* thermal zones break with patch "Reimplement IDR and IDA using the radix tree" (mainline+next)
@ 2016-12-16 21:12 Heiko Stuebner
2016-12-16 21:19 ` Matthew Wilcox
0 siblings, 1 reply; 6+ messages in thread
From: Heiko Stuebner @ 2016-12-16 21:12 UTC (permalink / raw)
To: Andrew Morton, Matthew Wilcox, Matthew Wilcox, Zhang Rui,
Eduardo Valentin
Cc: linux-kernel
Hi,
commit b05bbe3ea2db ("Reimplement IDR and IDA using the radix tree") seems to
break thermal zone allocation. This happens both on todays mainline and
linux-next-20161216 and produces errors like:
[ 9.397201] WARNING: CPU: 1 PID: 165 at ../fs/sysfs/dir.c:31 sysfs_warn_dup+0x64/0x74
[ 9.405145] sysfs: cannot create duplicate filename '/devices/virtual/thermal/thermal_zone1'
[ 9.514951] Hardware name: Rockchip (Device Tree)
[ 9.522611] [<c03104a4>] (unwind_backtrace) from [<c030ba50>] (show_stack+0x10/0x14)
[ 9.532925] [<c030ba50>] (show_stack) from [<c05a11fc>] (dump_stack+0x88/0x9c)
[ 9.542695] [<c05a11fc>] (dump_stack) from [<c0340c68>] (__warn+0xe8/0x100)
[ 9.552166] [<c0340c68>] (__warn) from [<c0340cb8>] (warn_slowpath_fmt+0x38/0x48)
[ 9.562154] [<c0340cb8>] (warn_slowpath_fmt) from [<c047e944>] (sysfs_warn_dup+0x64/0x74)
[ 9.572834] [<c047e944>] (sysfs_warn_dup) from [<c047ea20>] (sysfs_create_dir_ns+0x84/0x94)
[ 9.583687] [<c047ea20>] (sysfs_create_dir_ns) from [<c05a2cb8>] (kobject_add_internal+0xac/0x2fc)
[ 9.595149] [<c05a2cb8>] (kobject_add_internal) from [<c05a2f50>] (kobject_add+0x48/0x98)
[ 9.605829] [<c05a2f50>] (kobject_add) from [<c07ee340>] (device_add+0xd4/0x5b0)
[ 9.615714] [<c07ee340>] (device_add) from [<c0a43a98>] (thermal_zone_device_register+0x174/0x5cc)
[ 9.627173] [<c0a43a98>] (thermal_zone_device_register) from [<c0a3c588>] (__power_supply_register+0x374/0x44c)
[ 9.639772] [<c0a3c588>] (__power_supply_register) from [<c0a3c6bc>] (devm_power_supply_register+0x4c/0x7c)
System is a Rockchip rk3288-veyron and it has 4 thermal zones (3 from
the thermal ip block of the soc and one from the battery).
Reverting the patch mentioned above results in thermal zones being
registered again.
While I haven't looked to deeply into what idr exactly does, some findings:
- thermal_zone0 and thermal_zone1 are allocated correctly
- every further thermal_zone always gets allocated the number "1"
- thermal core calls idr_alloc with 0 for both start and end
- the rewrite-patch seems to change the semantics of idr_alloc
where it orignally said "@end: the maximum id (exclusive, <= 0 for max)"
the "<= 0" part is gone now, but I checked, simply setting INT_MAX
as end in the thermal_core does not help
Heiko
^ permalink raw reply [flat|nested] 6+ messages in thread* RE: thermal zones break with patch "Reimplement IDR and IDA using the radix tree" (mainline+next)
2016-12-16 21:12 thermal zones break with patch "Reimplement IDR and IDA using the radix tree" (mainline+next) Heiko Stuebner
@ 2016-12-16 21:19 ` Matthew Wilcox
2016-12-17 0:48 ` Heiko Stuebner
2016-12-18 19:43 ` Andy Shevchenko
0 siblings, 2 replies; 6+ messages in thread
From: Matthew Wilcox @ 2016-12-16 21:19 UTC (permalink / raw)
To: Heiko Stuebner, Andrew Morton, Matthew Wilcox, Zhang Rui,
Eduardo Valentin
Cc: linux-kernel
From: Heiko Stuebner [mailto:heiko@sntech.de]
> commit b05bbe3ea2db ("Reimplement IDR and IDA using the radix tree")
> seems to
> break thermal zone allocation. This happens both on todays mainline and
> linux-next-20161216 and produces errors like:
> While I haven't looked to deeply into what idr exactly does, some findings:
> - thermal_zone0 and thermal_zone1 are allocated correctly
> - every further thermal_zone always gets allocated the number "1"
> - thermal core calls idr_alloc with 0 for both start and end
> - the rewrite-patch seems to change the semantics of idr_alloc
> where it orignally said "@end: the maximum id (exclusive, <= 0 for max)"
> the "<= 0" part is gone now, but I checked, simply setting INT_MAX
> as end in the thermal_core does not help
Hi Heiko,
Thanks for the report! The problem is because the thermal subsystem calls idr_alloc() passing a NULL pointer for the data. I have fixed this problem in my git tree but haven't sent the patch to Andrew yet. This patch should fix the problem for you:
http://git.infradead.org/users/willy/linux-dax.git/commitdiff/c52eeed7b759c3fefe9b7f1b0a17a438df6950f3
Now ... thermal is actually using an IDR when it could save memory by using an IDA. Are you interested in doing that conversion?
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: thermal zones break with patch "Reimplement IDR and IDA using the radix tree" (mainline+next)
2016-12-16 21:19 ` Matthew Wilcox
@ 2016-12-17 0:48 ` Heiko Stuebner
2016-12-20 3:56 ` Eduardo Valentin
2016-12-18 19:43 ` Andy Shevchenko
1 sibling, 1 reply; 6+ messages in thread
From: Heiko Stuebner @ 2016-12-17 0:48 UTC (permalink / raw)
To: Matthew Wilcox
Cc: Andrew Morton, Matthew Wilcox, Zhang Rui, Eduardo Valentin, linux-kernel
Hi Matthew,
Am Freitag, 16. Dezember 2016, 21:19:37 CET schrieb Matthew Wilcox:
> From: Heiko Stuebner [mailto:heiko@sntech.de]
>
> > commit b05bbe3ea2db ("Reimplement IDR and IDA using the radix tree")
> > seems to
> > break thermal zone allocation. This happens both on todays mainline and
> > linux-next-20161216 and produces errors like:
>
>
>
> > While I haven't looked to deeply into what idr exactly does, some
> > findings:
- thermal_zone0 and thermal_zone1 are allocated correctly
> > - every further thermal_zone always gets allocated the number "1"
> > - thermal core calls idr_alloc with 0 for both start and end
> > - the rewrite-patch seems to change the semantics of idr_alloc
> >
> > where it orignally said "@end: the maximum id (exclusive, <= 0 for
> > max)"
> > the "<= 0" part is gone now, but I checked, simply setting INT_MAX
> > as end in the thermal_core does not help
>
>
> Hi Heiko,
>
> Thanks for the report! The problem is because the thermal subsystem calls
> idr_alloc() passing a NULL pointer for the data. I have fixed this problem
> in my git tree but haven't sent the patch to Andrew yet. This patch should
> fix the problem for you:
> http://git.infradead.org/users/willy/linux-dax.git/commitdiff/c52eeed7b759c3
> fefe9b7f1b0a17a438df6950f3
yay, this fixes the issue. This should definitly go as fix into 4.10-rc and when
you send it to Andrew you can add my
Tested-by: Heiko Stuebner <heiko@sntech.de>
> Now ... thermal is actually using an IDR when it could save memory by using
> an IDA. Are you interested in doing that conversion?
That would more be a question for Eduardo and Rui :-) . I'm just in the
process of tracking down the smallish issues on my Rockchip board that are
poping up during the merge-window.
Anyway, thanks for pointing to the fix
Heiko
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: thermal zones break with patch "Reimplement IDR and IDA using the radix tree" (mainline+next)
2016-12-17 0:48 ` Heiko Stuebner
@ 2016-12-20 3:56 ` Eduardo Valentin
0 siblings, 0 replies; 6+ messages in thread
From: Eduardo Valentin @ 2016-12-20 3:56 UTC (permalink / raw)
To: Heiko Stuebner
Cc: Matthew Wilcox, Andrew Morton, Matthew Wilcox, Zhang Rui, linux-kernel
Hey,
On Sat, Dec 17, 2016 at 01:48:33AM +0100, Heiko Stuebner wrote:
> Hi Matthew,
>
> Am Freitag, 16. Dezember 2016, 21:19:37 CET schrieb Matthew Wilcox:
> > From: Heiko Stuebner [mailto:heiko@sntech.de]
> >
> > > commit b05bbe3ea2db ("Reimplement IDR and IDA using the radix tree")
> > > seems to
> > > break thermal zone allocation. This happens both on todays mainline and
> > > linux-next-20161216 and produces errors like:
> >
> >
> >
> > > While I haven't looked to deeply into what idr exactly does, some
> > > findings:
> - thermal_zone0 and thermal_zone1 are allocated correctly
> > > - every further thermal_zone always gets allocated the number "1"
> > > - thermal core calls idr_alloc with 0 for both start and end
> > > - the rewrite-patch seems to change the semantics of idr_alloc
> > >
> > > where it orignally said "@end: the maximum id (exclusive, <= 0 for
> > > max)"
> > > the "<= 0" part is gone now, but I checked, simply setting INT_MAX
> > > as end in the thermal_core does not help
> >
> >
> > Hi Heiko,
> >
> > Thanks for the report! The problem is because the thermal subsystem calls
> > idr_alloc() passing a NULL pointer for the data. I have fixed this problem
> > in my git tree but haven't sent the patch to Andrew yet. This patch should
> > fix the problem for you:
>
> > http://git.infradead.org/users/willy/linux-dax.git/commitdiff/c52eeed7b759c3
> > fefe9b7f1b0a17a438df6950f3
>
> yay, this fixes the issue. This should definitly go as fix into 4.10-rc and when
> you send it to Andrew you can add my
>
> Tested-by: Heiko Stuebner <heiko@sntech.de>
>
>
> > Now ... thermal is actually using an IDR when it could save memory by using
> > an IDA. Are you interested in doing that conversion?
>
> That would more be a question for Eduardo and Rui :-) . I'm just in the
> process of tracking down the smallish issues on my Rockchip board that are
> poping up during the merge-window.
I would prefer to get the right implementation, and fixing thermal core by using IDA.
But given that this touches thermal core, we need an agreement with Rui
too.
>
>
> Anyway, thanks for pointing to the fix
> Heiko
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: thermal zones break with patch "Reimplement IDR and IDA using the radix tree" (mainline+next)
2016-12-16 21:19 ` Matthew Wilcox
2016-12-17 0:48 ` Heiko Stuebner
@ 2016-12-18 19:43 ` Andy Shevchenko
2016-12-19 16:37 ` Matthew Wilcox
1 sibling, 1 reply; 6+ messages in thread
From: Andy Shevchenko @ 2016-12-18 19:43 UTC (permalink / raw)
To: Matthew Wilcox
Cc: Heiko Stuebner, Andrew Morton, Matthew Wilcox, Zhang Rui,
Eduardo Valentin, linux-kernel, Mika Westerberg, Vinod Koul
On Fri, Dec 16, 2016 at 11:19 PM, Matthew Wilcox <mawilcox@microsoft.com> wrote:
> From: Heiko Stuebner [mailto:heiko@sntech.de]
>> commit b05bbe3ea2db ("Reimplement IDR and IDA using the radix tree")
>> seems to
>> break thermal zone allocation. This happens both on todays mainline and
>> linux-next-20161216 and produces errors like:
>
>> While I haven't looked to deeply into what idr exactly does, some findings:
>> - thermal_zone0 and thermal_zone1 are allocated correctly
>> - every further thermal_zone always gets allocated the number "1"
>> - thermal core calls idr_alloc with 0 for both start and end
>> - the rewrite-patch seems to change the semantics of idr_alloc
>> where it orignally said "@end: the maximum id (exclusive, <= 0 for max)"
>> the "<= 0" part is gone now, but I checked, simply setting INT_MAX
>> as end in the thermal_core does not help
>
> Hi Heiko,
>
> Thanks for the report! The problem is because the thermal subsystem calls idr_alloc() passing a NULL pointer for the data. I have fixed this problem in my git tree but haven't sent the patch to Andrew yet. This patch should fix the problem for you:
>
> http://git.infradead.org/users/willy/linux-dax.git/commitdiff/c52eeed7b759c3fefe9b7f1b0a17a438df6950f3
>
> Now ... thermal is actually using an IDR when it could save memory by using an IDA. Are you interested in doing that conversion?
+Cc: Mika, Vinod
Same here for at least DMA Engine (and perhaps another place in
thermal subsystem).
For DMA Engine case
Tested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 6+ messages in thread* RE: thermal zones break with patch "Reimplement IDR and IDA using the radix tree" (mainline+next)
2016-12-18 19:43 ` Andy Shevchenko
@ 2016-12-19 16:37 ` Matthew Wilcox
0 siblings, 0 replies; 6+ messages in thread
From: Matthew Wilcox @ 2016-12-19 16:37 UTC (permalink / raw)
To: Andy Shevchenko
Cc: Heiko Stuebner, Andrew Morton, Matthew Wilcox, Zhang Rui,
Eduardo Valentin, linux-kernel, Mika Westerberg, Vinod Koul
From: Andy Shevchenko [mailto:andy.shevchenko@gmail.com]
> On Fri, Dec 16, 2016 at 11:19 PM, Matthew Wilcox
> <mawilcox@microsoft.com> wrote:
> > Now ... thermal is actually using an IDR when it could save memory by using
> an IDA. Are you interested in doing that conversion?
>
> +Cc: Mika, Vinod
>
> Same here for at least DMA Engine (and perhaps another place in
> thermal subsystem).
Hey Andy, thanks for testing! Could you test another patch for me as well, to switch DMA Engine over to using an IDA instead of an IDR? This should save 576 bytes on a normal setup.
The patch itself is here:
http://git.infradead.org/users/willy/linux-dax.git/commitdiff/a4f4e8554639b3fba9a62c07ad0e2423ea1f5f31
but it may be better just to test the head of this tree:
http://git.infradead.org/users/willy/linux-dax.git/shortlog/refs/heads/idr-2016-12-16
as I keep fixing bugs :-)
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2016-12-20 3:56 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-12-16 21:12 thermal zones break with patch "Reimplement IDR and IDA using the radix tree" (mainline+next) Heiko Stuebner
2016-12-16 21:19 ` Matthew Wilcox
2016-12-17 0:48 ` Heiko Stuebner
2016-12-20 3:56 ` Eduardo Valentin
2016-12-18 19:43 ` Andy Shevchenko
2016-12-19 16:37 ` Matthew Wilcox
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).