From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Heiko Stuebner <heiko@sntech.de>,
Andrew Morton <akpm@linux-foundation.org>,
Matthew Wilcox <willy@infradead.org>,
Zhang Rui <rui.zhang@intel.com>,
Eduardo Valentin <edubezval@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Vinod Koul <vinod.koul@intel.com>
Subject: Re: thermal zones break with patch "Reimplement IDR and IDA using the radix tree" (mainline+next)
Date: Sun, 18 Dec 2016 21:43:19 +0200 [thread overview]
Message-ID: <CAHp75VdbUYUSSstRX1qCHTsFFG75p_A8JU-X76QPYctnQceG9Q@mail.gmail.com> (raw)
In-Reply-To: <BY2PR21MB00362FC819BA305D09EAF6FACB9C0@BY2PR21MB0036.namprd21.prod.outlook.com>
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
next prev parent reply other threads:[~2016-12-18 19:43 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
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 [this message]
2016-12-19 16:37 ` Matthew Wilcox
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