linux-kernel - Re: [PATCH 01/10] dm snapshot: Use kmalloc_array() in init_origin

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Date:   Thu, 29 Sep 2016 23:14:53 +0200
From:   Paul Bolle <pebolle@...cali.nl>
To:     Joe Perches <joe@...ches.com>, Andy Whitcroft <apw@...onical.com>
Cc:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        dm-devel@...hat.com, linux-raid@...r.kernel.org,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Shaohua Li <shli@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 01/10] dm snapshot: Use kmalloc_array() in
 init_origin_hash()

On Thu, 2016-09-29 at 13:56 -0700, Joe Perches wrote:
> It doesn't matter match either way to me.
> 
> The case for the unnecessary multiply with <= gcc 4.8 was
> removed with:
> 
> commit 91c6a05f72a996bee5133e76374ab3ad7d3b9b72
> Author: Alexey Dobriyan <adobriyan@...il.com>
> Date:   Tue Jul 26 15:22:08 2016 -0700
> 
>     mm: faster kmalloc_array(), kcalloc()
>     
>     When both arguments to kmalloc_array() or kcalloc() are known at compile
>     time then their product is known at compile time but search for kmalloc
>     cache happens at runtime not at compile time.
>     
>     Link: http://lkml.kernel.org/r/20160627213454.GA2440@p183.telecom.by
>     Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
>     Cc: Christoph Lameter <cl@...ux.com>
>     Cc: Pekka Enberg <penberg@...nel.org>
>     Cc: David Rientjes <rientjes@...gle.com>
>     Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
>     Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
>     Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>

You've lost me.

Why does this stop you fixing an apparently wrong checkpatch rule,
crude as parts of it are (ie, uppercase identifier must be a constant)?


Paul Bolle