the waker.
*/
- if (list_empty_careful(&wait->task_list)) {
+ if (list_empty_careful(&wait->entry)) {
init_waitqueue_func_entry(wait, kyber_domain_wake);
wait->private = hctx;
ws = sbq_wait_ptr(domain_tokens,
@@ -736,7 +736,7 @@ static int kyber_##name##_waiting_show(void *data, struct seq_file *m) \
struct kyber_hctx_data *khd = hctx->sched_data; \
wait_queue_entry_t *wait = &khd->domain_wait[domain]; \
\
- seq_printf(m, "%d\n", !list_empty_careful(&wait->task_list)); \
+ seq_printf(m, "%d\n", !list_empty_careful(&wait->entry)); \
return 0; \
}
KYBER_DEBUGFS_DOMAIN_ATTRS(KYBER_READ, read)