Re: [PATCH v2 27/27] sound: ppc: remove unneeded memset after dma_alloc_coherent
Le 28/06/2019 à 11:11, Fuqian Huang a écrit :
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.
Yes that looks appropriate. And it confirms it was already done on
powerpc, as that patch doesn't include any change in powerpc arch.
Christophe
Christophe Leroy 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
---
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);
Re: [alsa-devel] [PATCH v2 27/27] sound: ppc: remove unneeded memset after dma_alloc_coherent
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 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
> > > ---
> > > 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-de...@alsa-project.org
> https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
Re: [PATCH v2 27/27] sound: ppc: remove unneeded memset after dma_alloc_coherent
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.
Christophe Leroy 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
> > ---
> > 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);
> >
> >
Re: [PATCH v2 27/27] sound: ppc: remove unneeded memset after dma_alloc_coherent
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
---
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);
[PATCH v2 27/27] sound: ppc: remove unneeded memset after dma_alloc_coherent
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.
Signed-off-by: Fuqian Huang
---
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);
--
2.11.0
