linux-kernel - [PATCH 03/11] frontswap: Remove the check for frontswap

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Message-Id: <1360959635-18922-4-git-send-email-konrad.wilk@oracle.com>
Date:	Fri, 15 Feb 2013 15:20:27 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	dan.magenheimer@...cle.com, sjenning@...ux.vnet.ibm.com,
	gregkh@...uxfoundation.org, akpm@...ux-foundation.org,
	ngupta@...are.org, rcj@...ux.vnet.ibm.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	minchan@...nel.org
Cc:	ric.masonn@...il.com, lliubbo@...il.com,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH 03/11] frontswap: Remove the check for frontswap_enabled.

With the support for loading of backends as modules (see for example:
"staging: zcache: enable zcache to be built/loaded as a module"), the
frontswap_enabled is always set to true ("mm: frontswap: lazy
initialization to allow tmem backends to build/run as modules").

The next patch "frontswap: Use static_key instead of frontswap_enabled and
frontswap_ops" is are going to convert the frontswap_enabled to be a bit more
selective and be on/off depending on whether the backend has registered - and
not whether the frontswap API is enabled.

The two functions: frontswap_init and frontswap_invalidate_area
can be called anytime - they queue up which of the swap devices are
active and can use the frontswap API - once the backend is loaded.

As such there is no need to check for 'frontswap_enabled' at all.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
 include/linux/frontswap.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/include/linux/frontswap.h b/include/linux/frontswap.h
index d4f2987..140323b 100644
--- a/include/linux/frontswap.h
+++ b/include/linux/frontswap.h
@@ -116,14 +116,12 @@ static inline void frontswap_invalidate_page(unsigned type, pgoff_t offset)

 static inline void frontswap_invalidate_area(unsigned type)
 {
-	if (frontswap_enabled)
-		__frontswap_invalidate_area(type);
+	__frontswap_invalidate_area(type);
 }

 static inline void frontswap_init(unsigned type)
 {
-	if (frontswap_enabled)
-		__frontswap_init(type);
+	__frontswap_init(type);
 }

 #endif /* _LINUX_FRONTSWAP_H */
-- 
1.8.0.2

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