linux-kernel - RE: [RFC PATCH] iov_iter: Convert iterate*() to inline funcs

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Date:   Tue, 15 Aug 2023 11:12:57 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'David Howells' <dhowells@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
        Christian Brauner <christian@...uner.io>,
        Matthew Wilcox <willy@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
CC:     "jlayton@...nel.org" <jlayton@...nel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC PATCH] iov_iter: Convert iterate*() to inline funcs

From: David Howells
> Sent: 11 August 2023 15:32
> 
> Convert the iov_iter iteration macros to inline functions to make the code
> easier to follow.  Ideally, the optimiser would produce much the same code
> in both cases, but the revised code ends up a bit bigger.
...

Actually quite typical because inlining happens much later on.
I suspect that the #define benefits from the compile front-end
optimising constants.

	David

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