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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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)
{
	...
}

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/