linux-kernel - Re: [PATCH 3/5] uml: Fix warning due to missing task

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Message-ID: <alpine.LNX.2.00.1004210143060.7579@pobox.suse.cz>
Date:	Wed, 21 Apr 2010 01:43:56 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Jan Kiszka <jan.kiszka@....de>
Cc:	Jeff Dike <jdike@...toit.com>,
	Amerigo Wang <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: [PATCH 3/5] uml: Fix warning due to missing task_struct
 declaration

On Tue, 20 Apr 2010, Jan Kiszka wrote:

> >>> We can't pull in linux/sched.h, so just declare the struct.
> >>>
> >> Did you meet any build error? If yes, please include it.
> > 
> > What does this patch fix, aside from being a bit cleaner?
> 
>   CC      arch/um/sys-i386/elfcore.o
> In file included from /data/linux-2.6/include/linux/elf.h:8,
>                  from /data/linux-2.6/arch/um/sys-i386/elfcore.c:2:
> /data/linux-2.6/arch/um/sys-i386/asm/elf.h:78: warning: ‘struct task_struct’ declared inside parameter list
> /data/linux-2.6/arch/um/sys-i386/asm/elf.h:78: warning: its scope is only this definition or declaration, which is probably not what you want
> 
> I guess not many people build against i386 hosts anymore, so this
> remained widely unnoticed.
> 
> > 
> > If it built before, without having a task_struct declaration, I think
> > that means that the elf_core_copy_fpregs was never used.  The
> > task_struct * in the declaration would become a private task_struct,
> > known only to the declaration.  If the implementation or callers have
> > the regular task_struct, it will be a different one, and the
> > prototypes will conflict due to the different types of the first
> > parameter.
> 
> This is just a forward declaration (that many arch elf header include),
> so no such problem exists.
> 
> BTW, to answer the other question in this thread: We have a circular
> dependency that prevents including sched.h.
> 
> I can add all these information to some v2 of this patch if it is
> required to get this merged. Please let me know.

I have updated the explanation in the changelog and applied the patch. If 
anyone has any objections still, please let me know.

Thanks,

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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