linux-kernel - Re: ./include/linux/mmzone.h:1735:2: error: #error Allocator MAX_ORDER exceeds SECTION

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Message-ID: <D0217FEF-6E59-4458-BC34-A5FDB3097176@nvidia.com>
Date:   Wed, 24 May 2023 07:48:21 -0400
From:   Zi Yan <ziy@...dia.com>
To:     Bagas Sanjaya <bagasdotme@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PowerPC <linuxppc-dev@...ts.ozlabs.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        doru iorgulescu <doru.iorgulescu1@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Fabiano Rosas <farosas@...ux.ibm.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Disha Goel <disgoel@...ux.vnet.ibm.com>
Subject: Re: ./include/linux/mmzone.h:1735:2: error: #error Allocator
 MAX_ORDER exceeds SECTION_SIZE (v6.4-rc3 build regression)

On 24 May 2023, at 6:58, Bagas Sanjaya wrote:

> Hi,
>
> I notice a powerpc[64?] build regression on Bugzilla [1]. Quoting from it:
>
>>  CC      arch/powerpc/kernel/asm-offsets.s
>> In file included from ./include/linux/gfp.h:7,
>>                 from ./include/linux/xarray.h:15,
>>                 from ./include/linux/list_lru.h:14,
>>                 from ./include/linux/fs.h:13,
>>                 from ./include/linux/compat.h:17,
>>                 from arch/powerpc/kernel/asm-offsets.c:12:
>> ./include/linux/mmzone.h:1735:2: error: #error Allocator MAX_ORDER exceeds SECTION_SIZE
>> 1735 | #error Allocator MAX_ORDER exceeds SECTION_SIZE
>>      |  ^~~~~
>> make[5]: *** [scripts/Makefile.build:114: arch/powerpc/kernel/asm-offsets.s] Error 1

By checking the config file from the bugzilla, ARCH_FORCE_MAX_ORDER is set to 9,
(SECTION_SIZE is 24 and 64KB page is used, so 9+16=25>24) but it should be 8
after recent MAX_ORDER changes. I guess the user was using an old config file.

Changing ARCH_FORCE_MAX_ORDER to 8 in the config should fix the issue.

>
> Apparently removing the errored line solves the problem for the reporter
> (the attached dmesg on [2] looks fine at a glance).
>
> Anyway, I'm adding it to regzbot:
>
> #regzbot introduced: 23baf831a32c04f https://bugzilla.kernel.org/show_bug.cgi?id=217477
> #regzbot title: Allocator MAX_ORDER exceeds SECTION_SIZE caused by MAX_ORDER redefinition
>
> Thanks.
>
> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=217477
> [2]: https://bugzilla.kernel.org/show_bug.cgi?id=217477#c1
>
> -- 
> An old man doll... just what I always wanted! - Clara

--
Best Regards,
Yan, Zi

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