linux-kernel - Re: [PATCH] m68k: add generic atomic64

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Date:	Sun, 12 Aug 2012 22:55:52 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Greg Ungerer <gerg@...inux.org>, linux-m68k@...ts.linux-m68k.org,
	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] m68k: add generic atomic64_t support

On Sun, Aug 12, 2012 at 04:47:31PM +0200, Geert Uytterhoeven wrote:
> Hi Fengguang,
> 
> On Sun, Aug 12, 2012 at 4:23 PM, Fengguang Wu <fengguang.wu@...el.com> wrote:
> > This fixes build errors like:
> >
> > fs/namespace.c:2290:1: error: unknown type name 'atomic64_t'
> > fs/namespace.c:2290:1: error: implicit declaration of function 'ATOMIC64_INIT' [-Werror=implicit-function-declaration]
> > fs/namespace.c:2290:1: error: initializer element is not constant
> > fs/namespace.c: In function 'alloc_mnt_ns':
> > fs/namespace.c:2299:2: error: implicit declaration of function 'atomic64_add_return' [-Werror=implicit-function-declaration]
> 
> > Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
> > ---
> >  arch/m68k/Kconfig |    1 +
> >  1 file changed, 1 insertion(+)
> >
> > --- linux.orig/arch/m68k/Kconfig        2012-08-12 21:15:49.730533572 +0800
> > +++ linux/arch/m68k/Kconfig     2012-08-12 22:19:56.202624988 +0800
> > @@ -12,6 +12,7 @@ config M68K
> >         select FPU if MMU
> >         select ARCH_WANT_IPC_PARSE_VERSION
> >         select ARCH_USES_GETTIMEOFFSET if MMU && !COLDFIRE
> > +       select GENERIC_ATOMIC64
> 
> For several CPU types (68020/68030/68040/68080), this is already selected in
> arch/m68k/Kconfig.cpu
> So probably this select should be moved to cover more CPU types?
 
Got it! If possible, will you do that move? You surely know it much
better than me :)

> For which config do you get this build error? I can't seem to trigger it in
> current mainline nor -next with m5475evb_defconfig.
> Does it depend on additional patches to introduce more atomic64 uses?

Yes, it's triggered on Eric's userns tree. I just sent out another
email with details.  Sorry that I blindly used it as an example in the
changelog, w/o foreseeing it caused reproduce trouble on your side..

Thanks,
Fengguang
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