* [PATCH v6] workqueue: Remove unnecessary kfree() call in rcu_free_wq()
@ 2020-05-28 1:37 qiang.zhang
2020-05-28 8:07 ` Markus Elfring
0 siblings, 1 reply; 3+ messages in thread
From: qiang.zhang @ 2020-05-28 1:37 UTC (permalink / raw)
To: tj; +Cc: jiangshanlai, markus.elfring, linux-kernel
From: Zhang Qiang <qiang.zhang@windriver.com>
The data structure member "wq->rescuer" was reset to a null pointer
in one if branch. It was passed to a call of the function "kfree"
in the callback function "rcu_free_wq" (which was eventually executed).
The function "kfree" does not perform more meaningful data processing
for a passed null pointer (besides immediately returning from such a call).
Thus delete this function call which became unnecessary with the referenced
software update.
Fixes: def98c84b6cd ("workqueue: Fix spurious sanity check failures in destroy_workqueue()")
Co-developed-by: Markus Elfring <Markus.Elfring@web.de>
Signed-off-by: Zhang Qiang <qiang.zhang@windriver.com>
---
v1->v2->v3->v4->v5->v6:
Modify weakly submitted information and tag.
kernel/workqueue.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 891ccad5f271..a2451cdcd503 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3491,7 +3491,6 @@ static void rcu_free_wq(struct rcu_head *rcu)
else
free_workqueue_attrs(wq->unbound_attrs);
- kfree(wq->rescuer);
kfree(wq);
}
--
2.24.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v6] workqueue: Remove unnecessary kfree() call in rcu_free_wq()
2020-05-28 1:37 [PATCH v6] workqueue: Remove unnecessary kfree() call in rcu_free_wq() qiang.zhang
@ 2020-05-28 8:07 ` Markus Elfring
0 siblings, 0 replies; 3+ messages in thread
From: Markus Elfring @ 2020-05-28 8:07 UTC (permalink / raw)
To: Zhang Qiang, Tejun Heo, Lai Jiangshan; +Cc: linux-kernel, kernel-janitors
> Thus delete this function call which became unnecessary with the referenced
> software update.
…
> Co-developed-by: Markus Elfring <Markus.Elfring@web.de>
I guess that this tag should usually trigger another consequence like the following.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=b0c3ba31be3e45a130e13b278cf3b90f69bda6f6#n548
Signed-off-by: Markus Elfring <Markus.Elfring@web.de>
Is there a need to tag also the patch review contribution of Lai Jiangshan?
https://lore.kernel.org/lkml/CAJhGHyC4XcNL8yzWZKZ=73wZJej4JwCaAHGV8qjYn-AqcEAEjQ@mail.gmail.com/
https://lore.kernel.org/patchwork/comment/1442889/
https://lkml.org/lkml/2020/5/26/201
I am unsure if such aspects will matter after Tejun Heo responded with the information
“Applied to wq/for-5.8.” to the previous patch version yesterday.
https://lore.kernel.org/lkml/20200527135214.GI83516@mtj.thefacebook.com/
https://lore.kernel.org/patchwork/comment/1443888/
> v1->v2->v3->v4->v5->v6:
> Modify weakly submitted information and tag.
I am curious how our imaginations and preferences will evolve further
also for such wording selections.
Regards,
Markus
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v6] workqueue: Remove unnecessary kfree() call in rcu_free_wq()
@ 2020-05-28 8:07 ` Markus Elfring
0 siblings, 0 replies; 3+ messages in thread
From: Markus Elfring @ 2020-05-28 8:07 UTC (permalink / raw)
To: Zhang Qiang, Tejun Heo, Lai Jiangshan; +Cc: linux-kernel, kernel-janitors
> Thus delete this function call which became unnecessary with the referenced
> software update.
…
> Co-developed-by: Markus Elfring <Markus.Elfring@web.de>
I guess that this tag should usually trigger another consequence like the following.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=b0c3ba31be3e45a130e13b278cf3b90f69bda6f6#n548
Signed-off-by: Markus Elfring <Markus.Elfring@web.de>
Is there a need to tag also the patch review contribution of Lai Jiangshan?
https://lore.kernel.org/lkml/CAJhGHyC4XcNL8yzWZKZ=73wZJej4JwCaAHGV8qjYn-AqcEAEjQ@mail.gmail.com/
https://lore.kernel.org/patchwork/comment/1442889/
https://lkml.org/lkml/2020/5/26/201
I am unsure if such aspects will matter after Tejun Heo responded with the information
“Applied to wq/for-5.8.” to the previous patch version yesterday.
https://lore.kernel.org/lkml/20200527135214.GI83516@mtj.thefacebook.com/
https://lore.kernel.org/patchwork/comment/1443888/
> v1->v2->v3->v4->v5->v6:
> Modify weakly submitted information and tag.
I am curious how our imaginations and preferences will evolve further
also for such wording selections.
Regards,
Markus
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2020-05-28 8:08 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2020-05-28 1:37 [PATCH v6] workqueue: Remove unnecessary kfree() call in rcu_free_wq() qiang.zhang
2020-05-28 8:07 ` Markus Elfring
2020-05-28 8:07 ` Markus Elfring
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