linux-kernel - [PATCH 16/21] staging/zsmalloc: don't use pgtable-mapping from modules

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Date:	Tue, 23 Apr 2013 18:30:48 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Nitin Gupta <ngupta@...are.org>
Subject: [PATCH 16/21] staging/zsmalloc: don't use pgtable-mapping from modules

Building zsmalloc as a module does not work on ARM because it uses
an interface that is not exported:

ERROR: "flush_tlb_kernel_range" [drivers/staging/zsmalloc/zsmalloc.ko] undefined!

Since this is only used as a performance optimization and only on ARM,
we can avoid the problem simply by not using that optimization when
building zsmalloc it is a loadable module.

flush_tlb_kernel_range is often an inline function, but out of the
architectures that use an extern function, only powerpc exports
it.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Seth Jennings <sjenning@...ux.vnet.ibm.com>
Cc: Nitin Gupta <ngupta@...are.org>
---
 drivers/staging/zsmalloc/zsmalloc-main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/zsmalloc/zsmalloc-main.c b/drivers/staging/zsmalloc/zsmalloc-main.c
index e78d262..291c1d8 100644
--- a/drivers/staging/zsmalloc/zsmalloc-main.c
+++ b/drivers/staging/zsmalloc/zsmalloc-main.c
@@ -225,7 +225,7 @@ struct zs_pool {
  * so that USE_PGTABLE_MAPPING is defined. This causes zsmalloc to use
  * page table mapping rather than copying for object mapping.
 */
-#if defined(CONFIG_ARM)
+#if defined(CONFIG_ARM) && !defined(MODULE)
 #define USE_PGTABLE_MAPPING
 #endif
 
-- 
1.8.1.2

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