linux-kernel - Re: [RFC PATCH 0/3] Introduce kernel small arrays (KSA)

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Message-ID: <1507130554.26687.8.camel@codethink.co.uk>
Date:   Wed, 04 Oct 2017 16:22:34 +0100
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Ilya Matveychikov <matvejchikov@...il.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/3] Introduce kernel small arrays (KSA)

On Tue, 2017-09-19 at 12:30 +0400, Ilya Matveychikov wrote:
> Hi guys,
> 
> Please review the approach of using small fixed-sized arrays to improve
> parsing of values like get_options() does.
> 
> This comes to me after fixing an overflow in get_options(). See the thread
> for details: https://lkml.org/lkml/2017/5/22/581
> 
> If the approach is OK I’ll suggest to replace all of get_options() calls
> to ksa_parse_ints() and remove get_options() at all.

You didn't cc the patches to me, and I can't find patch 3/3 at all.

I don't think the KSA() macro should be casting its argument.  Where the
cast is necessary, it ought to be explicit in the caller.

Similarly I think the BUILD_BUG_ON() in ksa_build_check() doesn't belong
there, but in whichever caller of ksa_parse_ints() requires struct
ksmall_array to have the same layout as a simple array of unsigned int.

Ben.

-- 
Ben Hutchings
Software Developer, Codethink Ltd.