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a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767889725; bh=FgVg1OM8KvvgA1jnKuP5d+B3bE/cWOn7s0ICq2uXKoc=; h=Subject:To:Cc:From:Date:In-Reply-To:From; b=yKXKVZpvbDLwXdfXOZHk+mKVmbdyNBJHjiKsO93C6duhNQfZmTBsBA8oZJUrpqCfC rIloZbXlbhAbSQ/ZIXAyVlE98YAKqPVYqOq9IgCZW/rc6vx4tYrQOOuHloJ3d1b1vQ gJhWTmN93PgVWDAghZ64czgPAeP69ehpvwBFtWLE= Subject: Patch "mm/mprotect: use long for page accountings and retval" has been added to the 5.10-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 17:27:39 +0100 In-Reply-To: <20260107032121.587629-2-harry.yoo@oracle.com> Message-ID: <2026010839-ranch-jarring-c578@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-Rspam-User: X-Stat-Signature: u1x68u9wxnr5xtwwwre5mktcb3sc6sde X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 810544000A X-HE-Tag: 1767889726-464336 X-HE-Meta: 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 jRZCppH3 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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 5.10-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-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >From stable+bounces-206084-greg=kroah.com@vger.kernel.org Wed Jan 7 04:22:20 2026 From: Harry Yoo Date: Wed, 7 Jan 2026 12:21:20 +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: <20260107032121.587629-2-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 | 34 +++++++++++++++++----------------- 5 files changed, 23 insertions(+), 23 deletions(-) --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -184,7 +184,7 @@ struct page *follow_huge_pgd(struct mm_s 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); bool is_hugetlb_entry_migration(pte_t pte); @@ -342,7 +342,7 @@ 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) { --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1876,7 +1876,7 @@ 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 vm_area_struct *vma, unsigned long start, +extern long change_protection(struct vm_area_struct *vma, unsigned long start, unsigned long end, pgprot_t newprot, unsigned long cp_flags); extern int mprotect_fixup(struct vm_area_struct *vma, --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -5051,7 +5051,7 @@ same_page: #define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end) #endif -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) { struct mm_struct *mm = vma->vm_mm; @@ -5059,7 +5059,7 @@ unsigned long hugetlb_change_protection( pte_t *ptep; pte_t pte; struct hstate *h = hstate_vma(vma); - unsigned long pages = 0; + long pages = 0; bool shared_pmd = false; struct mmu_notifier_range range; --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -653,7 +653,7 @@ unlock: unsigned long change_prot_numa(struct vm_area_struct *vma, unsigned long addr, unsigned long end) { - int nr_updated; + long nr_updated; nr_updated = change_protection(vma, addr, end, PAGE_NONE, MM_CP_PROT_NUMA); if (nr_updated) --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -35,13 +35,13 @@ #include "internal.h" -static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd, +static long change_pte_range(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 dirty_accountable = cp_flags & MM_CP_DIRTY_ACCT; bool prot_numa = cp_flags & MM_CP_PROT_NUMA; @@ -209,13 +209,13 @@ static inline int pmd_none_or_clear_bad_ return 0; } -static inline unsigned long change_pmd_range(struct vm_area_struct *vma, +static inline long change_pmd_range(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; @@ -223,7 +223,7 @@ 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); @@ -281,13 +281,13 @@ next: return pages; } -static inline unsigned long change_pud_range(struct vm_area_struct *vma, - p4d_t *p4d, unsigned long addr, unsigned long end, - pgprot_t newprot, unsigned long cp_flags) +static inline long change_pud_range(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 { @@ -301,13 +301,13 @@ static inline unsigned long change_pud_r return pages; } -static inline unsigned long change_p4d_range(struct vm_area_struct *vma, - pgd_t *pgd, unsigned long addr, unsigned long end, - pgprot_t newprot, unsigned long cp_flags) +static inline long change_p4d_range(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 { @@ -321,7 +321,7 @@ static inline unsigned long change_p4d_r return pages; } -static unsigned long change_protection_range(struct vm_area_struct *vma, +static long change_protection_range(struct vm_area_struct *vma, unsigned long addr, unsigned long end, pgprot_t newprot, unsigned long cp_flags) { @@ -329,7 +329,7 @@ static unsigned long change_protection_r pgd_t *pgd; unsigned long next; unsigned long start = addr; - unsigned long pages = 0; + long pages = 0; BUG_ON(addr >= end); pgd = pgd_offset(mm, addr); @@ -351,11 +351,11 @@ static unsigned long change_protection_r return pages; } -unsigned long change_protection(struct vm_area_struct *vma, unsigned long start, +long change_protection(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-5.10/mm-mprotect-delete-pmd_none_or_clear_bad_unless_trans_huge.patch queue-5.10/mm-balloon_compaction-we-cannot-have-isolated-pages-in-the-balloon-list.patch queue-5.10/mm-mprotect-use-long-for-page-accountings-and-retval.patch queue-5.10/mm-balloon_compaction-convert-balloon_page_delete-to-balloon_page_finalize.patch