linux-kernel - Re: [PATCH v2 01/12] get rid of unlikely() on page_copy

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Message-ID: <Y14yCDdhW/QGOp+l@infradead.org>
Date:   Sun, 30 Oct 2022 01:12:56 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Christoph Hellwig <hch@...radead.org>,
        David Howells <dhowells@...hat.com>, willy@...radead.org,
        dchinner@...hat.com, Steve French <smfrench@...il.com>,
        Shyam Prasad N <nspmangalore@...il.com>,
        Rohith Surabattula <rohiths.msft@...il.com>,
        Jeff Layton <jlayton@...nel.org>,
        Ira Weiny <ira.weiny@...el.com>, torvalds@...ux-foundation.org,
        linux-cifs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 01/12] get rid of unlikely() on page_copy_sane() calls

This could explain why your are dropping the unlikely, 'cause just
from the page this is non-obvious.  Especially as the patch seems to
do a lot more than just removing an unlikely.