linux-kernel - Re: [PATCH 00/10] percpu: Per cpu code simplification V3

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Date:	Tue, 8 Jan 2008 10:07:02 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	travis@....com
Cc:	Andrew Morton <akpm@...ux-foundation.org>, Andi Kleen <ak@...e.de>,
	Christoph Lameter <clameter@....com>,
	Jack Steiner <steiner@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/10] percpu: Per cpu code simplification V3


* travis@....com <travis@....com> wrote:

> This patchset simplifies the code that arches need to maintain to 
> support per cpu functionality. Most of the code is moved into arch 
> independent code. Only a minimal set of definitions is kept for each 
> arch.
> 
> The patch also unifies the x86 arch so that there is only a single 
> asm-x86/percpu.h
> 
> V1->V2:
> - Add support for specifying attributes for per cpu declarations (preserves
>   IA64 model(small) attribute).
>   - Drop first patch that removes the model(small) attribute for IA64
>   - Missing #endif in powerpc generic config /  Wrong Kconfig
>   - Follow Randy's suggestions on how to do the Kconfig settings
> 
> V2->V3:
>   - fix x86_64 non-SMP case
>   - change SHIFT_PTR to SHIFT_PERCPU_PTR
>   - fix various percpu_modcopy()'s to reference correct per_cpu_offset()
>   - s390 has a special way to determine the pointer to a per cpu area

thanks, i've picked up the x86 and core bits, for testing.

i had the patch below for v2, it's still needed (because i didnt apply 
the s390/etc. bits), right?

	Ingo

------------->
Subject: x86: let other arches build
From: Ingo Molnar <mingo@...e.hu>

let architectures which still have the DEFINE_PER_CPU/etc. build
properly.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 include/linux/percpu.h |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-x86.q/include/linux/percpu.h
===================================================================
--- linux-x86.q.orig/include/linux/percpu.h
+++ linux-x86.q/include/linux/percpu.h
@@ -14,6 +14,7 @@
 #endif
 
 #ifdef CONFIG_SMP
+#ifndef DEFINE_PER_CPU
 #define DEFINE_PER_CPU(type, name)					\
 	__attribute__((__section__(".data.percpu")))			\
 	PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name
@@ -32,6 +33,7 @@
 
 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
+#endif
 
 /* Enough to cover all DEFINE_PER_CPUs in kernel, including modules. */
 #ifndef PERCPU_ENOUGH_ROOM
--
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