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t=1767879422; bh=t7J0TVUXooyegmOpUhdvRGPufZ6P+rcP3pmOwloUk4c=; h=Subject:To:Cc:From:Date:In-Reply-To:From; b=ZeoA+uRG6Sj4tnKAx+tKpMHYXcn543wheDaFE7uvRByAxfr4riMp148tZxPMaTdvy VPy7yb2KI+cQzvZJB71oHclr1WOwgNCnRvNBgn9qtLR+9M2Xu/jsZtcUomj48RfDKz qpkuer7bUNVwfeEgEWRuDljsY/a+Q0M3gkB+S82U= Subject: Patch "mm/mprotect: use long for page accountings and retval" has been added to the 6.1-stable tree To: Liam.Howlett@oracle.com,aarcange@redhat.com,akpm@linux-foundation.org,axelrasmussen@google.com,baohua@kernel.org,baolin.wang@linux.alibaba.com,david@kernel.org,david@redhat.com,dev.jain@arm.com,gregkh@linuxfoundation.org,harry.yoo@oracle.com,hughd@google.com,jane.chu@oracle.com,jannh@google.com,jthoughton@google.com,kas@kernel.org,lance.yang@linux.dev,linux-mm@kvack.org,lorenzo.stoakes@oracle.com,mike.kravetz@oracle.com,nadav.amit@gmail.com,npache@redhat.com,peterx@redhat.com,pfalcato@suse.de,ryan.roberts@arm.com,songmuchun@bytedance.com,vbabka@suse.cz,ziy@nvidia.com Cc: From: Date: Thu, 08 Jan 2026 14:36:38 +0100 In-Reply-To: <20260106114715.80958-2-harry.yoo@oracle.com> Message-ID: <2026010838-rake-dotted-6c9b@gregkh> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit X-stable: commit X-Patchwork-Hint: ignore X-Rspamd-Queue-Id: 91C68A0009 X-Rspam-User: X-Stat-Signature: 4ygftoqw1czc6p6ytdss7pdryxusrniz X-Rspamd-Server: rspam07 X-HE-Tag: 1767879423-241953 X-HE-Meta: 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 oKozIG3C 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This is a note to let you know that I've just added the patch titled mm/mprotect: use long for page accountings and retval to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mm-mprotect-use-long-for-page-accountings-and-retval.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >From stable+bounces-205075-greg=kroah.com@vger.kernel.org Tue Jan 6 12:48:24 2026 From: Harry Yoo Date: Tue, 6 Jan 2026 20:47:13 +0900 Subject: mm/mprotect: use long for page accountings and retval To: stable@vger.kernel.org Cc: Liam.Howlett@oracle.com, akpm@linux-foundation.org, baohua@kernel.org, baolin.wang@linux.alibaba.com, david@kernel.org, dev.jain@arm.com, hughd@google.com, jane.chu@oracle.com, jannh@google.com, kas@kernel.org, lance.yang@linux.dev, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, npache@redhat.com, pfalcato@suse.de, ryan.roberts@arm.com, vbabka@suse.cz, ziy@nvidia.com, Peter Xu , Mike Kravetz , James Houghton , Andrea Arcangeli , Axel Rasmussen , David Hildenbrand , Muchun Song , Nadav Amit , Harry Yoo Message-ID: <20260106114715.80958-2-harry.yoo@oracle.com> From: Peter Xu commit a79390f5d6a78647fd70856bd42b22d994de0ba2 upstream. Switch to use type "long" for page accountings and retval across the whole procedure of change_protection(). The change should have shrinked the possible maximum page number to be half comparing to previous (ULONG_MAX / 2), but it shouldn't overflow on any system either because the maximum possible pages touched by change protection should be ULONG_MAX / PAGE_SIZE. Two reasons to switch from "unsigned long" to "long": 1. It suites better on count_vm_numa_events(), whose 2nd parameter takes a long type. 2. It paves way for returning negative (error) values in the future. Currently the only caller that consumes this retval is change_prot_numa(), where the unsigned long was converted to an int. Since at it, touching up the numa code to also take a long, so it'll avoid any possible overflow too during the int-size convertion. Link: https://lkml.kernel.org/r/20230104225207.1066932-3-peterx@redhat.com Signed-off-by: Peter Xu Acked-by: Mike Kravetz Acked-by: James Houghton Cc: Andrea Arcangeli Cc: Axel Rasmussen Cc: David Hildenbrand Cc: Muchun Song Cc: Nadav Amit Signed-off-by: Andrew Morton [ Adjust context ] Signed-off-by: Harry Yoo Acked-by: David Hildenbrand (Red Hat) Signed-off-by: Greg Kroah-Hartman --- include/linux/hugetlb.h | 4 ++-- include/linux/mm.h | 2 +- mm/hugetlb.c | 4 ++-- mm/mempolicy.c | 2 +- mm/mprotect.c | 26 +++++++++++++------------- 5 files changed, 19 insertions(+), 19 deletions(-) --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -233,7 +233,7 @@ void hugetlb_vma_lock_release(struct kre int pmd_huge(pmd_t pmd); int pud_huge(pud_t pud); -unsigned long hugetlb_change_protection(struct vm_area_struct *vma, +long hugetlb_change_protection(struct vm_area_struct *vma, unsigned long address, unsigned long end, pgprot_t newprot, unsigned long cp_flags); @@ -447,7 +447,7 @@ static inline void move_hugetlb_state(st { } -static inline unsigned long hugetlb_change_protection( +static inline long hugetlb_change_protection( struct vm_area_struct *vma, unsigned long address, unsigned long end, pgprot_t newprot, unsigned long cp_flags) --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2148,7 +2148,7 @@ extern unsigned long move_page_tables(st #define MM_CP_UFFD_WP_ALL (MM_CP_UFFD_WP | \ MM_CP_UFFD_WP_RESOLVE) -extern unsigned long change_protection(struct mmu_gather *tlb, +extern long change_protection(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long start, unsigned long end, pgprot_t newprot, unsigned long cp_flags); --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -6668,7 +6668,7 @@ long follow_hugetlb_page(struct mm_struc return i ? i : err; } -unsigned long hugetlb_change_protection(struct vm_area_struct *vma, +long hugetlb_change_protection(struct vm_area_struct *vma, unsigned long address, unsigned long end, pgprot_t newprot, unsigned long cp_flags) { @@ -6677,7 +6677,7 @@ unsigned long hugetlb_change_protection( pte_t *ptep; pte_t pte; struct hstate *h = hstate_vma(vma); - unsigned long pages = 0, psize = huge_page_size(h); + long pages = 0, psize = huge_page_size(h); bool shared_pmd = false; struct mmu_notifier_range range; unsigned long last_addr_mask; --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -628,7 +628,7 @@ unsigned long change_prot_numa(struct vm unsigned long addr, unsigned long end) { struct mmu_gather tlb; - int nr_updated; + long nr_updated; tlb_gather_mmu(&tlb, vma->vm_mm); --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -72,13 +72,13 @@ static inline bool can_change_pte_writab return true; } -static unsigned long change_pte_range(struct mmu_gather *tlb, +static long change_pte_range(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, unsigned long end, pgprot_t newprot, unsigned long cp_flags) { pte_t *pte, oldpte; spinlock_t *ptl; - unsigned long pages = 0; + long pages = 0; int target_node = NUMA_NO_NODE; bool prot_numa = cp_flags & MM_CP_PROT_NUMA; bool uffd_wp = cp_flags & MM_CP_UFFD_WP; @@ -346,13 +346,13 @@ uffd_wp_protect_file(struct vm_area_stru } \ } while (0) -static inline unsigned long change_pmd_range(struct mmu_gather *tlb, +static inline long change_pmd_range(struct mmu_gather *tlb, struct vm_area_struct *vma, pud_t *pud, unsigned long addr, unsigned long end, pgprot_t newprot, unsigned long cp_flags) { pmd_t *pmd; unsigned long next; - unsigned long pages = 0; + long pages = 0; unsigned long nr_huge_updates = 0; struct mmu_notifier_range range; @@ -360,7 +360,7 @@ static inline unsigned long change_pmd_r pmd = pmd_offset(pud, addr); do { - unsigned long this_pages; + long this_pages; next = pmd_addr_end(addr, end); @@ -430,13 +430,13 @@ next: return pages; } -static inline unsigned long change_pud_range(struct mmu_gather *tlb, +static inline long change_pud_range(struct mmu_gather *tlb, struct vm_area_struct *vma, p4d_t *p4d, unsigned long addr, unsigned long end, pgprot_t newprot, unsigned long cp_flags) { pud_t *pud; unsigned long next; - unsigned long pages = 0; + long pages = 0; pud = pud_offset(p4d, addr); do { @@ -451,13 +451,13 @@ static inline unsigned long change_pud_r return pages; } -static inline unsigned long change_p4d_range(struct mmu_gather *tlb, +static inline long change_p4d_range(struct mmu_gather *tlb, struct vm_area_struct *vma, pgd_t *pgd, unsigned long addr, unsigned long end, pgprot_t newprot, unsigned long cp_flags) { p4d_t *p4d; unsigned long next; - unsigned long pages = 0; + long pages = 0; p4d = p4d_offset(pgd, addr); do { @@ -472,14 +472,14 @@ static inline unsigned long change_p4d_r return pages; } -static unsigned long change_protection_range(struct mmu_gather *tlb, +static long change_protection_range(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long addr, unsigned long end, pgprot_t newprot, unsigned long cp_flags) { struct mm_struct *mm = vma->vm_mm; pgd_t *pgd; unsigned long next; - unsigned long pages = 0; + long pages = 0; BUG_ON(addr >= end); pgd = pgd_offset(mm, addr); @@ -498,12 +498,12 @@ static unsigned long change_protection_r return pages; } -unsigned long change_protection(struct mmu_gather *tlb, +long change_protection(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long start, unsigned long end, pgprot_t newprot, unsigned long cp_flags) { - unsigned long pages; + long pages; BUG_ON((cp_flags & MM_CP_UFFD_WP_ALL) == MM_CP_UFFD_WP_ALL); Patches currently in stable-queue which might be from harry.yoo@oracle.com are queue-6.1/mm-simplify-folio_expected_ref_count.patch queue-6.1/mm-mprotect-delete-pmd_none_or_clear_bad_unless_trans_huge.patch queue-6.1/mm-balloon_compaction-we-cannot-have-isolated-pages-in-the-balloon-list.patch queue-6.1/mm-mprotect-use-long-for-page-accountings-and-retval.patch queue-6.1/mm-balloon_compaction-convert-balloon_page_delete-to-balloon_page_finalize.patch