+ mm-hide-the-frontswap-kconfig-symbol.patch added to -mm tree

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The patch titled
     Subject: mm: hide the FRONTSWAP Kconfig symbol
has been added to the -mm tree.  Its filename is
     mm-hide-the-frontswap-kconfig-symbol.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-hide-the-frontswap-kconfig-symbol.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-hide-the-frontswap-kconfig-symbol.patch

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------------------------------------------------------
From: Christoph Hellwig <hch@xxxxxx>
Subject: mm: hide the FRONTSWAP Kconfig symbol

Select FRONTSWAP from ZSWAP instead of prompting for it.

Link: https://lkml.kernel.org/r/20211224062246.1258487-14-hch@xxxxxx
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Cc: Dan Streetman <ddstreet@xxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <Konrad.wilk@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Seth Jennings <sjenning@xxxxxxxxxx>
Cc: Vitaly Wool <vitaly.wool@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/Kconfig |   18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

--- a/mm/Kconfig~mm-hide-the-frontswap-kconfig-symbol
+++ a/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
_

Patches currently in -mm which might be from hch@xxxxxx are

mm-remove-cleancache.patch
frontswap-remove-frontswap_writethrough.patch
frontswap-remove-frontswap_tmem_exclusive_gets.patch
frontswap-remove-frontswap_shrink.patch
frontswap-remove-frontswap_curr_pages.patch
frontswap-simplify-frontswap_init.patch
frontswap-remove-the-frontswap-exports.patch
mm-simplify-try_to_unuse.patch
frontswap-remove-frontswap_test.patch
frontswap-simplify-frontswap_register_ops.patch
mm-mark-swap_lock-and-swap_active_head-static.patch
frontswap-remove-support-for-multiple-ops.patch
mm-hide-the-frontswap-kconfig-symbol.patch




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