linux-kernel - Re: [v2 PATCH 2/3] EDAC: Add edac_device_alloc

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Date:	Wed, 15 Apr 2009 15:27:30 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Harry Ciao <qingtao.cao@...driver.com>
Cc:	norsk5@...oo.com, michael@...erman.id.au,
	bluesmoke-devel@...ts.sourceforge.net, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [v2 PATCH 2/3] EDAC: Add edac_device_alloc_index()

On Mon, 13 Apr 2009 14:05:15 +0800
Harry Ciao <qingtao.cao@...driver.com> wrote:

> Add edac_device_alloc_index(), because for MAPLE platform there may
> exist several EDAC driver modules that could make use of
> edac_device_ctl_info structure at the same time. The index allocation
> for these structures should be taken care of by EDAC core.
> 

From: Andrew Morton <akpm@...ux-foundation.org>

keep things neat.  Also avoids having global identifier device_index
shadowed by local identifier device_index.

Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Doug Thompson <norsk5@...oo.com>
Cc: Harry Ciao <qingtao.cao@...driver.com>
Cc: Kumar Gala <galak@...e.crashing.org>
Cc: Michael Ellerman <michael@...erman.id.au>
Cc: Paul Mackerras <paulus@...ba.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 drivers/edac/edac_device.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -puN drivers/edac/amd8111_edac.c~edac-add-edac_device_alloc_index-cleanup drivers/edac/amd8111_edac.c
diff -puN drivers/edac/edac_core.h~edac-add-edac_device_alloc_index-cleanup drivers/edac/edac_core.h
diff -puN drivers/edac/edac_device.c~edac-add-edac_device_alloc_index-cleanup drivers/edac/edac_device.c
--- a/drivers/edac/edac_device.c~edac-add-edac_device_alloc_index-cleanup
+++ a/drivers/edac/edac_device.c
@@ -37,7 +37,6 @@
  */
 static DEFINE_MUTEX(device_ctls_mutex);
 static LIST_HEAD(edac_device_list);
-static atomic_t device_indexes = ATOMIC_INIT(0);
 
 #ifdef CONFIG_EDAC_DEBUG
 static void edac_device_dump_device(struct edac_device_ctl_info *edac_dev)
@@ -499,6 +498,8 @@ void edac_device_reset_delay_period(stru
  */
 int edac_device_alloc_index(void)
 {
+	static atomic_t device_indexes = ATOMIC_INIT(0);
+
 	return atomic_inc_return(&device_indexes) - 1;
 }
 EXPORT_SYMBOL_GPL(edac_device_alloc_index);
_

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