Re: [PATCH v1 6/8] mm: hugetlb: Convert set_huge_pte_at() to take vma

From: SeongJae Park <sj@kernel.org>
To: Ryan Roberts <ryan.roberts@arm.com>
Cc: Will Deacon <will@kernel.org>,
	"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
	Helge Deller <deller@gmx.de>, Nicholas Piggin <npiggin@gmail.com>,
	Christophe Leroy <christophe.leroy@csgroup.eu>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	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>,
	Andrew Morton <akpm@linux-foundation.org>,
	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>,
	Qi Zheng <zhengqi.arch@bytedance.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org,
	linux-s390@vger.kernel.org, sparclinux@vger.kernel.org,
	linux-mm@kvack.org, stable@vger.kernel.org
Subject: Re: [PATCH v1 6/8] mm: hugetlb: Convert set_huge_pte_at() to take vma
Date: Fri, 22 Sep 2023 01:37:11 +0000	[thread overview]
Message-ID: <20230922013711.100278-1-sj@kernel.org> (raw)
In-Reply-To: <20230921162007.1630149-7-ryan.roberts@arm.com>

Hi Ryan,

On Thu, 21 Sep 2023 17:20:05 +0100 Ryan Roberts <ryan.roberts@arm.com> wrote:

> 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 modifications to the core mm. Separate
> commits update the arches, before the actual bug is fixed in arm64.
> 
> No behavioral changes intended.
> 
> Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>

For mm/damon/ part change,

Reviewed-by: SeongJae Park <sj@kernel.org>

Thanks,
SJ

> ---
>  include/asm-generic/hugetlb.h |  6 +++---
>  include/linux/hugetlb.h       |  6 +++---
>  mm/damon/vaddr.c              |  2 +-
>  mm/hugetlb.c                  | 30 +++++++++++++++---------------
>  mm/migrate.c                  |  2 +-
>  mm/rmap.c                     | 10 +++++-----
>  mm/vmalloc.c                  |  5 ++++-
>  7 files changed, 32 insertions(+), 29 deletions(-)
> 
> diff --git a/include/asm-generic/hugetlb.h b/include/asm-generic/hugetlb.h
> index 4da02798a00b..515e4777fb65 100644
> --- a/include/asm-generic/hugetlb.h
> +++ b/include/asm-generic/hugetlb.h
> @@ -75,10 +75,10 @@ static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
>  #endif
>  
>  #ifndef __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
> -static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
> -		pte_t *ptep, pte_t pte)
> +static inline void set_huge_pte_at(struct vm_area_struct *vma,
> +		unsigned long addr, pte_t *ptep, pte_t pte)
>  {
> -	set_pte_at(mm, addr, ptep, pte);
> +	set_pte_at(vma->vm_mm, addr, ptep, pte);
>  }
>  #endif
>  
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index 5b2626063f4f..08184f32430c 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -984,7 +984,7 @@ static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
>  						unsigned long addr, pte_t *ptep,
>  						pte_t old_pte, pte_t pte)
>  {
> -	set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
> +	set_huge_pte_at(vma, addr, ptep, pte);
>  }
>  #endif
>  
> @@ -1172,8 +1172,8 @@ static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
>  #endif
>  }
>  
> -static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
> -				   pte_t *ptep, pte_t pte)
> +static inline void set_huge_pte_at(struct vm_area_struct *vma,
> +				   unsigned long addr, pte_t *ptep, pte_t pte)
>  {
>  }
>  
> diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
> index 4c81a9dbd044..55da8cee8fbc 100644
> --- a/mm/damon/vaddr.c
> +++ b/mm/damon/vaddr.c
> @@ -347,7 +347,7 @@ static void damon_hugetlb_mkold(pte_t *pte, struct mm_struct *mm,
>  	if (pte_young(entry)) {
>  		referenced = true;
>  		entry = pte_mkold(entry);
> -		set_huge_pte_at(mm, addr, pte, entry);
> +		set_huge_pte_at(vma, addr, pte, entry);
>  	}
>  
>  #ifdef CONFIG_MMU_NOTIFIER
[...]

Thanks,
SJ