linux-kernel - Re: [PATCH] dmaengine: xilinx_dma: Remove __aligned attribute on zynqmp_dma_desc

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Date:   Thu, 25 Oct 2018 11:18:05 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     vkoul@...nel.org, dan.j.williams@...el.com,
        michal.simek@...inx.com, dmaengine@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dmaengine: xilinx_dma: Remove __aligned attribute on zynqmp_dma_desc_ll

On Thu, Oct 25, 2018 at 11:14 AM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> On Thu, Oct 25, 2018 at 11:11:22AM -0700, Nick Desaulniers wrote:
> > On Thu, Oct 25, 2018 at 11:06 AM Nathan Chancellor
> > <natechancellor@...il.com> wrote:
> > >
> > > Clang warns:
> > >
> > > drivers/dma/xilinx/zynqmp_dma.c:166:4: warning: attribute 'aligned' is
> > > ignored, place it after "struct" to apply attribute to type declaration
> > > [-Wignored-attributes]
> > > }; __aligned(64)
> > >    ^
> > > ./include/linux/compiler_types.h:200:38: note: expanded from macro
> > > '__aligned'
> > > #define __aligned(x)            __attribute__((aligned(x)))
> > >                                                ^
> > > 1 warning generated.
> > >
> > > As Nick pointed out in the previous version of this patch, the author
> > > likely intended for this struct to be 8-byte (64-bit) aligned, not
> > > 64-byte, which is the default. Remove the hanging __aligned attribute.
> >
> > Here was the v1 discussion, for reference.
> > https://lkml.org/lkml/2018/9/12/4
> >
> > Thanks for sending the update Nathan.  One thing I recommend doing is
> > including the version in the [PATCH] subject line, ie. [PATCH v2].
> > `git format-patch` can do this automatically for you, ex.
> > $ git format-patch -v2 HEAD~
> >
> > >
> > > Fixes: b0cc417c1637 ("dmaengine: Add Xilinx zynqmp dma engine driver support")
> > > Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
> > > Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
> > > Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> > > ---
> >
> > Then below this line, you can include the notes about v1 -> v2
> > changes. (interdiff notes to the reviewers that get discarded from the
> > commit message).  I think I've seen you use the versioning before, so
> > sorry if I'm restating something you already know.
> >
>
> No, that's fine, I completely forgot all the versioning for this patch
> as I was rushing, sorry about that!

No worries.  There's a lot to juggle when sending a patch and I miss
these all the time (did I run checkpatch, did I cc the folks added to
v1 that get_maintainer did not suggest, did I ...) and the version
info of the patch gets discarded anyways once committed.

>
> > Thanks for the patch.
> > Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> >
>
> Thanks for the review!
> Nathan
>
> > >  drivers/dma/xilinx/zynqmp_dma.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c
> > > index c74a88b65039..73de6a6179fc 100644
> > > --- a/drivers/dma/xilinx/zynqmp_dma.c
> > > +++ b/drivers/dma/xilinx/zynqmp_dma.c
> > > @@ -163,7 +163,7 @@ struct zynqmp_dma_desc_ll {
> > >         u32 ctrl;
> > >         u64 nxtdscraddr;
> > >         u64 rsvd;
> > > -}; __aligned(64)
> > > +};
> > >
> > >  /**
> > >   * struct zynqmp_dma_desc_sw - Per Transaction structure
> > > --
> > > 2.19.1
> > >
> >
> >
> > --
> > Thanks,
> > ~Nick Desaulniers



-- 
Thanks,
~Nick Desaulniers