From: Takashi Iwai <tiwai@suse.de>
To: Fuqian Huang <huangfq.daxian@gmail.com>
Cc: Rob Herring <robh@kernel.org>,
alsa-devel@alsa-project.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org,
Richard Fontana <rfontana@redhat.com>,
Paul Mackerras <paulus@samba.org>,
Thomas Gleixner <tglx@linutronix.de>,
linuxppc-dev@lists.ozlabs.org,
Allison Randal <allison@lohutok.net>
Subject: Re: [alsa-devel] [PATCH v2 27/27] sound: ppc: remove unneeded memset after dma_alloc_coherent
Date: Fri, 28 Jun 2019 11:17:42 +0200 [thread overview]
Message-ID: <s5hftnu6pc9.wl-tiwai@suse.de> (raw)
In-Reply-To: <CABXRUiT6jSP2xL9JyqngS9KBx_=fZ13x0UGGFPnQPrfh-_N5xQ@mail.gmail.com>
On Fri, 28 Jun 2019 11:11:08 +0200,
Fuqian Huang wrote:
>
> The merge commit log tells (dma-mapping: zero memory returned from
> dma_alloc_* and deprecating the dma_zalloc_coherent).
> I used this commit just want to say that dma_alloc_coherent has
> zeroed the allocated memory.
> Sorry for this mistake.
>
> Maybe this commit 518a2f1925c3("dma-mapping: zero memory returned from
> dma_alloc_*") is correct.
Are you going to resubmit v3 patchset? If the correction is specific
to this patch, I can correct the description in my side, too...
thanks,
Takashi
>
> Christophe Leroy <christophe.leroy@c-s.fr> 於 2019年6月28日週五 下午4:59寫道:
>
> >
> >
> >
> > Le 28/06/2019 à 04:50, Fuqian Huang a écrit :
> > > In commit af7ddd8a627c
> > > ("Merge tag 'dma-mapping-4.21' of git://git.infradead.org/users/hch/dma-mapping"),
> > > dma_alloc_coherent has already zeroed the memory.
> > > So memset is not needed.
> >
> > You are refering to a merge commit, is that correct ?
> >
> > I can't see anything related in that commit, can you please pinpoint it ?
> >
> > As far as I can see, on powerpc the memory has always been zeroized
> > (since 2005 at least).
> >
> > Christophe
> >
> > >
> > > Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
> > > ---
> > > sound/ppc/pmac.c | 1 -
> > > 1 file changed, 1 deletion(-)
> > >
> > > diff --git a/sound/ppc/pmac.c b/sound/ppc/pmac.c
> > > index 1b11e53f6a62..1ab12f4f8631 100644
> > > --- a/sound/ppc/pmac.c
> > > +++ b/sound/ppc/pmac.c
> > > @@ -56,7 +56,6 @@ static int snd_pmac_dbdma_alloc(struct snd_pmac *chip, struct pmac_dbdma *rec, i
> > > if (rec->space == NULL)
> > > return -ENOMEM;
> > > rec->size = size;
> > > - memset(rec->space, 0, rsize);
> > > rec->cmds = (void __iomem *)DBDMA_ALIGN(rec->space);
> > > rec->addr = rec->dma_base + (unsigned long)((char *)rec->cmds - (char *)rec->space);
> > >
> > >
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
next prev parent reply other threads:[~2019-06-28 9:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-28 2:50 [PATCH v2 27/27] sound: ppc: remove unneeded memset after dma_alloc_coherent Fuqian Huang
2019-06-28 8:59 ` Christophe Leroy
2019-06-28 9:11 ` Fuqian Huang
2019-06-28 9:17 ` Takashi Iwai [this message]
2019-06-28 9:48 ` Christophe Leroy
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=s5hftnu6pc9.wl-tiwai@suse.de \
--to=tiwai@suse.de \
--cc=allison@lohutok.net \
--cc=alsa-devel@alsa-project.org \
--cc=gregkh@linuxfoundation.org \
--cc=huangfq.daxian@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=paulus@samba.org \
--cc=rfontana@redhat.com \
--cc=robh@kernel.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).