linux-kernel - [PATCH 13/13] mm: hide the FRONTSWAP Kconfig symbol

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Date:   Fri, 24 Dec 2021 07:22:46 +0100
From:   Christoph Hellwig <hch@....de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     Hugh Dickins <hughd@...gle.com>,
        Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Vitaly Wool <vitaly.wool@...sulko.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org
Subject: [PATCH 13/13] mm: hide the FRONTSWAP Kconfig symbol

Select FRONTSWAP from ZSWAP instead of prompting for it.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 mm/Kconfig | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 430240289b02b..3326ee3903f33 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -445,20 +445,7 @@ config HAVE_SETUP_PER_CPU_AREA
 	bool
 
 config FRONTSWAP
-	bool "Enable frontswap to cache swap pages if tmem is present"
-	depends on SWAP
-	help
-	  Frontswap is so named because it can be thought of as the opposite
-	  of a "backing" store for a swap device.  The data is stored into
-	  "transcendent memory", memory that is not directly accessible or
-	  addressable by the kernel and is of unknown and possibly
-	  time-varying size.  When space in transcendent memory is available,
-	  a significant swap I/O reduction may be achieved.  When none is
-	  available, all frontswap calls are reduced to a single pointer-
-	  compare-against-NULL resulting in a negligible performance hit
-	  and swap data is stored as normal on the matching swap device.
-
-	  If unsure, say Y to enable frontswap.
+	bool
 
 config CMA
 	bool "Contiguous Memory Allocator"
@@ -523,7 +510,8 @@ config MEM_SOFT_DIRTY
 
 config ZSWAP
 	bool "Compressed cache for swap pages (EXPERIMENTAL)"
-	depends on FRONTSWAP && CRYPTO=y
+	depends on SWAP && CRYPTO=y
+	select FRONTSWAP
 	select ZPOOL
 	help
 	  A lightweight compressed cache for swap pages.  It takes
-- 
2.30.2