linux-kernel - Re: [PATCH 05/34] PCI: Use a weak symbol for the empty version of pcibios_add_platform

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Message-ID: <20070712005447.GY9704@parisc-linux.org>
Date:	Wed, 11 Jul 2007 18:54:47 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-pci@...ey.karlin.mff.cuni.cz,
	Michael Ellerman <michael@...erman.id.au>,
	linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...l.org>
Subject: Re: [PATCH 05/34] PCI: Use a weak symbol for the empty version of pcibios_add_platform_entries()

On Wed, Jul 11, 2007 at 05:39:23PM -0700, Greg KH wrote:
> > This seems like a regression.  We go from having an empty inline
> > function that gets optimised away to 0 to having a function call to a
> > trivial function.  And on any architecture that *does* define this,
> > (unless I misunderstand the GCC manual), we still include the weak
> > definition, thus wasting space.
> 
> Yeah, but it can be a big pain to add it to every architecture when only
> 1 or two need it, which is why I see people using the week symbol stuff
> more and more, right?  This is just following that trend.

But it's already there.  Deleting it now is pointless.

If someone really wants to unify it, better to do:

#ifndef PCIBIOS_PLATFORM_ENTRIES
static inline void pcibios_add_platform_entries(struct pci_dev *dev)
{
}
#endif

in <linux/pci.h> and then PPC can #define PCIBIOS_PLATFORM_ENTRIES
and do its own funky stuff.  This weak symbol stuff has its uses, but
I don't think this is an appropriate use.

-- 
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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