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t=1767880723; bh=H8dQU+31z+RB92+oK/SDGHzzr2/P4FoToDpSxpydonI=; h=Subject:To:Cc:From:Date:In-Reply-To:From; b=IkeSLAkWY5Vz6a+nBcXCeus1/QyZLdCjBhjmGOv6JpOsDYEk4I6AifcHrIzHZGPBa uK/n/Siz/eUXgHWq5TTGnQkf7mQy7p/ksSst2xU8DmRs0HVYWcJEFP7mJXZ/tZc9Oa GzhHBH2e3w6vo+NIjIqEXyspbNAoQhSntWoXJ0Ak= Subject: Patch "mm/mprotect: use long for page accountings and retval" has been added to the 5.15-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 14:56:34 +0100 In-Reply-To: <20260106115036.86042-2-harry.yoo@oracle.com> Message-ID: <2026010834-cane-attire-310c@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: 6719F40002 X-Rspam-User: X-Stat-Signature: 9w7r9g7doh8fwyiauam5dzxgtgnm64f1 X-Rspamd-Server: rspam07 X-HE-Tag: 1767880724-945589 X-HE-Meta: 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 iy8adW8T 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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 5.15-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-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >From stable+bounces-205079-greg=kroah.com@vger.kernel.org Tue Jan 6 12:59:45 2026 From: Harry Yoo Date: Tue, 6 Jan 2026 20:50:35 +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: <20260106115036.86042-2-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 @@ -208,7 +208,7 @@ 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); @@ -379,7 +379,7 @@ 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 @@ -1910,7 +1910,7 @@ 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 @@ -5644,7 +5644,7 @@ 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) { struct mm_struct *mm = vma->vm_mm; @@ -5652,7 +5652,7 @@ 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 @@ -634,7 +634,7 @@ 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; @@ -219,13 +219,13 @@ 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; @@ -233,7 +233,7 @@ 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); @@ -291,13 +291,13 @@ next: return pages; } -static inline unsigned long change_pud_range(struct vm_area_struct *vma, +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 { @@ -311,13 +311,13 @@ static inline unsigned long change_pud_r return pages; } -static inline unsigned long change_p4d_range(struct vm_area_struct *vma, +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 { @@ -331,7 +331,7 @@ 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) { @@ -339,7 +339,7 @@ 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); @@ -361,11 +361,11 @@ 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-5.15/mm-mprotect-delete-pmd_none_or_clear_bad_unless_trans_huge.patch queue-5.15/mm-balloon_compaction-we-cannot-have-isolated-pages-in-the-balloon-list.patch queue-5.15/mm-mprotect-use-long-for-page-accountings-and-retval.patch queue-5.15/mm-balloon_compaction-convert-balloon_page_delete-to-balloon_page_finalize.patch