From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f48.google.com (mail-wr1-f48.google.com [209.85.221.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8BF303EDAD0 for ; Fri, 6 Feb 2026 13:41:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.48 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770385297; cv=none; b=HiGKXNy67Kf7fldbN0LQL8d1pVsOldaQnOFm2IkFPU1ueipvVuxEHeYUbaquDfJHPNtYCLtXj5m4bvBFxVujBnV2CCRVFcN4JX5c/galppiKK/yq4krKSKK6gTHaroCOgBsk3ppX5g/gQis7OAVOyGbcnvzvPOLZXWNddJ5Hzpk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770385297; c=relaxed/simple; bh=+OZMpUB4NB9Unpm7VBjK4a4FOY+JLHJZXxHyl2rpuo0=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; b=fsd5/Jvr9VTn0sunVUOarIOk3K8nQHrJFUwBGznuZWp9SqtMKAzZ68OsTwm/JoRJ+DUJ/ujW3SwCXWaFjiORHZYjlvrHBWLGkdtQHDgOJPOurPQA01FSvovgd7+pBMeffiy+4NnffgBWGsc5w97zcf8Zv42Uj1P4nuXbYlySl2M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=cOyqQm4w; arc=none smtp.client-ip=209.85.221.48 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="cOyqQm4w" Received: by mail-wr1-f48.google.com with SMTP id ffacd0b85a97d-4362c932df8so401249f8f.1 for ; Fri, 06 Feb 2026 05:41:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1770385296; x=1770990096; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:message-id:subject:cc :to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=de3L1Y43pQAlWgG037quWHVZGctmRcLtI04VYJ4LOZw=; b=cOyqQm4whw7FEyCNXGQmsqlka4Mxg02pffu3lfTQtDtTPwvf69WAKZfBNkHBKk8KDU 2Hdjid6fhDBnN/KTYPFAUecDABxZD13G4YMFKOy/pI6Y8bh7rx6s0hMY7ACfwVgm5ux4 i1lQM7+O+iyOeaYuIaWD3y3zzG7KKuKtr3UkFB6jVnMdx6qpqAwcob0eOhQLYj30EFN1 zQV02dKXeU7UZOXVpExSbV102Q3ZgcYXI8xINb58DiSKCNsy5rpqmyW0250E/6zs4rJq pTxqPb2Ug/8keIr5zmNTVuhMgv84u9M5evY7gZQyhsnPEwwQweBTUUextQ4WomfYMSdl 6bFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770385296; x=1770990096; h=in-reply-to:content-disposition:mime-version:message-id:subject:cc :to:from:date:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=de3L1Y43pQAlWgG037quWHVZGctmRcLtI04VYJ4LOZw=; b=LScF3PQ9p6/jJ5HmAQJ2JphNW9r5xFEMkRjj2M0waWQM8YwBq93Mk5f+FTQVLT3X0K 0XIb5kKdmoUI4yH17Fo9xdV0KkYRI/38KDKEJMQO3vRzFc1JHVhol9+eAvwbKUAd8jTU doq4RsevgOW1MLA5R3pkAs4VeHHqXByNVcHKnNUD2xfLXeEsEwLDjSn7eiccFTC1RmZr 8w2FpvuHBTN1kc+UpQDU15h9/blEcJQnxZy5ZFYVAMDplTxfLNlzKuLaZnLE7Ete6l6E DLsvq6aJlEK1ZXwzCd1Yu7VuDG4AaIC0Sm6uJ3f1uYGmU92yCmCRjPLgkylyidyEBZ65 Jx+w== X-Gm-Message-State: AOJu0YyjoB3H1et706yhNi+/TBAg4WfJoCfKeNQuYUyYl9ZvpJaf95JF zDyng0ZeKwLNp77K34fbRZ4w+uArc9JJssXVJM9/FdKki8UyYtIwDPBDWpoTOFl6JNs= X-Gm-Gg: AZuq6aJQHuTtn+Px4XXpjHYhNbT0U8c6hY49MWm90P8yDm7NBjLK6t16SI4LI1Agqh3 g5zokAaGSnWWyAAbyvfRZK8H4Qri6sHsBrRZjd0esjz4JFXdcWo1Pyv/gqsBo47Js5K/ZzSMSg1 //hYSP9eOZHHZz1RrNN0bty4Ag3NhGJTYqxIhdpMjAnXkVLZjYpDNq7P3LHQQvczAIvBV5LFbHu FrLveIF/czRsfTZm6GjnKdLezia4ZVCsX8zPVq17sBIH0qFOgAsw138XDwqkaOHTy2uMFXxUWr4 khguKy3wAlvw1nxvQOoH3dUjAniyYY9Pt3GNCHdSMfdR/KcXWVn6lGx14sl/dU/XXi89lburUeV PcKOsAzHmT6tQVdKZejsPis3XaO69pUszCzgZ8yoI+hOoyIXsYPvtmysfOvjizlOIFFKLdeaixo 60f745u9SSU7PbXK// X-Received: by 2002:a05:6000:2410:b0:432:c0e6:cfcc with SMTP id ffacd0b85a97d-4362937855bmr4814517f8f.23.1770385295867; Fri, 06 Feb 2026 05:41:35 -0800 (PST) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4362972fc1bsm6103719f8f.28.2026.02.06.05.41.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Feb 2026 05:41:35 -0800 (PST) Date: Fri, 6 Feb 2026 16:41:32 +0300 From: Dan Carpenter To: Jens Axboe Cc: linux-block@vger.kernel.org, linux-kernel Subject: [bug report] bio: add allocation cache abstraction Message-ID: Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: [ Smatch checking is paused while we raise funding. #SadFace https://lore.kernel.org/all/aTaiGSbWZ9DJaGo7@stanley.mountain/ -dan ] Hello Jens Axboe, Commit be4d234d7aeb ("bio: add allocation cache abstraction") from Mar 8, 2021 (linux-next), leads to the following Smatch static checker warning: block/bio.c:790 bio_cpu_dead() error: potential null dereference 'bs'. (hlist_entry_safe() returns null) block/bio.c 785 static int bio_cpu_dead(unsigned int cpu, struct hlist_node *node) 786 { 787 struct bio_set *bs; 788 789 bs = hlist_entry_safe(node, struct bio_set, cpuhp_dead); --> 790 if (bs->cache) { It doesn't really make sense to use hlist_entry_safe() instead of hlist_entry() if we're not going to check for NULL. 791 struct bio_alloc_cache *cache = per_cpu_ptr(bs->cache, cpu); 792 793 bio_alloc_cache_prune(cache, -1U); 794 } 795 return 0; 796 } regards, dan carpenter