From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from zeniv.linux.org.uk (zeniv.linux.org.uk [62.89.141.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6309A28504F for ; Tue, 21 Apr 2026 20:17:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.89.141.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776802674; cv=none; b=ei5IJlhnPvFTcPlrclqV30/QWj/3dyDSxk0vNRaOswjuYIr3Pb7mU0itw3V+dGL2rrpI3sg1HZpv6y/hVx9YMo8ryW8f14AibA0jgEbEn8GEM8CsDAL916xJMqXQY1/t65X55YssjUl2Kw8q9MHm6Ex3N8BXX7ajyXiQ7CgiLBc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776802674; c=relaxed/simple; bh=KfnbFnhXl5l+gEKvgs73Yb0h2IqpHCm5Z9HckyuX2x0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Zwb6ZUL2MwWGgAA+R4PP/8wwcQvbIvN9lIfHEP2jQ9OHRijmt/5K//wHJU5QKgv4+EaB5dXK9fWJ179L/7KXVVTHsuSQ1SonjmIPPReqEZEPY/GRdibaL9vQDG6Uex9s58XFaYSPV/Qrx605d5JeRc77+ppSHT4JQG693RnoMYc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk; spf=none smtp.mailfrom=ftp.linux.org.uk; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b=c3pjcWJQ; arc=none smtp.client-ip=62.89.141.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=ftp.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b="c3pjcWJQ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=linux.org.uk; s=zeniv-20220401; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Zmk5kCu+N+tLkVd3CGGCvLP7PJjgMTpvngzmVMjrx2c=; b=c3pjcWJQrzP/CnBpWyzEsOODaL IpEOkNzpKCQufKIBgcCtLaLUdZUbppx0takTo14jvYiuZqp8xdzYI2/2/zE6ytz6edrnoZVaXBINn JPEmEmWR5KBoLMUkb7GJpXXr2WpJ/yBbdmNVC89RRsjlV6OIKHaqQOQO8DOagfVA/ID96S42yJQEK COv/MUwpKx8WGbf98tfFzidVpMtpo8cZT5cjO3vZzZ215aM5cIi7+rZNbDFNSJkkI0AE9SmWzBAAF oO8B8dXd/IW7Vb1XqDIZX4sGQfU5XL2ad/lxjpDoMsHMCHcfaQJg1abFy6LMI9SMHcBV3/K3aKIVf elDkpJIg==; Received: from viro by zeniv.linux.org.uk with local (Exim 4.99.1 #2 (Red Hat Linux)) id 1wFHbT-00000004sv7-1ZFx; Tue, 21 Apr 2026 20:21:51 +0000 Date: Tue, 21 Apr 2026 21:21:51 +0100 From: Al Viro To: "Harry Yoo (Oracle)" Cc: Andrew Morton , Vlastimil Babka , Christoph Lameter , David Rientjes , Roman Gushchin , Hao Li , Alexei Starovoitov , Uladzislau Rezki , "Paul E . McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Zqiang , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , rcu@vger.kernel.org, linux-mm@kvack.org, Christian Brauner , Jan Kara Subject: Re: [PATCH 2/8] fs/dcache: use rcu_ptr instead of rcu_head for external names Message-ID: <20260421202151.GF3518998@ZenIV> References: <20260416091022.36823-1-harry@kernel.org> <20260416091022.36823-3-harry@kernel.org> Precedence: bulk X-Mailing-List: rcu@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: <20260416091022.36823-3-harry@kernel.org> Sender: Al Viro On Thu, Apr 16, 2026 at 06:10:16PM +0900, Harry Yoo (Oracle) wrote: > When a file name length exceeds 31 (DCACHE_INLINE_LEN-1), #ifdef CONFIG_64BIT # define DNAME_INLINE_WORDS 5 /* 192 bytes */ #else # ifdef CONFIG_SMP # define DNAME_INLINE_WORDS 9 /* 128 bytes */ # else # define DNAME_INLINE_WORDS 11 /* 128 bytes */ # endif #endif Where do you get that 31 from?