linux-kernel - Re: [PATCH v1 2/8] powerpc: hugetlb: Convert set_huge_pte

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Date:   Fri, 22 Sep 2023 06:44:38 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Ryan Roberts <ryan.roberts@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Nicholas Piggin <npiggin@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        SeongJae Park <sj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
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CC:     "linux-arm-kernel@...ts.infradead.org" 
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        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
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        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v1 2/8] powerpc: hugetlb: Convert set_huge_pte_at() to
 take vma



Le 21/09/2023 à 20:43, Christophe Leroy a écrit :
> 
> 
> Le 21/09/2023 à 18:20, Ryan Roberts a écrit :
>> In order to fix a bug, arm64 needs access to the vma inside it's
>> implementation of set_huge_pte_at(). Provide for this by converting the
>> mm parameter to be a vma. Any implementations that require the mm can
>> access it via vma->vm_mm.
>>
>> This commit makes the required powerpc modifications. Separate commits
>> update the other arches and core code, before the actual bug is fixed in
>> arm64.
>>
>> No behavioral changes intended.
> 
> This patch doesn't build, allthough I have also applied patch 1. Is
> something missing ?
> 
>     CALL    scripts/checksyscalls.sh
>     CC      arch/powerpc/kernel/setup-common.o
> In file included from arch/powerpc/kernel/setup-common.c:37:
> ./include/linux/hugetlb.h: In function 'huge_ptep_modify_prot_commit':
> ./include/linux/hugetlb.h:987:28: error: passing argument 1 of
> 'set_huge_pte_at' from incompatible pointer type
> [-Werror=incompatible-pointer-types]
>     987 |         set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
>         |                         ~~~^~~~~~~
>         |                            |
>         |                            struct mm_struct *
> In file included from ./arch/powerpc/include/asm/hugetlb.h:13,
>                    from ./include/linux/hugetlb.h:815:
> ./arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h:49:45: note: expected
> 'struct vm_area_struct *' but argument is of type 'struct mm_struct *'
>      49 | void set_huge_pte_at(struct vm_area_struct *vma, unsigned long
> addr, pte_t *ptep, pte_t pte);
>         |                      ~~~~~~~~~~~~~~~~~~~~~~~^~~
> cc1: all warnings being treated as errors
> make[4]: *** [scripts/Makefile.build:243:

Oh, I realised that it requires patch 6 to build properly. This is not 
good. Your series should be bisectable, that means it must build and run 
successfully after each patch. Therefore you have to squash patches 1 to 
7 all togethers.

I'll send you comments on the powerpc part in another mail.

Christophe