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Wed, 25 Jan 2023 00:38:58 -0800 (PST) Date: Wed, 25 Jan 2023 00:38:46 -0800 In-Reply-To: <20230125083851.27759-1-surenb@google.com> Mime-Version: 1.0 References: <20230125083851.27759-1-surenb@google.com> X-Mailer: git-send-email 2.39.1.405.gd4c25cc71f-goog Message-ID: <20230125083851.27759-2-surenb@google.com> Subject: [PATCH v2 1/6] mm: introduce vma->vm_flags modifier functions From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, paulmck@kernel.org, luto@kernel.org, songliubraving@fb.com, peterx@redhat.com, david@redhat.com, dhowells@redhat.com, hughd@google.com, bigeasy@linutronix.de, kent.overstreet@linux.dev, punit.agrawal@bytedance.com, lstoakes@gmail.com, peterjung1337@gmail.com, rientjes@google.com, axelrasmussen@google.com, 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owner-majordomo@kvack.org List-ID: vm_flags are among VMA attributes which affect decisions like VMA merging and splitting. Therefore all vm_flags modifications are performed after taking exclusive mmap_lock to prevent vm_flags updates racing with such operations. Introduce modifier functions for vm_flags to be used whenever flags are updated. This way we can better check and control correct locking behavior during these updates. Signed-off-by: Suren Baghdasaryan Acked-by: Michal Hocko Acked-by: Mike Rapoport (IBM) --- include/linux/mm.h | 37 +++++++++++++++++++++++++++++++++++++ include/linux/mm_types.h | 8 +++++++- 2 files changed, 44 insertions(+), 1 deletion(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index c2f62bdce134..b71f2809caac 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -627,6 +627,43 @@ static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm) INIT_LIST_HEAD(&vma->anon_vma_chain); } +/* Use when VMA is not part of the VMA tree and needs no locking */ +static inline void init_vm_flags(struct vm_area_struct *vma, + unsigned long flags) +{ + vma->vm_flags = flags; +} + +/* Use when VMA is part of the VMA tree and modifications need coordination */ +static inline void reset_vm_flags(struct vm_area_struct *vma, + unsigned long flags) +{ + mmap_assert_write_locked(vma->vm_mm); + init_vm_flags(vma, flags); +} + +static inline void set_vm_flags(struct vm_area_struct *vma, + unsigned long flags) +{ + mmap_assert_write_locked(vma->vm_mm); + vma->vm_flags |= flags; +} + +static inline void clear_vm_flags(struct vm_area_struct *vma, + unsigned long flags) +{ + mmap_assert_write_locked(vma->vm_mm); + vma->vm_flags &= ~flags; +} + +static inline void mod_vm_flags(struct vm_area_struct *vma, + unsigned long set, unsigned long clear) +{ + mmap_assert_write_locked(vma->vm_mm); + vma->vm_flags |= set; + vma->vm_flags &= ~clear; +} + static inline void vma_set_anonymous(struct vm_area_struct *vma) { vma->vm_ops = NULL; diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 2d6d790d9bed..6c7c70bf50dd 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -491,7 +491,13 @@ struct vm_area_struct { * See vmf_insert_mixed_prot() for discussion. */ pgprot_t vm_page_prot; - unsigned long vm_flags; /* Flags, see mm.h. */ + + /* + * Flags, see mm.h. + * WARNING! Do not modify directly. + * Use {init|reset|set|clear|mod}_vm_flags() functions instead. + */ + unsigned long vm_flags; /* * For areas with an address space and backing store,