linux-kernel - Re: [PATCH] resource, kunit: add dependency on SPARSEMEM

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Message-ID: <87ikty7zpp.fsf@yhuang6-desk2.ccr.corp.intel.com>
Date: Sat, 12 Oct 2024 11:43:46 +0800
From: "Huang, Ying" <ying.huang@...el.com>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>,  Andrew Morton
 <akpm@...ux-foundation.org>,  linux-kernel@...r.kernel.org,  Linus
 Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] resource, kunit: add dependency on SPARSEMEM

Guenter Roeck <linux@...ck-us.net> writes:

> On 10/9/24 23:40, Huang, Ying wrote:
>> Hi, Guenter,
>> Guenter Roeck <linux@...ck-us.net> writes:
>> 
>>> On 9/23/24 18:21, Huang, Ying wrote:
>>>> Guenter Roeck <linux@...ck-us.net> writes:
>>>>
>>>>> On 9/23/24 05:58, Geert Uytterhoeven wrote:
>>>>>> Hi Günter,
>>>>>> On Mon, Sep 23, 2024 at 12:50 AM Guenter Roeck <linux@...ck-us.net>
>>>>>> wrote:
>>>>>>> Building allmodconfig images on systems with SPARSEMEM=n results in
>>>>>>> the following message.
>>>>>>>
>>>>>>> WARNING: unmet direct dependencies detected for GET_FREE_REGION
>>>>>>>      Depends on [n]: SPARSEMEM [=n]
>>>>>>>      Selected by [m]:
>>>>>>>      - RESOURCE_KUNIT_TEST [=m] && RUNTIME_TESTING_MENU [=y] && KUNIT [=m]
>>>>>>>
>>>>>>> and the build ultimately fails.
>>>>>> Really? What's the build error?
>>>>>
>>>>> I saw it on hexagon, and I didn't bother writing down the actual build error
>>>>> message. But it turns out you are correct, the m68k machine does build with
>>>>> CONFIG_RESOURCE_KUNIT_TEST=y even though SPARSEMEM and with it GET_FREE_REGION
>>>>> are not set. Never mind, I don't really want or have time to argue. I'll just
>>>>> disable CONFIG_RESOURCE_KUNIT_TEST when building hexagon images and wherever
>>>>> else I see the problem.
>>>>>
>>>>>> It does build for me on m68k, after fixing:
>>>>>>        --- a/include/linux/mm.h
>>>>>>        +++ b/include/linux/mm.h
>>>>>>        @@ -101,7 +101,7 @@ extern int mmap_rnd_compat_bits __read_mostly;
>>>>>>         # ifdef MAX_PHYSMEM_BITS
>>>>>>         # define PHYSMEM_END   ((1ULL << MAX_PHYSMEM_BITS) - 1)
>>>>>>         # else
>>>>>>        -# define PHYSMEM_END   (-1ULL)
>>>>>>       +# define PHYSMEM_END   ((phys_addr_t)-1)
>>>>>>         # endif
>>>>>>         #endif
>>>> After Linus' fix for PHYSMEM_END, GET_FREE_REGION doesn't need to
>>>> depend
>>>> on SPARSEMEM anymore.  So, I think we can remove the dependency.  Can
>>>> you check whether the following patch work for you on top of latest
>>>> upstream kernel (with Linus' fix).
>>>>
>>>
>>> It works for m68k. I'll run a complete test on all architectures/platforms
>>> tonight.
>> Does it work in the complete test?
>> 
>
> Sorry, I dropped that one. Yes, it does.
>

Thanks a lot!  Can I add your Tested-by in the formal version?

--
Best Regards,
Huang, Ying