linux-kernel - Re: [PATCH next 0/3] iov: Optimise user copies

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Message-ID: <1083f491-2da2-4ba3-b85b-53a057af0e65@kernel.dk>
Date: Sat, 22 Mar 2025 08:36:25 -0600
From: Jens Axboe <axboe@...nel.dk>
To: David Laight <david.laight.linux@...il.com>, linux-kernel@...r.kernel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
 David Howells <dhowells@...hat.com>, Matthew Wilcox <willy@...radead.org>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH next 0/3] iov: Optimise user copies

On 3/21/25 4:45 PM, David Laight wrote:
> The speculation barrier in access_ok() is expensive.
> 
> The first patch removes the initial checks when reading the iovec[].
> The checks are repeated before the actual copy.
> 
> The second patch uses 'user address masking' if supported.
> 
> The third removes a lot of code for single entry iovec[].

Looks good to me:

Reviewed-by: Jens Axboe <axboe@...nel.dk>

-- 
Jens Axboe