linux-kernel - Re: [PATCH v2 08/27] i2c: busses: remove memset after dmam_alloc

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Message-ID: <f97d130f-0906-05cb-6f08-bb84bf32ff02@linux.intel.com>
Date:   Fri, 28 Jun 2019 09:22:31 +0300
From:   Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To:     Fuqian Huang <huangfq.daxian@...il.com>
Cc:     Seth Heasley <seth.heasley@...el.com>,
        Neil Horman <nhorman@...driver.com>,
        Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/27] i2c: busses: remove memset after
 dmam_alloc_coherent

Hi

On 6/28/19 5:47 AM, Fuqian Huang wrote:
> In commit af7ddd8a627c
> ("Merge tag 'dma-mapping-4.21' of git://git.infradead.org/users/hch/dma-mapping"),
> dmam_alloc_coherent has already zeroed the memory.
> So memset is not needed.
> 
> Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
> ---
>   drivers/i2c/busses/i2c-ismt.c | 2 --
>   1 file changed, 2 deletions(-)
> 
It would be better to refer actual commit or commits that implement that 
zeroing rather than merge point in commit log if possible.

At quick look commit 518a2f1925c3 ("dma-mapping: zero memory returned 
from dma_alloc_*") is the one but I'm not really an expert here to say 
is that alone enough.

-- 
Jarkko