linux-kernel - Re: [PATCH] modules: add default loader hook implementations

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Message-Id: <201106271305.44746.arnd@arndb.de>
Date:	Mon, 27 Jun 2011 13:05:44 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Jonas Bonn <jonas@...thpole.se>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	monstr@...str.eu, cmetcalf@...era.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] modules: add default loader hook implementations

On Monday 27 June 2011, Geert Uytterhoeven wrote:
> >> I don't care much either way, you would get my Ack for both solutions.
> >> The __weak approach would definitely make a simpler patch, and the
> >> patch you sent adds extra complexity because of the
> >> asm_generic_moduleloader_hooks macro you used to avoid having to
> >> change all other architectures.
> >
> > I think you misread me.  If all else is equal, I dislike weak functions.
> > But AFAICT the two standard mechanisms are #ifdef HAVE_ARCH and __weak.
> > Inventing a third one is not going to be a win.
> 
> It's not inventing a new one, the third one is already in use.

True. In fact, we are (slowly) migrating away from HAVE_ARCH_* elsewhere.
In include/asm-generic/*.h, the common method is now to #define the exact
symbol if an architecture wants to override the generic version.

Weak symbols are fairly obscure in comparison, but they are actively
used by a few architectures (mips, sh) and some core code in kernel/
and mm/.

	Arnd
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