linux-kernel - Re: [RESEND PATCH 1/1] headers_install.sh: Support _

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Date:   Wed, 27 Feb 2019 22:14:56 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Michael Forney <forney@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>
Subject: Re: [RESEND PATCH 1/1] headers_install.sh: Support __aligned(x) for
 uAPI headers

On Fri, Feb 22, 2019 at 8:37 PM Sakari Ailus
<sakari.ailus@...ux.intel.com> wrote:
>
> Hi Yamada-san,
>
> On Fri, Feb 22, 2019 at 01:36:03PM +0900, Masahiro Yamada wrote:
> > On Thu, Feb 21, 2019 at 10:29 PM Sakari Ailus
> > <sakari.ailus@...ux.intel.com> wrote:
> > >
> > > The headers-install.sh already supports __packed conversion to
> > > __attribute__((packed)) for uAPI headers but it does not support similar
> > > __aligned(x) conversion.
> > >
> > > Add support for __aligned(x).
> >
> >
> > I am not a big fan of sed scripting in headers_install.sh
> >
> > Is it a problem to write __attribute__((aligned(x)) in UAPI headers?
>
> Not really as such. __packed is supported in uAPI headers so I thought
> __aligned should probably be as well. One factor here would seem to be that
> __packed is way more common than __aligned is.
>
> FWIW, a corresponding change has been done to scripts/kernel-doc; see
> commit 3d9bfb19bd705f503ac7afc2776d5d56dab88858 so kerneldoc does correctly
> handle that now.

I am fine with using __aligned(x) shorthand for kernel-space code.

For UAPI headers, we get it back to __attribute__(aligned(x)) anyway,
and I'd like to minimize the complex text processing.


Since __aligned(x) takes an argument,
this is not feasible to process it by sed.


For example, please see
include/uapi/linux/netfilter_bridge/ebtables.h



If

__attribute__ ((aligned (__alignof__(struct ebt_replace))));

is converted into

__aligned(__alignof__(struct ebt_replace))


it would be difficult to revert it by sed









> Cc Jonathan.
>
> >
> >
> >
> > > Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> > > ---
> > >  scripts/headers_install.sh | 1 +
> > >  1 file changed, 1 insertion(+)
> > >
> > > diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
> > > index 593f8879c641..9ed490f33a3a 100755
> > > --- a/scripts/headers_install.sh
> > > +++ b/scripts/headers_install.sh
> > > @@ -36,6 +36,7 @@ do
> > >                 -e 's/__attribute_const__([[:space:]]|$)/\1/g' \
> > >                 -e 's@...nclude <linux/compiler(|_types).h>@@' \
> > >                 -e 's/(^|[^a-zA-Z0-9])__packed([^a-zA-Z0-9_]|$)/\1__attribute__((packed))\2/g' \
> > > +               -e 's/(^|[^a-zA-Z0-9])__aligned(\([0-9 ]*\))([^a-zA-Z0-9_]|$)/\1__attribute__((aligned\2))\3/g' \
> > >                 -e 's/(^|[[:space:](])(inline|asm|volatile)([[:space:](]|$)/\1__\2__\3/g' \
> > >                 -e 's@#(ifndef|define|endif[[:space:]]*/[*])[[:space:]]*_UAPI@#\1 @' \
> > >                 "$SRCDIR/$i" > "$OUTDIR/$FILE.sed" || exit 1
> > > --
> > > 2.11.0
> > >
> >
> >
> > --
> > Best Regards
> > Masahiro Yamada
>
> --
> Sakari Ailus
> sakari.ailus@...ux.intel.com



--
Best Regards
Masahiro Yamada