linux-kernel - Re: [patch 11/14] Powerpc: Use generic per cpu

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Message-ID: <18252.54275.429917.929763@cargo.ozlabs.ibm.com>
Date:	Wed, 28 Nov 2007 13:35:47 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Kumar Gala <galak@...nel.crashing.org>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 11/14] Powerpc: Use generic per cpu

Christoph Lameter writes:

> On Wed, 28 Nov 2007, Paul Mackerras wrote:
> 
> > Did you try both 32-bit (CONFIG_64BIT=n) and 64-bit (CONFIG_64BIT=y)
> > configurations?  The paca only exists in 64-bit kernels.
> 
> I build both and there is no dependency on 32bit or 64 bit in 
> include/asm-powerpc/percpu.h. Both access the paca (whatever that is).

Look at line 3 of include/asm-powerpc/percpu.h:

#ifdef __powerpc64__

As far as I can see, after applying your series of patches, I end up
with an unbalanced #ifdef in include/asm-powerpc/percpu.h.  I see 3
#ifdef/#ifndef, but only two #endifs.  It needs another #endif after
the #endif /* SMP */ to match the #ifdef __powerpc64__.  With that
change it looks OK, since 32-bit uses asm-generic/percpu.h for both
SMP and UP.

Paul.
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