linux-kernel - Re: [PATCH] include/asm-generic/io.h: add dummy fuctions to support 'COMPILE

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Date:	Wed, 3 Jul 2013 18:12:21 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Richard Weinberger <richard@....at>,
	Jeff Dike <jdike@...toit.com>,
	David Sharp <dhsharp@...gle.com>,
	"sfr@...b.auug.org.au" <sfr@...b.auug.org.au>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>,
	uml-user <user-mode-linux-user@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <trivial@...nel.org>, Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH] include/asm-generic/io.h: add dummy fuctions to support
 'COMPILE_TEST' in 'asm-generic'.

On Thu, Jul 04, 2013 at 08:57:34AM +0800, Chen Gang wrote:
> 'asm-generic' neither belongs to architectures nor belongs to modules,
> it provides public services to both modules and architectures.

That sentence does not make any sense to me.

> 'COMPILE_TEST=y' will let 'asm-generic' provide self checking sevices to
> both modules and architectures (especially with allmodconfig and
> "EXTRA_CFLAGS=-W")

No it doesn't.

> For modules (especially which will run under the specific architecture
> soon), the developer can find more compiling issues before they really
> support it.

Huh?

> For architectures, can let modules compile as much as possible (if
> "COMPILE_TEST=y"), it will give a better check for the architectures.
> 
> At present, most of architectures (include various machine/cpu in an
> architecture) can not pass compiling with 'allmodconfig'. One of the
> main reasons is the HW of the specific architecture does not support.
> 
> It is neither architectures issue nor modules issue, the root cause is:
> "now, 'asm-generic' doesn't provide the related necessary public
> services for it".

That's not what asm-generic is for at all.

confused,

greg k-h
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