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a=rsa-sha256; c=relaxed/relaxed; d=stgolabs.net; s=dreamhost; t=1674756952; bh=BjAq7stYCEU0LfFp3xSDkbIfCy1Lt6xLAOHKbUfQFpc=; h=Date:From:To:Cc:Subject:Content-Type; b=ieib9aHKHrfLqCOC+rDVo4CAMUit/ODVDKl1jArfcQUCadb85FUQY/H0KEG0EamMM cryA9XIfSkiMOBZjpvwjkd68rMLg04rgzpJfTsEV8rlqUr3b0go58wvdQ6NyLBaHbq AIG+iCfCi/ABoRDRnpRu7+MlEeTjIy9RflpDEoxB9g8VeeddbCvvY7o5UGMaVa9+l0 8ao6U0i4NdOFQWQBYe+ov9zzXqI8ZfGyhrqzgT03Zu2QUNjzz1UL3xTVPPBUcBejs/ Yy2/ETZ59zv1XZgGdXNCwnGb++JAu62SpehNcb/7nMIB6o0SpuhnbF3YtUtjz+23Mw sWtnk0S8tQy9w== Date: Thu, 26 Jan 2023 09:48:59 -0800 From: Davidlohr Bueso To: Andrew Morton Cc: Suren Baghdasaryan , michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, paulmck@kernel.org, mingo@redhat.com, will@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, joelaf@google.com, minchan@google.com, jannh@google.com, shakeelb@google.com, tatashin@google.com, edumazet@google.com, gthelen@google.com, gurua@google.com, arjunroy@google.com, soheil@google.com, hughlynch@google.com, leewalsh@google.com, posk@google.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com Subject: Re: [PATCH v3 2/7] mm: introduce vma->vm_flags wrapper functions Message-ID: <20230126174859.x7rloojcuafbvjpo@offworld> Mail-Followup-To: Andrew Morton , Suren Baghdasaryan , michel@lespinasse.org, jglisse@google.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mgorman@techsingularity.net, willy@infradead.org, liam.howlett@oracle.com, peterz@infradead.org, ldufour@linux.ibm.com, paulmck@kernel.org, mingo@redhat.com, will@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, joelaf@google.com, minchan@google.com, jannh@google.com, shakeelb@google.com, tatashin@google.com, edumazet@google.com, gthelen@google.com, gurua@google.com, arjunroy@google.com, soheil@google.com, hughlynch@google.com, leewalsh@google.com, posk@google.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, kernel-team@android.com References: <20230125233554.153109-1-surenb@google.com> <20230125233554.153109-3-surenb@google.com> <20230125162419.13379944d6c0d4253d7bc88c@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20230125162419.13379944d6c0d4253d7bc88c@linux-foundation.org> User-Agent: NeoMutt/20220429 X-Stat-Signature: bkt3xo76yspwfmk7wwx6apg9wdp7t4at X-Rspam-User: X-Rspamd-Queue-Id: 83CF1A0021 X-Rspamd-Server: rspam06 X-HE-Tag: 1674756957-265198 X-HE-Meta: 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 c4Rbwz6O ezS5J4skXDDkzzl40dkvxQfZuesIDn4Teuezv6Qke6k0tKOY/VpdNWw+I9Pkt3SDS3tW1A+3+jBNPVLt4GrSzTZ3D7FvDayJ6Jg6bwq7QGDWMvwurntN5USPZdsNvRuT0r7eN38TqZjlxbNFb6onr0rBF27+0PxC+AkN43M6/lEKR4dPLa0fBkJJhey+Dt3vyvmiiGmhecbHymXZcKENprg+Kw2eSGSB3/IzLU48pB5zDf2gd+qHKo9dFtGBhP/TpqJg3pTa0mzdCt8lDIh9aoee25IACC46vZIYzkFXCnHApnZu1W0dlhbn6RNv4tUPHMJRCrqrJ2WKxuKFVQCRZHtPcR33jNI40909d4BbCFc1955sbeF4kNny8TnccYg2p3W+dH8ff88F+CHYIWwl7Hdo7TfPE3Ab5rTBz/11CTKAQFpPLhOjT/RY8dw== 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: On Wed, 25 Jan 2023, Andrew Morton wrote: >On Wed, 25 Jan 2023 15:35:49 -0800 Suren Baghdasaryan wrote: > >> 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. >> >> ... >> >> --- a/include/linux/mm.h >> +++ b/include/linux/mm.h >> +static inline void init_vm_flags(struct vm_area_struct *vma, >> +static inline void reset_vm_flags(struct vm_area_struct *vma, >> +static inline void set_vm_flags(struct vm_area_struct *vma, >> +static inline void clear_vm_flags(struct vm_area_struct *vma, >> +static inline void mod_vm_flags(struct vm_area_struct *vma, > >vm_flags_init(), vm_flags_reset(), etc? > >This would be more idiomatic and I do think the most-significant-first >naming style is preferable. I tend to prefer this naming yes, but lgtm regardless. Reviewed-by: Davidlohr Bueso