Re: [PATCH v1 2/8] powerpc: hugetlb: Convert set_huge_pte_at() to take vma

From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Ryan Roberts <ryan.roberts@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
	Helge Deller <deller@gmx.de>, Nicholas Piggin <npiggin@gmail.com>,
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	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Christian Borntraeger <borntraeger@linux.ibm.com>,
	Sven Schnelle <svens@linux.ibm.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	"David S. Miller" <davem@davemloft.net>,
	Arnd Bergmann <arnd@arndb.de>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Muchun Song <muchun.song@linux.dev>,
	SeongJae Park <sj@kernel.org>,
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	Uladzislau Rezki <urezki@gmail.com>,
	Christoph Hellwig <hch@infradead.org>,
	Lorenzo Stoakes <lstoakes@gmail.com>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Peter Xu <peterx@redhat.com>,
	Axel Rasmussen <axelrasmussen@google.com>,
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Subject: Re: [PATCH v1 2/8] powerpc: hugetlb: Convert set_huge_pte_at() to take vma
Date: Fri, 22 Sep 2023 06:44:38 +0000	[thread overview]
Message-ID: <0958d813-15f8-5ed5-1e20-08b8feb465ad@csgroup.eu> (raw)
In-Reply-To: <9864a7eb-004d-14c6-c2bd-bb9333fe67be@csgroup.eu>

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
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