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From: "Yann E. MORIN" <yann.morin.1998@free.fr>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
	Sam Ravnborg <sam@ravnborg.org>, "H. Peter Anvin" <hpa@zytor.com>,
	Ingo Molnar <mingo@kernel.org>,
	Kyungsik Lee <kyungsik.lee@lge.com>,
	Michal Marek <mmarek@suse.cz>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-kbuild" <linux-kbuild@vger.kernel.org>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	CE Linux Developers List <celinux-dev@lists.celinuxforum.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	hyojun.im@lge.com, chan.jeong@lge.com,
	Andy Lee <raphael.andy.lee@gmail.com>,
	Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
	Russell King <rmk@arm.linux.org.uk>,
	Borislav Petkov <bp@alien8.de>,
	Florian Fainelli <florian@openwrt.org>,
	Yann Collet <yann.collet.73@gmail.com>,
	Chanho Min <chanho.min@lge.com>
Subject: Re: [PATCH -next 2/2] kbuild: fix for updated LZ4 tool with the new streaming format
Date: Thu, 18 Jul 2013 09:47:02 +0200	[thread overview]
Message-ID: <201307180947.02456.yann.morin.1998@free.fr> (raw)
In-Reply-To: <20130718003408.bb9d5b51.akpm@linux-foundation.org>

Andrew, All,

On Thursday 18 July 2013 09:34:08 Andrew Morton wrote:
> On Thu, 18 Jul 2013 09:22:58 +0200 Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> > On Thu, Jul 18, 2013 at 12:30 AM, Yann E. MORIN <yann.morin.1998@free.fr> wrote:
> > > On 2013-07-17 23:16 +0200, Sam Ravnborg spake thusly:
> > >> > We could extend the symbol option part to retreive values from a binary.
> > >> > Something like this:
> > >> >
> > >> > config FOOBAR
> > >> >         bool
> > >> >         option exec="true"
> > >> >
> > >> > FOOBAR would assume the value "y" if the command true has exit code == 0, otherwise "n".
> > >> > And similar conversions for other types.
> > >> >
> > >> > This only extendt Kconfig slightly - using an already present method to import
> > >> > external values.
> > >> Following is a quick patch implmenting this idea.
> > >> You need to run gperf manually to enable this.
> > >>
> > >> "gperf -C scripts/kconfig/zconf.gperf > scripts/kconfig/zconf.hash.c"
> > >>
> > >> I did not figure out how to use the built-in rules to generate this file :-(
> > >
> > > make REGENERATE_PARSERS=y menuconfig
> > >
> > >> I have tested this lightly - as we should discuss if this is a viable way forward.
> > >
> > > Instead of extending the Kconfig language, I was thinking (as initially
> > > suggested by Andrew) of generating a Kconfig file before all config
> > > targets, and source that Kconfig file from $(TOPDIR)/Kconfig.
> > 
> > I also prefer the generated Kconfig file.
> > It keeps all these checks in a single place, instead of spreading it over all
> > Kconfig files. This allows to keep better control over the list of checks, and
> > notice when it gets out-of-hand.
> 
> I prefer the "option exec" approach, actually.  That way the shell-outs
> are colocated with the code which uses

Indeed, but in this case, all the checks will be spread-out in the Kconfig
files, and not easily locatable. Having all in a single script will also
more easily raise eyebrows when that script appears in a diffstat. Noticing
the 'exec' option risks being a bit less easy.

But, that's not my call to decide. ;-)

> them and they will only be executed
> if you've actually selected that subsystem for building (I think?).

If I understand the code correctly (which is still to be proven), the
exec option is run at parse-time, once.

Regards,
Yann E. MORIN.

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +0/33 662376056 | Software  Designer | \ / CAMPAIGN     |   ^                |
| --==< O_o >==-- '------------.-------:  X  AGAINST      |  /e\  There is no  |
| http://ymorin.is-a-geek.org/ | (*_*) | / \ HTML MAIL    |  """  conspiracy.  |
'------------------------------'-------'------------------'--------------------'

WARNING: multiple messages have this Message-ID
From: yann.morin.1998@free.fr (Yann E. MORIN)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH -next 2/2] kbuild: fix for updated LZ4 tool with the new streaming format
Date: Thu, 18 Jul 2013 09:47:02 +0200	[thread overview]
Message-ID: <201307180947.02456.yann.morin.1998@free.fr> (raw)
In-Reply-To: <20130718003408.bb9d5b51.akpm@linux-foundation.org>

Andrew, All,

On Thursday 18 July 2013 09:34:08 Andrew Morton wrote:
> On Thu, 18 Jul 2013 09:22:58 +0200 Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> > On Thu, Jul 18, 2013 at 12:30 AM, Yann E. MORIN <yann.morin.1998@free.fr> wrote:
> > > On 2013-07-17 23:16 +0200, Sam Ravnborg spake thusly:
> > >> > We could extend the symbol option part to retreive values from a binary.
> > >> > Something like this:
> > >> >
> > >> > config FOOBAR
> > >> >         bool
> > >> >         option exec="true"
> > >> >
> > >> > FOOBAR would assume the value "y" if the command true has exit code == 0, otherwise "n".
> > >> > And similar conversions for other types.
> > >> >
> > >> > This only extendt Kconfig slightly - using an already present method to import
> > >> > external values.
> > >> Following is a quick patch implmenting this idea.
> > >> You need to run gperf manually to enable this.
> > >>
> > >> "gperf -C scripts/kconfig/zconf.gperf > scripts/kconfig/zconf.hash.c"
> > >>
> > >> I did not figure out how to use the built-in rules to generate this file :-(
> > >
> > > make REGENERATE_PARSERS=y menuconfig
> > >
> > >> I have tested this lightly - as we should discuss if this is a viable way forward.
> > >
> > > Instead of extending the Kconfig language, I was thinking (as initially
> > > suggested by Andrew) of generating a Kconfig file before all config
> > > targets, and source that Kconfig file from $(TOPDIR)/Kconfig.
> > 
> > I also prefer the generated Kconfig file.
> > It keeps all these checks in a single place, instead of spreading it over all
> > Kconfig files. This allows to keep better control over the list of checks, and
> > notice when it gets out-of-hand.
> 
> I prefer the "option exec" approach, actually.  That way the shell-outs
> are colocated with the code which uses

Indeed, but in this case, all the checks will be spread-out in the Kconfig
files, and not easily locatable. Having all in a single script will also
more easily raise eyebrows when that script appears in a diffstat. Noticing
the 'exec' option risks being a bit less easy.

But, that's not my call to decide. ;-)

> them and they will only be executed
> if you've actually selected that subsystem for building (I think?).

If I understand the code correctly (which is still to be proven), the
exec option is run at parse-time, once.

Regards,
Yann E. MORIN.

-- 
.-----------------.--------------------.------------------.--------------------.
|  Yann E. MORIN  | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +0/33 662376056 | Software  Designer | \ / CAMPAIGN     |   ^                |
| --==< O_o >==-- '------------.-------:  X  AGAINST      |  /e\  There is no  |
| http://ymorin.is-a-geek.org/ | (*_*) | / \ HTML MAIL    |  """  conspiracy.  |
'------------------------------'-------'------------------'--------------------'

  reply	other threads:[~2013-07-18  7:47 UTC|newest]

Thread overview: 110+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-06  8:42 [PATCH -next 1/2] arm: Remove enforced Os flag for LZ4 decompressor Kyungsik Lee
2013-05-06  8:42 ` Kyungsik Lee
2013-05-06  8:42 ` [PATCH -next 2/2] kbuild: fix for updated LZ4 tool with the new streaming format Kyungsik Lee
2013-05-06  8:42   ` Kyungsik Lee
2013-05-06  9:51   ` Borislav Petkov
2013-05-06  9:51     ` Borislav Petkov
2013-07-10  8:12     ` Geert Uytterhoeven
2013-07-10  8:12       ` Geert Uytterhoeven
2013-07-10  8:12       ` Geert Uytterhoeven
2013-07-10  9:36       ` Borislav Petkov
2013-07-10  9:36         ` Borislav Petkov
2013-07-10  9:36         ` Borislav Petkov
2013-07-10 18:28         ` Markus Trippelsdorf
2013-07-10 18:28           ` Markus Trippelsdorf
2013-07-10 18:28           ` Markus Trippelsdorf
2013-07-10 18:28           ` Markus Trippelsdorf
2013-07-10 20:01           ` Borislav Petkov
2013-07-10 20:01             ` Borislav Petkov
2013-07-10 20:01             ` Borislav Petkov
2013-07-10 20:01             ` Borislav Petkov
2013-07-11  4:34           ` Kyungsik Lee
2013-07-11  4:34             ` Kyungsik Lee
2013-07-11  4:34             ` Kyungsik Lee
2013-07-11  4:34             ` Kyungsik Lee
2013-07-11  9:46             ` [PATCH] .gitignore: ignore *.lz4 files Markus Trippelsdorf
2013-07-11  9:46               ` Markus Trippelsdorf
2013-07-11  9:46               ` Markus Trippelsdorf
2013-07-11  9:46               ` Markus Trippelsdorf
2013-07-12  7:56   ` [PATCH -next 2/2] kbuild: fix for updated LZ4 tool with the new streaming format Ingo Molnar
2013-07-12  7:56     ` Ingo Molnar
2013-07-12  8:01     ` Borislav Petkov
2013-07-12  8:01       ` Borislav Petkov
2013-07-12 10:13       ` Ingo Molnar
2013-07-12 10:13         ` Ingo Molnar
2013-07-12 10:23         ` Borislav Petkov
2013-07-12 10:23           ` Borislav Petkov
2013-07-12 11:18           ` Andrew Morton
2013-07-12 11:18             ` Andrew Morton
2013-07-12 12:06             ` Ingo Molnar
2013-07-12 12:06               ` Ingo Molnar
2013-07-12 12:13             ` Borislav Petkov
2013-07-12 12:13               ` Borislav Petkov
2013-07-12 12:34               ` Florian Fainelli
2013-07-12 12:34                 ` Florian Fainelli
2013-07-12 12:34                 ` Florian Fainelli
2013-07-12 12:46                 ` Borislav Petkov
2013-07-12 12:46                   ` Borislav Petkov
2013-07-12 12:46                   ` Borislav Petkov
2013-07-15 22:03     ` Andrew Morton
2013-07-15 22:03       ` Andrew Morton
2013-07-15 22:08       ` H. Peter Anvin
2013-07-15 22:08         ` H. Peter Anvin
2013-07-16  7:47         ` Andrew Morton
2013-07-16  7:47           ` Andrew Morton
2013-07-16  7:56           ` Andrew Morton
2013-07-16  7:56             ` Andrew Morton
2013-07-16  8:08             ` Yann E. MORIN
2013-07-16  8:08               ` Yann E. MORIN
2013-07-16  8:27               ` Andrew Morton
2013-07-16  8:27                 ` Andrew Morton
2013-07-16  9:05                 ` Borislav Petkov
2013-07-16  9:05                   ` Borislav Petkov
2013-07-16  9:12                   ` Yann E. MORIN
2013-07-16  9:12                     ` Yann E. MORIN
2013-07-16  9:22                     ` Borislav Petkov
2013-07-16  9:22                       ` Borislav Petkov
2013-07-16  9:32                       ` Yann E. MORIN
2013-07-16  9:32                         ` Yann E. MORIN
2013-07-16  9:38                         ` Borislav Petkov
2013-07-16  9:38                           ` Borislav Petkov
2013-07-16  9:45                           ` Yann E. MORIN
2013-07-16  9:45                             ` Yann E. MORIN
2013-07-16  9:59                             ` Borislav Petkov
2013-07-16  9:59                               ` Borislav Petkov
2013-07-16 10:04                               ` Florian Fainelli
2013-07-16 10:04                                 ` Florian Fainelli
2013-07-16 10:04                                 ` Florian Fainelli
2013-07-16 18:04               ` Sam Ravnborg
2013-07-16 18:04                 ` Sam Ravnborg
2013-07-17 21:16                 ` Sam Ravnborg
2013-07-17 21:16                   ` Sam Ravnborg
2013-07-17 21:44                   ` Borislav Petkov
2013-07-17 21:44                     ` Borislav Petkov
2013-07-17 22:30                   ` Yann E. MORIN
2013-07-17 22:30                     ` Yann E. MORIN
2013-07-17 23:22                     ` H. Peter Anvin
2013-07-17 23:22                       ` H. Peter Anvin
2013-07-18  8:02                       ` Geert Uytterhoeven
2013-07-18  8:02                         ` Geert Uytterhoeven
2013-07-18  8:02                         ` Geert Uytterhoeven
2013-07-18  7:22                     ` Geert Uytterhoeven
2013-07-18  7:22                       ` Geert Uytterhoeven
2013-07-18  7:22                       ` Geert Uytterhoeven
2013-07-18  7:34                       ` Andrew Morton
2013-07-18  7:34                         ` Andrew Morton
2013-07-18  7:34                         ` Andrew Morton
2013-07-18  7:47                         ` Yann E. MORIN [this message]
2013-07-18  7:47                           ` Yann E. MORIN
2013-07-18  7:47                           ` Yann E. MORIN
2013-07-18  7:52                           ` Andrew Morton
2013-07-18  7:52                             ` Andrew Morton
2013-07-18  7:52                             ` Andrew Morton
2013-07-18 20:47                     ` Sam Ravnborg
2013-07-18 20:47                       ` Sam Ravnborg
2013-07-16  9:13             ` Florian Fainelli
2013-07-16  9:13               ` Florian Fainelli
2013-07-16  9:13               ` Florian Fainelli
2013-07-16  9:25               ` Yann E. MORIN
2013-07-16  9:25                 ` Yann E. MORIN
2013-07-16  9:25                 ` Yann E. MORIN

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