linux-kernel - Re: [PATCH v2] staging: vc04_services: add vchiq_pagelist

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Message-ID: <8760nzz21n.fsf@eliezer.anholt.net>
Date:   Mon, 07 Nov 2016 08:29:24 -0800
From:   Eric Anholt <eric@...olt.net>
To:     Michael Zoran <mzoran@...wfest.net>, gregkh@...uxfoundation.org
Cc:     swarren@...dotorg.org, lee@...nel.org, mzoran@...wfest.net,
        daniels@...labora.com, noralf@...nnes.org, popcornmix@...il.com,
        lstoakes@...il.com, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: vc04_services: add vchiq_pagelist_info structure

Michael Zoran <mzoran@...wfest.net> writes:

> The current dma_map_sg based implementation for bulk messages
> computes many offsets into a single allocation multiple times in
> both the create and free code paths.  This is inefficient,
> error prone and in fact still has a few lingering issues
> with arm64.
>
> This change replaces a small portion of that inplementation with
> new code that uses a new struct vchiq_pagelist_info to store the
> needed information rather then complex offset calculations.
>
> This improved implementation should be more efficient and easier
> to understand and maintain.
>
> Tests Run(Both Pass):
> vchiq_test -p 1
> vchiq_test -f 10

Looks good, and it's a nice cleanup.  Thanks!

Reviewed-by: Eric Anholt <eric@...olt.net>

I had one style note, which was that you're using an int and 0/1 for a
boolean value, but we like to use proper bools and true/false instead.
However, you're modifying code that was already using an int for related
booleans, so that can be a separate cleanup.

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