linux-kernel - Re: 答复: 答复: [PATCH] ION: Sys_heap: fix the incorrect pool->gfp

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Date:   Thu, 11 Jan 2018 10:29:52 -0800
From:   Laura Abbott <labbott@...hat.com>
To:     "Zengtao (B)" <prime.zeng@...ilicon.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "Chenfeng (puck)" <puck.chen@...ilicon.com>
Cc:     "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "arve@...roid.com" <arve@...roid.com>,
        "tkjos@...roid.com" <tkjos@...roid.com>,
        "maco@...roid.com" <maco@...roid.com>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 答复: 答复: [PATCH] ION: Sys_heap: fix the incorrect pool->gfp_mask setting

On 01/10/2018 06:06 PM, Zengtao (B) wrote:
>> -----邮件原件-----
>> 发件人: Laura Abbott [mailto:labbott@...hat.com]
>> 发送时间: 2018年1月11日 8:01
>> 收件人: Zengtao (B) <prime.zeng@...ilicon.com>; Dan Carpenter
>> <dan.carpenter@...cle.com>; Chenfeng (puck) <puck.chen@...ilicon.com>
>> 抄送: sumit.semwal@...aro.org; gregkh@...uxfoundation.org;
>> arve@...roid.com; tkjos@...roid.com; maco@...roid.com;
>> devel@...verdev.osuosl.org; linux-kernel@...r.kernel.org
>> 主题: Re: 答复: [PATCH] ION: Sys_heap: fix the incorrect pool->gfp_mask
>> setting
>>
>> On 01/09/2018 04:06 AM, Zengtao (B) wrote:
>>>> -----邮件原件-----
>>>> 发件人: Dan Carpenter [mailto:dan.carpenter@...cle.com]
>>>> 发送时间: 2018年1月9日 17:14
>>>> 收件人: Chenfeng (puck) <puck.chen@...ilicon.com>
>>>> 抄送: Zengtao (B) <prime.zeng@...ilicon.com>; labbott@...hat.com;
>>>> sumit.semwal@...aro.org; gregkh@...uxfoundation.org;
>>>> arve@...roid.com; tkjos@...roid.com; maco@...roid.com;
>>>> devel@...verdev.osuosl.org; linux-kernel@...r.kernel.org
>>>> 主题: Re: [PATCH] ION: Sys_heap: fix the incorrect pool->gfp_mask
>>>> setting
>>>>
>>>> On Tue, Jan 09, 2018 at 11:30:09AM +0800, Chen Feng wrote:
>>>>>
>>>>>
>>>>> On 2018/1/9 18:43, Zeng Tao wrote:
>>>>>> This issue is introduced by the commit <e7f63771b60e> ("ION: Sys_heap:
>>>>>> Add cached pool to spead up cached buffer alloc"),
>>>>
>>>> Use the Fixes tag.
>>>>
>>>> Fixes: e7f63771b60e ("ION: Sys_heap: Add cached pool to spead up
>>>> cached buffer alloc")
>>>>
>>> Agree, thanks.
>>>
>>
>> If you're going to be fixing this, it would be good to fix the other problems
>> pointed out (stop with the #define of the flags).
>>
> It is OK, I will fix in the new version fix.
> 
> And to make the code more explicit, I have to choices of fixes:
> Choice 1:
> if (orders[i] > 4)
> 	gfp_flags = high_order_gfp_flags;
> else
> 	gfp_flags = low_order_gfp_flags;
> Choice 2:
> gfp_flags = (orders[i] > 4) ? high_order_gfp_flags : low_order_gfp_flags;
> 

I prefer #1, but please make sure you are following the
suggestions in https://marc.info/?l=linux-kernel&m=151518104214191&w=2

> Any suggestion ?
> 
> 
> BTW, I found another problem related:
> Currently the order 4 and order 0 allocation flag haven't got the __GFP_NOWARN set,
> if the order 4 allocation failed but the allocation of order 0 success, it will print warning
> message which is useless.
> 
> Of course, this is not related to this fix, but this is what I have met when test this fix.
> 

Yes, go ahead and fix that in a separate patch too.

> Thanks
> Zengtao
> 

Thanks,
Laura