* [PATCH v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()
@ 2021-08-31 2:29 qiang.zhang
2021-09-07 1:29 ` Zhang, Qiang
2021-09-08 1:17 ` Steven Rostedt
0 siblings, 2 replies; 6+ messages in thread
From: qiang.zhang @ 2021-08-31 2:29 UTC (permalink / raw)
To: bristot, rostedt, bristot, mingo; +Cc: linux-kernel
From: "Qiang.Zhang" <qiang.zhang@windriver.com>
When start_kthread() return error, the cpus_read_unlock() need
to be called.
Fixes: c8895e271f79 ("trace/osnoise: Support hotplug operations")
Cc: <stable@vger.kernel.org> # v5.14+
Signed-off-by: Qiang.Zhang <qiang.zhang@windriver.com>
---
v1->v2:
Modify submission information and code style, add tags.
kernel/trace/trace_osnoise.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 65b08b8e5bf8..ce053619f289 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1548,7 +1548,7 @@ static int start_kthread(unsigned int cpu)
static int start_per_cpu_kthreads(struct trace_array *tr)
{
struct cpumask *current_mask = &save_cpumask;
- int retval;
+ int retval = 0;
int cpu;
cpus_read_lock();
@@ -1568,13 +1568,13 @@ static int start_per_cpu_kthreads(struct trace_array *tr)
retval = start_kthread(cpu);
if (retval) {
stop_per_cpu_kthreads();
- return retval;
+ break;
}
}
cpus_read_unlock();
- return 0;
+ return retval;
}
#ifdef CONFIG_HOTPLUG_CPU
--
2.17.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()
2021-08-31 2:29 [PATCH v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads() qiang.zhang
@ 2021-09-07 1:29 ` Zhang, Qiang
2021-09-08 1:17 ` Steven Rostedt
1 sibling, 0 replies; 6+ messages in thread
From: Zhang, Qiang @ 2021-09-07 1:29 UTC (permalink / raw)
To: bristot, rostedt, bristot, mingo; +Cc: linux-kernel
Hi Daniel
Do you have time to review this modification?
Thanks
Qiang.zhang
________________________________________
From: Zhang, Qiang <qiang.zhang@windriver.com>
Sent: Tuesday, 31 August 2021 10:28
To: bristot@redhat.com; rostedt@goodmis.org; bristot@kernel.org; mingo@redhat.com
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()
From: "Qiang.Zhang" <qiang.zhang@windriver.com>
When start_kthread() return error, the cpus_read_unlock() need
to be called.
Fixes: c8895e271f79 ("trace/osnoise: Support hotplug operations")
Cc: <stable@vger.kernel.org> # v5.14+
Signed-off-by: Qiang.Zhang <qiang.zhang@windriver.com>
---
v1->v2:
Modify submission information and code style, add tags.
kernel/trace/trace_osnoise.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 65b08b8e5bf8..ce053619f289 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1548,7 +1548,7 @@ static int start_kthread(unsigned int cpu)
static int start_per_cpu_kthreads(struct trace_array *tr)
{
struct cpumask *current_mask = &save_cpumask;
- int retval;
+ int retval = 0;
int cpu;
cpus_read_lock();
@@ -1568,13 +1568,13 @@ static int start_per_cpu_kthreads(struct trace_array *tr)
retval = start_kthread(cpu);
if (retval) {
stop_per_cpu_kthreads();
- return retval;
+ break;
}
}
cpus_read_unlock();
- return 0;
+ return retval;
}
#ifdef CONFIG_HOTPLUG_CPU
--
2.17.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()
2021-08-31 2:29 [PATCH v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads() qiang.zhang
2021-09-07 1:29 ` Zhang, Qiang
@ 2021-09-08 1:17 ` Steven Rostedt
2021-09-08 2:34 ` Zhang, Qiang
1 sibling, 1 reply; 6+ messages in thread
From: Steven Rostedt @ 2021-09-08 1:17 UTC (permalink / raw)
To: qiang.zhang; +Cc: bristot, bristot, mingo, linux-kernel
On Tue, 31 Aug 2021 10:29:19 +0800
qiang.zhang@windriver.com wrote:
> From: "Qiang.Zhang" <qiang.zhang@windriver.com>
>
> When start_kthread() return error, the cpus_read_unlock() need
> to be called.
>
> Fixes: c8895e271f79 ("trace/osnoise: Support hotplug operations")
> Cc: <stable@vger.kernel.org> # v5.14+
FYI, no need to add the "# v5.14+", as it also breaks my scripts. The
"Fixes:" tag is now used to know what stable releases it needs to be
applied to (if any).
Daniel, that goes for you too, as you suggested it ;-)
-- Steve
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()
2021-09-08 1:17 ` Steven Rostedt
@ 2021-09-08 2:34 ` Zhang, Qiang
2021-09-08 2:55 ` Steven Rostedt
0 siblings, 1 reply; 6+ messages in thread
From: Zhang, Qiang @ 2021-09-08 2:34 UTC (permalink / raw)
To: Steven Rostedt; +Cc: bristot, bristot, mingo, linux-kernel
________________________________________
From: Steven Rostedt <rostedt@goodmis.org>
Sent: Wednesday, 8 September 2021 09:17
To: Zhang, Qiang
Cc: bristot@redhat.com; bristot@kernel.org; mingo@redhat.com; linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()
[Please note: This e-mail is from an EXTERNAL e-mail address]
On Tue, 31 Aug 2021 10:29:19 +0800
qiang.zhang@windriver.com wrote:
> From: "Qiang.Zhang" <qiang.zhang@windriver.com>
>
> When start_kthread() return error, the cpus_read_unlock() need
> to be called.
>
> Fixes: c8895e271f79 ("trace/osnoise: Support hotplug operations")
> Cc: <stable@vger.kernel.org> # v5.14+
>FYI, no need to add the "# v5.14+", as it also breaks my scripts. The
>"Fixes:" tag is now used to know what stable releases it needs to be
>applied to (if any).
>
Thanks Steve
I will resend v3.
>Daniel, that goes for you too, as you suggested it ;-)
>
>-- Steve
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()
2021-09-08 2:34 ` Zhang, Qiang
@ 2021-09-08 2:55 ` Steven Rostedt
2021-09-08 10:15 ` Daniel Bristot de Oliveira
0 siblings, 1 reply; 6+ messages in thread
From: Steven Rostedt @ 2021-09-08 2:55 UTC (permalink / raw)
To: Zhang, Qiang; +Cc: bristot, bristot, mingo, linux-kernel
On Wed, 8 Sep 2021 02:34:46 +0000
"Zhang, Qiang" <Qiang.Zhang@windriver.com> wrote:
> >FYI, no need to add the "# v5.14+", as it also breaks my scripts. The
> >"Fixes:" tag is now used to know what stable releases it needs to be
> >applied to (if any).
> >
> Thanks Steve
> I will resend v3.
>
No need. I fixed it. I'll add Daniel's reviewed by if he gives one.
I'm currently running it through my test suite (with several other patches).
-- Steve
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()
2021-09-08 2:55 ` Steven Rostedt
@ 2021-09-08 10:15 ` Daniel Bristot de Oliveira
0 siblings, 0 replies; 6+ messages in thread
From: Daniel Bristot de Oliveira @ 2021-09-08 10:15 UTC (permalink / raw)
To: Steven Rostedt, Zhang, Qiang; +Cc: bristot, mingo, linux-kernel
On 9/8/21 4:55 AM, Steven Rostedt wrote:
> On Wed, 8 Sep 2021 02:34:46 +0000
> "Zhang, Qiang" <Qiang.Zhang@windriver.com> wrote:
>
>>> FYI, no need to add the "# v5.14+", as it also breaks my scripts. The
>>> "Fixes:" tag is now used to know what stable releases it needs to be
>>> applied to (if any).
>>>
>> Thanks Steve
>> I will resend v3.
>>
>
> No need. I fixed it. I'll add Daniel's reviewed by if he gives one.
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
-- Daniel
> I'm currently running it through my test suite (with several other patches).
>
> -- Steve
>
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-09-08 10:15 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2021-08-31 2:29 [PATCH v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads() qiang.zhang
2021-09-07 1:29 ` Zhang, Qiang
2021-09-08 1:17 ` Steven Rostedt
2021-09-08 2:34 ` Zhang, Qiang
2021-09-08 2:55 ` Steven Rostedt
2021-09-08 10:15 ` Daniel Bristot de Oliveira
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