linux-kernel - Re: Linux 6.18 amdgpu build error

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Message-ID: <b24fc85c-0e6d-42f9-a6b9-05136409098f@linuxfoundation.org>
Date: Thu, 4 Dec 2025 10:40:29 -0700
From: Shuah Khan <skhan@...uxfoundation.org>
To: "David Hildenbrand (Red Hat)" <david@...nel.org>,
 Linus Torvalds <torvalds@...ux-foundation.org>, akpm@...ux-foundation.org
Cc: Alexander Deucher <Alexander.Deucher@....com>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 amd-gfx@...ts.freedesktop.org, dri-devel <dri-devel@...ts.freedesktop.org>,
 Guenter Roeck <linux@...ck-us.net>,
 Linux Memory Management List <linux-mm@...ck.org>,
 Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: Linux 6.18 amdgpu build error

On 12/3/25 23:05, David Hildenbrand (Red Hat) wrote:
> On 12/4/25 03:34, Shuah Khan wrote:
>> On 12/3/25 18:06, Guenter Roeck wrote:
>>> On 12/3/25 14:16, Shuah Khan wrote:
>>
>>>>
>>>> CONFIG_RANDSTRUCT is disabled and so are the GCC_PLUGINS in my config.
>>>
>>> I guess that would have been too easy...
>>>
>>>> I am also seeing issues with cloning kernel.org repos on my system after
>>>> a recent update:
>>>>
>>>> remote: Enumerating objects: 11177736, done.
>>>> remote: Counting objects: 100% (1231/1231), done.
>>>> remote: Compressing objects: 100% (624/624), done.
>>>> remote: Total 11177736 (delta 855), reused 781 (delta 606), pack-reused 11176505 (from 1)
>>>> Receiving objects: 100% (11177736/11177736), 3.01 GiB | 7.10 MiB/s, done.
>>>> Resolving deltas: 100% (9198323/9198323), done.
>>>> fatal: did not receive expected object 0002003e951b5057c16de5a39140abcbf6e44e50
>>>> fatal: fetch-pack: invalid index-pack output
>>>>
>>>
>>
>> Linus, Andrew, and David,
>>
>> Finally figured this out. I narrowed it to  to be the HAVE_GIGANTIC_FOLIOS
>> support that went into Linux 6.18-rc6 in this commit:
>>
>>   From 39231e8d6ba7f794b566fd91ebd88c0834a23b98 Mon Sep 17 00:00:00 2001
>> From: "David Hildenbrand (Red Hat)" <david@...nel.org>
>> Date: Fri, 14 Nov 2025 22:49:20 +0100
>> Subject: [PATCH] mm: fix MAX_FOLIO_ORDER on powerpc configs with hugetlb
>>
> 
> Unsuspected and confusing :(

This commit has impact on all architectures, not a narrow scoped
powerpc only thing -  it enables HAVE_GIGANTIC_FOLIOS on x86_64
and changes the common code that determines MAX_FOLIO_ORDER in
include/linux/mm.h

> 
> Let me take a look at reply on the revert.
> 

Sounds good. Reverting or finding a fix is good with me. It definitely
impacted two of my systems and the problem was introduced in
Linux 6.18-rc6 and is in Linux 6.18.

thanks,
-- Shuah