linux-kernel - [PATCH v1 7/8] arm64: hugetlb: Convert set_huge_pte

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Message-Id: <20230921162007.1630149-8-ryan.roberts@arm.com>
Date:   Thu, 21 Sep 2023 17:20:06 +0100
From:   Ryan Roberts <ryan.roberts@....com>
To:     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>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        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>,
        Peter Xu <peterx@...hat.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Qi Zheng <zhengqi.arch@...edance.com>
Cc:     Ryan Roberts <ryan.roberts@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-mm@...ck.org,
        stable@...r.kernel.org
Subject: [PATCH v1 7/8] arm64: hugetlb: Convert set_huge_pte_at() to take vma

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 arm64 modifications. Separate commits
update the other arches and core code, before the actual bug is fixed in
arm64.

No behavioral changes intended.

Signed-off-by: Ryan Roberts <ryan.roberts@....com>
---
 arch/arm64/include/asm/hugetlb.h | 2 +-
 arch/arm64/mm/hugetlbpage.c      | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
index f43a38ac1779..efc9025b9d27 100644
--- a/arch/arm64/include/asm/hugetlb.h
+++ b/arch/arm64/include/asm/hugetlb.h
@@ -27,7 +27,7 @@ static inline void arch_clear_hugepage_flags(struct page *page)
 pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags);
 #define arch_make_huge_pte arch_make_huge_pte
 #define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
-extern void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+extern void set_huge_pte_at(struct vm_area_struct *vma, unsigned long addr,
 			    pte_t *ptep, pte_t pte);
 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
 extern int huge_ptep_set_access_flags(struct vm_area_struct *vma,
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 9c52718ea750..844832511c1e 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -248,9 +248,10 @@ static inline struct folio *hugetlb_swap_entry_to_folio(swp_entry_t entry)
 	return page_folio(pfn_to_page(swp_offset_pfn(entry)));
 }
 
-void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+void set_huge_pte_at(struct vm_area_struct *vma, unsigned long addr,
 			    pte_t *ptep, pte_t pte)
 {
+	struct mm_struct *mm = vma->vm_mm;
 	size_t pgsize;
 	int i;
 	int ncontig;
@@ -571,5 +572,5 @@ pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr
 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);
 }
-- 
2.25.1