linux-kernel - Re: [PATCH 2/3] checkpatch: Add error on use of attribute((weak)) or _

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Message-Id: <20141015125000.44353284288395e216659953@linux-foundation.org>
Date:	Wed, 15 Oct 2014 12:50:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Andy Whitcroft <apw@...onical.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] checkpatch: Add error on use of attribute((weak))
 or __weak

On Wed, 15 Oct 2014 12:45:48 -0700 Joe Perches <joe@...ches.com> wrote:

> On Wed, 2014-10-15 at 12:42 -0700, Andrew Morton wrote:
> > On Wed, 15 Oct 2014 12:32:08 -0700 Joe Perches <joe@...ches.com> wrote:
> > 
> > > Using weak can have unintended link defects.
> > > Emit an error on its use.
> > 
> > Well, we don't want a warning about use of __weak in function
> > definitions.  Only in declarations.
> 
> Why is that?

Because the problem we're trying to detect is when __weak is used on a
declaration.

This is OK:

foo.h:
extern int foo(void);
foo.c:
int __weak foo(void)
{
	...
}

But this is not OK:

foo.h:
extern __weak int foo(void);
foo.c:
int __weak foo(void)
{
	...
}

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