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Date: Tue, 23 Jun 2020 22:37:29 -0700 From: Eric Biggers <ebiggers@...nel.org> To: Daniel Rosenberg <drosen@...gle.com> Cc: Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org, Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>, linux-f2fs-devel@...ts.sourceforge.net, linux-fscrypt@...r.kernel.org, Alexander Viro <viro@...iv.linux.org.uk>, Richard Weinberger <richard@....at>, linux-mtd@...ts.infradead.org, Andreas Dilger <adilger.kernel@...ger.ca>, Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, Gabriel Krisman Bertazi <krisman@...labora.com>, kernel-team@...roid.com Subject: Re: [PATCH v9 1/4] unicode: Add utf8_casefold_hash On Tue, Jun 23, 2020 at 09:33:38PM -0700, Daniel Rosenberg wrote: > This adds a case insensitive hash function to allow taking the hash > without needing to allocate a casefolded copy of the string. It would be helpful to add a few more details in this commit message. Somewhat along the lines of: ->d_hash() for casefolding currently allocates memory, it needs to use GFP_ATOMIC due to ->d_hash() being called in rcu-walk mode, this is unreliable and inefficient, and this patch allows solving that problem by removing the need to allocate memory. - Eric
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