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Sun, 6 Sep 2026 11:01:59 +0000 (GMT) Received: from [9.61.37.159] (unknown [9.61.37.159]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Sun, 6 Sep 2026 11:01:59 +0000 (GMT) Message-ID: Date: Sun, 6 Sep 2026 16:31:58 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/3] blk-cgroup: move async bio punt state to blkcg To: Yu Kuai , Jens Axboe , Tejun Heo , Josef Bacik , Johannes Weiner , =?UTF-8?Q?Michal_Koutn=C3=BD?= Cc: Yu Kuai , Christoph Hellwig , Tao Cui , Jan Kara , Jonathan Corbet , Shuah Khan , Coly Li , Kent Overstreet , Alasdair Kergon , Mike Snitzer , Mikulas Patocka , Benjamin Marzinski , Song Liu , Li Nan , Xiao Ni , Pankaj Gupta , Dan Williams , Vishal Verma , Dave Jiang , Alison Schofield , Ira Weiny , Andreas Gruenbacher , Matthew Wilcox , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, dm-devel@lists.linux.dev, linux-raid@vger.kernel.org, nvdimm@lists.linux.dev, virtualization@lists.linux.dev, gfs2@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org References: <20260823133045.970199-1-yukuai@kernel.org> <20260823133045.970199-4-yukuai@kernel.org> Content-Language: en-US From: Nilay Shroff In-Reply-To: <20260823133045.970199-4-yukuai@kernel.org> Content-Type: text/plain; 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> > +#ifdef CONFIG_BLK_CGROUP_PUNT_BIO > + spinlock_t async_bio_lock; /* protects async_bios */ > + struct bio_list async_bios; > + struct work_struct async_bio_work; > +#endif > #ifdef CONFIG_BLK_CGROUP_FC_APPID > char fc_app_id[FC_APPID_LEN]; > #endif > #ifdef CONFIG_CGROUP_WRITEBACK > struct list_head cgwb_list; As I mentioned, Clang context annotations are now officially supported in the block layer. Since you're touching this code, I suggest annotating async_bios with __guarded_by(&async_bio_lock) as well. This would allow the Clang thread-safety analyzer to verify that every access to async_bios is properly protected by async_bio_lock. Thanks, --Nilay