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V" , Mike Kravetz Subject: [PATCH v3 04/12] mm: Introduce vma_pgtable_walk_{begin|end}() Date: Thu, 21 Mar 2024 18:07:54 -0400 Message-ID: <20240321220802.679544-5-peterx@redhat.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240321220802.679544-1-peterx@redhat.com> References: <20240321220802.679544-1-peterx@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Queue-Id: 65AEF18000E X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: 3esfy639y3whyj56e6uiquyqjmmnzn5c X-HE-Tag: 1711058896-847528 X-HE-Meta: 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 hQCtX7Lx Az5w+9TFJjLMXT8Qy2mLbhE48sfsCXoSvHUxssmnPmUhssZJYWq2ybnpxFhxxFxA2TvpQYc4Tnhn1COl/9/RULesQ643TkIoLtJfC80DxtsrbbSkb/wh/lo0jXthYQPeZgn/xh4IA4WG2v9XfWRZ9ablbNXX9v1vvmjOugre9nIeb2fOsG3rtSVymVWb7HdM++S/Pu+c7vMYq0+a5hG+TxIYEIsHyEUD5ubjiudGilJ3cqFCRgifBnNQRknFHGs4rVGHF7zsKO7FqNtzK4jcrOjnPSb0YEH9WiH2vYV0PCDoJUDYV7Y4hRaF6eqCvNtYeFSVpweW5Thox95zzfVH+FsKmFRJQBIRfX6zmea87OFjf4JF/Fpkbpst4427xxuoTY53YXK5Cbg5ObQYuOHgh0uIGObweuTO9lCqRe2AliUArNWm59c4ak4DM7TdhO0a/hXQNALcgeCo0Y27YPViIef4Vf1iKhEkG5SxyYqUQLQTp3hs= 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: From: Peter Xu Introduce per-vma begin()/end() helpers for pgtable walks. This is a preparation work to merge hugetlb pgtable walkers with generic mm. The helpers need to be called before and after a pgtable walk, will start to be needed if the pgtable walker code supports hugetlb pages. It's a hook point for any type of VMA, but for now only hugetlb uses it to stablize the pgtable pages from getting away (due to possible pmd unsharing). Reviewed-by: Christoph Hellwig Reviewed-by: Muchun Song Signed-off-by: Peter Xu --- include/linux/mm.h | 3 +++ mm/memory.c | 12 ++++++++++++ 2 files changed, 15 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 8147b1302413..d10eb89f4096 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4198,4 +4198,7 @@ static inline bool pfn_is_unaccepted_memory(unsigned long pfn) return range_contains_unaccepted_memory(paddr, paddr + PAGE_SIZE); } +void vma_pgtable_walk_begin(struct vm_area_struct *vma); +void vma_pgtable_walk_end(struct vm_area_struct *vma); + #endif /* _LINUX_MM_H */ diff --git a/mm/memory.c b/mm/memory.c index 9bce1fa76dd7..4f2caf1c3c4d 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -6438,3 +6438,15 @@ void ptlock_free(struct ptdesc *ptdesc) kmem_cache_free(page_ptl_cachep, ptdesc->ptl); } #endif + +void vma_pgtable_walk_begin(struct vm_area_struct *vma) +{ + if (is_vm_hugetlb_page(vma)) + hugetlb_vma_lock_read(vma); +} + +void vma_pgtable_walk_end(struct vm_area_struct *vma) +{ + if (is_vm_hugetlb_page(vma)) + hugetlb_vma_unlock_read(vma); +} -- 2.44.0