linux-kernel - Re: [PATCH] select GENERIC_ATOMIC64 for c6x/score/unicore32 archs

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Date:	Wed, 15 Aug 2012 10:30:50 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Mark Salter <msalter@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org,
	Aurelien Jacquiot <a-jacquiot@...com>,
	linux-c6x-dev@...ux-c6x.org, Lennox Wu <lennox.wu@...il.com>,
	Guan Xuetao <gxt@...c.pku.edu.cn>
Subject: Re: [PATCH] select GENERIC_ATOMIC64 for c6x/score/unicore32 archs

On Tue, Aug 14, 2012 at 12:22:49PM -0400, Mark Salter wrote:
> On Tue, 2012-08-14 at 23:34 +0800, Fengguang Wu wrote:
> > Sorry I have no compilers for build testing these changes, however the
> > risk looks low and it's much better than to leave the arch broken,
> > considering that Eric will do atomic64_t in the core fs/namespace.c
> > code.
> > 
> > CC: "Eric W. Biederman" <ebiederm@...ssion.com>
> > Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
> > ---
> > 
> > Andrew: the arch maintainers have been CCed. Best is the maintainers
> > respond, test and perhaps take the corresponding change. Let's see how
> > this will work out..
> > 
> > 
> >  arch/c6x/Kconfig       |    1 +
> 
> The c6x port also needs this:
> 
> C6X: add L*_CACHE_SHIFT defines
>     
> C6X currently lacks L*_CACHE_SHIFT defines which are used in a few
> places in the generic kernel. This patch adds those missing defines.
>     
> Signed-off-by: Mark Salter <msalter@...hat.com>

Thanks for the quick fix! git grep shows this:

        lib/atomic64.c: addr >>= L1_CACHE_SHIFT;

So this patch is a prerequisite for the GENERIC_ATOMIC64 patch.

git grep also shows

        arch/score/include/asm/cache.h:#define L1_CACHE_SHIFT           4

        arch/unicore32/include/asm/cache.h:#define L1_CACHE_SHIFT (5)

So the other two archs are fine.

Thanks,
Fengguang
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