* [PATCH v2] ppc: cpufreq: disable preemption while checking CPU throttling state
@ 2016-11-04 11:08 Denis Kirjanov
2016-11-07 2:31 ` Gautham R Shenoy
2016-11-07 7:36 ` Michael Ellerman
0 siblings, 2 replies; 8+ messages in thread
From: Denis Kirjanov @ 2016-11-04 11:08 UTC (permalink / raw)
To: linuxppc-dev; +Cc: ego, Denis Kirjanov
[ 67.700897] BUG: using smp_processor_id() in preemptible [00000000] code: cat/7343
[ 67.700988] caller is .powernv_cpufreq_throttle_check+0x2c/0x710
[ 67.700998] CPU: 13 PID: 7343 Comm: cat Not tainted 4.8.0-rc5-dirty #1
[ 67.701038] Call Trace:
[ 67.701066] [c0000007d25b75b0] [c000000000971378] .dump_stack+0xe4/0x150 (unreliable)
[ 67.701153] [c0000007d25b7640] [c0000000005162e4] .check_preemption_disabled+0x134/0x150
[ 67.701238] [c0000007d25b76e0] [c0000000007b63ac] .powernv_cpufreq_throttle_check+0x2c/0x710
[ 67.701322] [c0000007d25b7790] [c0000000007b6d18] .powernv_cpufreq_target_index+0x288/0x360
[ 67.701407] [c0000007d25b7870] [c0000000007acee4] .__cpufreq_driver_target+0x394/0x8c0
[ 67.701491] [c0000007d25b7920] [c0000000007b22ac] .cpufreq_set+0x7c/0xd0
[ 67.701565] [c0000007d25b79b0] [c0000000007adf50] .store_scaling_setspeed+0x80/0xc0
[ 67.701650] [c0000007d25b7a40] [c0000000007ae270] .store+0xa0/0x100
[ 67.701723] [c0000007d25b7ae0] [c0000000003566e8] .sysfs_kf_write+0x88/0xb0
[ 67.701796] [c0000007d25b7b70] [c0000000003553b8] .kernfs_fop_write+0x178/0x260
[ 67.701881] [c0000007d25b7c10] [c0000000002ac3cc] .__vfs_write+0x3c/0x1c0
[ 67.701954] [c0000007d25b7cf0] [c0000000002ad584] .vfs_write+0xc4/0x230
[ 67.702027] [c0000007d25b7d90] [c0000000002aeef8] .SyS_write+0x58/0x100
[ 67.702101] [c0000007d25b7e30] [c00000000000bfec] system_call+0x38/0xfc
Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
v2: wrap powernv_cpufreq_throttle_check()
as suggested by Gautham R Shenoy
---
drivers/cpufreq/powernv-cpufreq.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
index d3ffde8..112e0e2 100644
--- a/drivers/cpufreq/powernv-cpufreq.c
+++ b/drivers/cpufreq/powernv-cpufreq.c
@@ -647,8 +647,15 @@ static int powernv_cpufreq_target_index(struct cpufreq_policy *policy,
if (unlikely(rebooting) && new_index != get_nominal_index())
return 0;
- if (!throttled)
+ if (!throttled) {
+ /*
+ * we don't want to be preempted while
+ * checking if the CPU frequency has been throttled
+ */
+ preempt_disable();
powernv_cpufreq_throttle_check(NULL);
+ preempt_enable();
+ }
cur_msec = jiffies_to_msecs(get_jiffies_64());
--
1.8.3.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH v2] ppc: cpufreq: disable preemption while checking CPU throttling state
2016-11-04 11:08 [PATCH v2] ppc: cpufreq: disable preemption while checking CPU throttling state Denis Kirjanov
@ 2016-11-07 2:31 ` Gautham R Shenoy
2016-11-07 5:15 ` Denis Kirjanov
2016-11-07 7:36 ` Michael Ellerman
1 sibling, 1 reply; 8+ messages in thread
From: Gautham R Shenoy @ 2016-11-07 2:31 UTC (permalink / raw)
To: Denis Kirjanov; +Cc: linuxppc-dev, ego
Hi Denis,
On Fri, Nov 04, 2016 at 07:08:38AM -0400, Denis Kirjanov wrote:
You can provide the config option with which this bug was found in the
change log. I suppose you had enabled CONFIG_DEBUG_PREEMPT.
> [ 67.700897] BUG: using smp_processor_id() in preemptible [00000000] code: cat/7343
> [ 67.700988] caller is .powernv_cpufreq_throttle_check+0x2c/0x710
> [ 67.700998] CPU: 13 PID: 7343 Comm: cat Not tainted 4.8.0-rc5-dirty #1
> [ 67.701038] Call Trace:
> [ 67.701066] [c0000007d25b75b0] [c000000000971378] .dump_stack+0xe4/0x150 (unreliable)
> [ 67.701153] [c0000007d25b7640] [c0000000005162e4] .check_preemption_disabled+0x134/0x150
> [ 67.701238] [c0000007d25b76e0] [c0000000007b63ac] .powernv_cpufreq_throttle_check+0x2c/0x710
> [ 67.701322] [c0000007d25b7790] [c0000000007b6d18] .powernv_cpufreq_target_index+0x288/0x360
> [ 67.701407] [c0000007d25b7870] [c0000000007acee4] .__cpufreq_driver_target+0x394/0x8c0
> [ 67.701491] [c0000007d25b7920] [c0000000007b22ac] .cpufreq_set+0x7c/0xd0
> [ 67.701565] [c0000007d25b79b0] [c0000000007adf50] .store_scaling_setspeed+0x80/0xc0
> [ 67.701650] [c0000007d25b7a40] [c0000000007ae270] .store+0xa0/0x100
> [ 67.701723] [c0000007d25b7ae0] [c0000000003566e8] .sysfs_kf_write+0x88/0xb0
> [ 67.701796] [c0000007d25b7b70] [c0000000003553b8] .kernfs_fop_write+0x178/0x260
> [ 67.701881] [c0000007d25b7c10] [c0000000002ac3cc] .__vfs_write+0x3c/0x1c0
> [ 67.701954] [c0000007d25b7cf0] [c0000000002ad584] .vfs_write+0xc4/0x230
> [ 67.702027] [c0000007d25b7d90] [c0000000002aeef8] .SyS_write+0x58/0x100
> [ 67.702101] [c0000007d25b7e30] [c00000000000bfec] system_call+0x38/0xfc
>
> Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
>
> v2: wrap powernv_cpufreq_throttle_check()
> as suggested by Gautham R Shenoy
Looks good otherwise.
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
> ---
> drivers/cpufreq/powernv-cpufreq.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c
> index d3ffde8..112e0e2 100644
> --- a/drivers/cpufreq/powernv-cpufreq.c
> +++ b/drivers/cpufreq/powernv-cpufreq.c
> @@ -647,8 +647,15 @@ static int powernv_cpufreq_target_index(struct cpufreq_policy *policy,
> if (unlikely(rebooting) && new_index != get_nominal_index())
> return 0;
>
> - if (!throttled)
> + if (!throttled) {
> + /*
> + * we don't want to be preempted while
> + * checking if the CPU frequency has been throttled
> + */
> + preempt_disable();
> powernv_cpufreq_throttle_check(NULL);
> + preempt_enable();
> + }
>
> cur_msec = jiffies_to_msecs(get_jiffies_64());
>
> --
> 1.8.3.1
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2] ppc: cpufreq: disable preemption while checking CPU throttling state
2016-11-07 2:31 ` Gautham R Shenoy
@ 2016-11-07 5:15 ` Denis Kirjanov
0 siblings, 0 replies; 8+ messages in thread
From: Denis Kirjanov @ 2016-11-07 5:15 UTC (permalink / raw)
To: ego@linux.vnet.ibm.com; +Cc: linuxppc-dev@lists.ozlabs.org
[-- Attachment #1: Type: text/plain, Size: 3175 bytes --]
On Monday, November 7, 2016, Gautham R Shenoy <ego@linux.vnet.ibm.com>
wrote:
> Hi Denis,
>
> On Fri, Nov 04, 2016 at 07:08:38AM -0400, Denis Kirjanov wrote:
>
> You can provide the config option with which this bug was found in the
> change log. I suppose you had enabled CONFIG_DEBUG_PREEMPT.
>
>
that's why I put the comment
> > [ 67.700897] BUG: using smp_processor_id() in preemptible
> [00000000] code: cat/7343
> > [ 67.700988] caller is .powernv_cpufreq_throttle_check+0x2c/0x710
> > [ 67.700998] CPU: 13 PID: 7343 Comm: cat Not tainted
> 4.8.0-rc5-dirty #1
> > [ 67.701038] Call Trace:
> > [ 67.701066] [c0000007d25b75b0] [c000000000971378]
> .dump_stack+0xe4/0x150 (unreliable)
> > [ 67.701153] [c0000007d25b7640] [c0000000005162e4]
> .check_preemption_disabled+0x134/0x150
> > [ 67.701238] [c0000007d25b76e0] [c0000000007b63ac]
> .powernv_cpufreq_throttle_check+0x2c/0x710
> > [ 67.701322] [c0000007d25b7790] [c0000000007b6d18]
> .powernv_cpufreq_target_index+0x288/0x360
> > [ 67.701407] [c0000007d25b7870] [c0000000007acee4]
> .__cpufreq_driver_target+0x394/0x8c0
> > [ 67.701491] [c0000007d25b7920] [c0000000007b22ac]
> .cpufreq_set+0x7c/0xd0
> > [ 67.701565] [c0000007d25b79b0] [c0000000007adf50]
> .store_scaling_setspeed+0x80/0xc0
> > [ 67.701650] [c0000007d25b7a40] [c0000000007ae270]
> .store+0xa0/0x100
> > [ 67.701723] [c0000007d25b7ae0] [c0000000003566e8]
> .sysfs_kf_write+0x88/0xb0
> > [ 67.701796] [c0000007d25b7b70] [c0000000003553b8]
> .kernfs_fop_write+0x178/0x260
> > [ 67.701881] [c0000007d25b7c10] [c0000000002ac3cc]
> .__vfs_write+0x3c/0x1c0
> > [ 67.701954] [c0000007d25b7cf0] [c0000000002ad584]
> .vfs_write+0xc4/0x230
> > [ 67.702027] [c0000007d25b7d90] [c0000000002aeef8]
> .SyS_write+0x58/0x100
> > [ 67.702101] [c0000007d25b7e30] [c00000000000bfec]
> system_call+0x38/0xfc
> >
> > Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org <javascript:;>>
> >
> > v2: wrap powernv_cpufreq_throttle_check()
> > as suggested by Gautham R Shenoy
>
> Looks good otherwise.
>
> Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com <javascript:;>>
>
> > ---
> > drivers/cpufreq/powernv-cpufreq.c | 9 ++++++++-
> > 1 file changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/cpufreq/powernv-cpufreq.c
> b/drivers/cpufreq/powernv-cpufreq.c
> > index d3ffde8..112e0e2 100644
> > --- a/drivers/cpufreq/powernv-cpufreq.c
> > +++ b/drivers/cpufreq/powernv-cpufreq.c
> > @@ -647,8 +647,15 @@ static int powernv_cpufreq_target_index(struct
> cpufreq_policy *policy,
> > if (unlikely(rebooting) && new_index != get_nominal_index())
> > return 0;
> >
> > - if (!throttled)
> > + if (!throttled) {
> > + /*
> > + * we don't want to be preempted while
> > + * checking if the CPU frequency has been throttled
> > + */
> > + preempt_disable();
> > powernv_cpufreq_throttle_check(NULL);
> > + preempt_enable();
> > + }
> >
> > cur_msec = jiffies_to_msecs(get_jiffies_64());
> >
> > --
> > 1.8.3.1
> >
>
>
[-- Attachment #2: Type: text/html, Size: 4243 bytes --]
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2] ppc: cpufreq: disable preemption while checking CPU throttling state
2016-11-04 11:08 [PATCH v2] ppc: cpufreq: disable preemption while checking CPU throttling state Denis Kirjanov
2016-11-07 2:31 ` Gautham R Shenoy
@ 2016-11-07 7:36 ` Michael Ellerman
2016-11-07 8:02 ` Denis Kirjanov
1 sibling, 1 reply; 8+ messages in thread
From: Michael Ellerman @ 2016-11-07 7:36 UTC (permalink / raw)
To: Denis Kirjanov, linuxppc-dev; +Cc: ego, Denis Kirjanov
Denis Kirjanov <kda@linux-powerpc.org> writes:
> [ 67.700897] BUG: using smp_processor_id() in preemptible [00000000] code: cat/7343
> [ 67.700988] caller is .powernv_cpufreq_throttle_check+0x2c/0x710
> [ 67.700998] CPU: 13 PID: 7343 Comm: cat Not tainted 4.8.0-rc5-dirty #1
> [ 67.701038] Call Trace:
> [ 67.701066] [c0000007d25b75b0] [c000000000971378] .dump_stack+0xe4/0x150 (unreliable)
> [ 67.701153] [c0000007d25b7640] [c0000000005162e4] .check_preemption_disabled+0x134/0x150
> [ 67.701238] [c0000007d25b76e0] [c0000000007b63ac] .powernv_cpufreq_throttle_check+0x2c/0x710
> [ 67.701322] [c0000007d25b7790] [c0000000007b6d18] .powernv_cpufreq_target_index+0x288/0x360
> [ 67.701407] [c0000007d25b7870] [c0000000007acee4] .__cpufreq_driver_target+0x394/0x8c0
> [ 67.701491] [c0000007d25b7920] [c0000000007b22ac] .cpufreq_set+0x7c/0xd0
> [ 67.701565] [c0000007d25b79b0] [c0000000007adf50] .store_scaling_setspeed+0x80/0xc0
> [ 67.701650] [c0000007d25b7a40] [c0000000007ae270] .store+0xa0/0x100
> [ 67.701723] [c0000007d25b7ae0] [c0000000003566e8] .sysfs_kf_write+0x88/0xb0
> [ 67.701796] [c0000007d25b7b70] [c0000000003553b8] .kernfs_fop_write+0x178/0x260
> [ 67.701881] [c0000007d25b7c10] [c0000000002ac3cc] .__vfs_write+0x3c/0x1c0
> [ 67.701954] [c0000007d25b7cf0] [c0000000002ad584] .vfs_write+0xc4/0x230
> [ 67.702027] [c0000007d25b7d90] [c0000000002aeef8] .SyS_write+0x58/0x100
> [ 67.702101] [c0000007d25b7e30] [c00000000000bfec] system_call+0x38/0xfc
>
> Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
>
> v2: wrap powernv_cpufreq_throttle_check()
> as suggested by Gautham R Shenoy
That should be below the "---".
When did this break?
cheers
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2] ppc: cpufreq: disable preemption while checking CPU throttling state
2016-11-07 7:36 ` Michael Ellerman
@ 2016-11-07 8:02 ` Denis Kirjanov
2016-11-08 0:21 ` Michael Ellerman
0 siblings, 1 reply; 8+ messages in thread
From: Denis Kirjanov @ 2016-11-07 8:02 UTC (permalink / raw)
To: Michael Ellerman; +Cc: linuxppc-dev, ego
On 11/7/16, Michael Ellerman <mpe@ellerman.id.au> wrote:
> Denis Kirjanov <kda@linux-powerpc.org> writes:
>
>> [ 67.700897] BUG: using smp_processor_id() in preemptible [00000000]
>> code: cat/7343
>> [ 67.700988] caller is .powernv_cpufreq_throttle_check+0x2c/0x710
>> [ 67.700998] CPU: 13 PID: 7343 Comm: cat Not tainted 4.8.0-rc5-dirty
>> #1
>> [ 67.701038] Call Trace:
>> [ 67.701066] [c0000007d25b75b0] [c000000000971378]
>> .dump_stack+0xe4/0x150 (unreliable)
>> [ 67.701153] [c0000007d25b7640] [c0000000005162e4]
>> .check_preemption_disabled+0x134/0x150
>> [ 67.701238] [c0000007d25b76e0] [c0000000007b63ac]
>> .powernv_cpufreq_throttle_check+0x2c/0x710
>> [ 67.701322] [c0000007d25b7790] [c0000000007b6d18]
>> .powernv_cpufreq_target_index+0x288/0x360
>> [ 67.701407] [c0000007d25b7870] [c0000000007acee4]
>> .__cpufreq_driver_target+0x394/0x8c0
>> [ 67.701491] [c0000007d25b7920] [c0000000007b22ac]
>> .cpufreq_set+0x7c/0xd0
>> [ 67.701565] [c0000007d25b79b0] [c0000000007adf50]
>> .store_scaling_setspeed+0x80/0xc0
>> [ 67.701650] [c0000007d25b7a40] [c0000000007ae270]
>> .store+0xa0/0x100
>> [ 67.701723] [c0000007d25b7ae0] [c0000000003566e8]
>> .sysfs_kf_write+0x88/0xb0
>> [ 67.701796] [c0000007d25b7b70] [c0000000003553b8]
>> .kernfs_fop_write+0x178/0x260
>> [ 67.701881] [c0000007d25b7c10] [c0000000002ac3cc]
>> .__vfs_write+0x3c/0x1c0
>> [ 67.701954] [c0000007d25b7cf0] [c0000000002ad584]
>> .vfs_write+0xc4/0x230
>> [ 67.702027] [c0000007d25b7d90] [c0000000002aeef8]
>> .SyS_write+0x58/0x100
>> [ 67.702101] [c0000007d25b7e30] [c00000000000bfec]
>> system_call+0x38/0xfc
>>
>> Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
>>
>> v2: wrap powernv_cpufreq_throttle_check()
>> as suggested by Gautham R Shenoy
>
> That should be below the "---".
>
> When did this break?
I think that problem exists since commit
09a972d1620934142d30cfda455ffe429af751c4 ("cpufreq: powernv: Report
cpu frequency throttling") but I can be wrong
>
> cheers
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2] ppc: cpufreq: disable preemption while checking CPU throttling state
2016-11-07 8:02 ` Denis Kirjanov
@ 2016-11-08 0:21 ` Michael Ellerman
2016-11-08 3:17 ` Gautham R Shenoy
0 siblings, 1 reply; 8+ messages in thread
From: Michael Ellerman @ 2016-11-08 0:21 UTC (permalink / raw)
To: Denis Kirjanov; +Cc: linuxppc-dev, ego
Denis Kirjanov <kda@linux-powerpc.org> writes:
> On 11/7/16, Michael Ellerman <mpe@ellerman.id.au> wrote:
>> Denis Kirjanov <kda@linux-powerpc.org> writes:
>>> [ 67.700897] BUG: using smp_processor_id() in preemptible [00000000] code: cat/7343
>>> [ 67.700988] caller is .powernv_cpufreq_throttle_check+0x2c/0x710
>>
>> When did this break?
>
> I think that problem exists since commit
> 09a972d1620934142d30cfda455ffe429af751c4 ("cpufreq: powernv: Report
> cpu frequency throttling") but I can be wrong
Yep that looks right to me, thanks.
Gautham, how bad is the bug here, do we want to send this to stable?
cheers
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2] ppc: cpufreq: disable preemption while checking CPU throttling state
2016-11-08 0:21 ` Michael Ellerman
@ 2016-11-08 3:17 ` Gautham R Shenoy
2016-11-08 8:27 ` Michael Ellerman
0 siblings, 1 reply; 8+ messages in thread
From: Gautham R Shenoy @ 2016-11-08 3:17 UTC (permalink / raw)
To: Michael Ellerman
Cc: Denis Kirjanov, linuxppc-dev, ego, Shilpasri G Bhat, Akshay Adiga
Hi Michael,
On Tue, Nov 08, 2016 at 11:21:23AM +1100, Michael Ellerman wrote:
> Denis Kirjanov <kda@linux-powerpc.org> writes:
> > On 11/7/16, Michael Ellerman <mpe@ellerman.id.au> wrote:
> >> Denis Kirjanov <kda@linux-powerpc.org> writes:
> >>> [ 67.700897] BUG: using smp_processor_id() in preemptible [00000000] code: cat/7343
> >>> [ 67.700988] caller is .powernv_cpufreq_throttle_check+0x2c/0x710
> >>
> >> When did this break?
> >
> > I think that problem exists since commit
> > 09a972d1620934142d30cfda455ffe429af751c4 ("cpufreq: powernv: Report
> > cpu frequency throttling") but I can be wrong
>
> Yep that looks right to me, thanks.
>
> Gautham, how bad is the bug here, do we want to send this to stable?
Not so bad that it needs to be sent to stable immediately.
On CONFIG_PREEMPT enabled systems, if task executing
powernv_cpufreq_throttle_check can be switched to a CPU on a different
chip, then we will end up incorrectly attributing the throttle
statistics of the new chip to the chip where it previously ran. These
throttle statistics aren't used inside the kernel for any computation,
but are reported to the user via /sysfs for them to account for any
variance during a benchmark run.
It would be good to include this in the 4.9 fixes though.
>
> cheers
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2] ppc: cpufreq: disable preemption while checking CPU throttling state
2016-11-08 3:17 ` Gautham R Shenoy
@ 2016-11-08 8:27 ` Michael Ellerman
0 siblings, 0 replies; 8+ messages in thread
From: Michael Ellerman @ 2016-11-08 8:27 UTC (permalink / raw)
To: Gautham R Shenoy
Cc: Denis Kirjanov, linuxppc-dev, ego, Shilpasri G Bhat, Akshay Adiga
Gautham R Shenoy <ego@linux.vnet.ibm.com> writes:
> On Tue, Nov 08, 2016 at 11:21:23AM +1100, Michael Ellerman wrote:
>> Denis Kirjanov <kda@linux-powerpc.org> writes:
>> > On 11/7/16, Michael Ellerman <mpe@ellerman.id.au> wrote:
>> >> Denis Kirjanov <kda@linux-powerpc.org> writes:
>> >>> [ 67.700897] BUG: using smp_processor_id() in preemptible [00000000] code: cat/7343
>> >>> [ 67.700988] caller is .powernv_cpufreq_throttle_check+0x2c/0x710
>> >>
>> >> When did this break?
>> >
>> > I think that problem exists since commit
>> > 09a972d1620934142d30cfda455ffe429af751c4 ("cpufreq: powernv: Report
>> > cpu frequency throttling") but I can be wrong
>>
>> Yep that looks right to me, thanks.
>>
>> Gautham, how bad is the bug here, do we want to send this to stable?
>
> Not so bad that it needs to be sent to stable immediately.
>
> On CONFIG_PREEMPT enabled systems, if task executing
> powernv_cpufreq_throttle_check can be switched to a CPU on a different
> chip, then we will end up incorrectly attributing the throttle
> statistics of the new chip to the chip where it previously ran. These
> throttle statistics aren't used inside the kernel for any computation,
> but are reported to the user via /sysfs for them to account for any
> variance during a benchmark run.
OK.
> It would be good to include this in the 4.9 fixes though.
Normally I'd say by about rc5 that if it's not important enough for
stable then it can wait for next (or it fixes a bug introduced in the
current release).
But I just realised it's actually in drivers/cpufreq/powernv-cpufreq.c,
which goes via Raphael, so it's up to him.
And he's not on CC :/
Denis can you resend and CC the cpufreq folks:
rjw@rjwysocki.net
viresh.kumar@linaro.org
linux-pm@vger.kernel.org
And add:
Fixes: 09a972d16209 ("cpufreq: powernv: Report cpu frequency throttling")
And fixup the subject to be:
cpufreq, powernv: Disable preemption while checking CPU throttling state
Thanks.
cheers
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2016-11-08 8:27 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-11-04 11:08 [PATCH v2] ppc: cpufreq: disable preemption while checking CPU throttling state Denis Kirjanov
2016-11-07 2:31 ` Gautham R Shenoy
2016-11-07 5:15 ` Denis Kirjanov
2016-11-07 7:36 ` Michael Ellerman
2016-11-07 8:02 ` Denis Kirjanov
2016-11-08 0:21 ` Michael Ellerman
2016-11-08 3:17 ` Gautham R Shenoy
2016-11-08 8:27 ` Michael Ellerman
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