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

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Message-ID: <20190629111201.GD1685@kunai>
Date:   Sat, 29 Jun 2019 13:12:01 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Cc:     Fuqian Huang <huangfq.daxian@...il.com>,
        Seth Heasley <seth.heasley@...el.com>,
        Neil Horman <nhorman@...driver.com>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/27] i2c: busses: remove memset after
 dmam_alloc_coherent

On Fri, Jun 28, 2019 at 09:22:31AM +0300, Jarkko Nikula wrote:
> 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.

Fuqian, can you clarify if the commit pointed by Jarkko is enough as a
reference or if it really needs the merge tag?

Also, please include the tags you collected in v1 when sending v2 (and
there was no significant code change).


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