The patch titled
Subject: mm: remove redundant 'default n' from Kconfig-s
has been added to the -mm tree. Its filename is
mm-remove-redundant-default-n-from-kconfig-s.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-remove-redundant-default-n-from-kconfig-s.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-remove-redundant-default-n-from-kconfig-s.patch
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------------------------------------------------------
From: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Subject: mm: remove redundant 'default n' from Kconfig-s
'default n' is the default value for any bool or tristate Kconfig
setting so there is no need to write it explicitly.
Also since commit f467c5640c29 ("kconfig: only write '# CONFIG_FOO
is not set' for visible symbols") the Kconfig behavior is the same
regardless of 'default n' being present or not:
...
One side effect of (and the main motivation for) this change is making
the following two definitions behave exactly the same:
config FOO
bool
config FOO
bool
default n
With this change, neither of these will generate a
'# CONFIG_FOO is not set' line (assuming FOO isn't selected/implied).
That might make it clearer to people that a bare 'default n' is
redundant.
...
Link: http://lkml.kernel.org/r/c3385916-e4d4-37d3-b330-e6b7dff83a52@xxxxxxxxxxx
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/Kconfig | 11 -----------
mm/Kconfig.debug | 1 -
2 files changed, 12 deletions(-)
--- a/mm/Kconfig~mm-remove-redundant-default-n-from-kconfig-s
+++ a/mm/Kconfig
@@ -161,7 +161,6 @@ config MEMORY_HOTPLUG_SPARSE
config MEMORY_HOTPLUG_DEFAULT_ONLINE
bool "Online the newly added memory blocks by default"
- default n
depends on MEMORY_HOTPLUG
help
This option sets the default policy setting for memory hotplug
@@ -439,7 +438,6 @@ config NEED_PER_CPU_KM
config CLEANCACHE
bool "Enable cleancache driver to cache clean pages if tmem is present"
- default n
help
Cleancache can be thought of as a page-granularity victim cache
for clean pages that the kernel's pageframe replacement algorithm
@@ -463,7 +461,6 @@ config CLEANCACHE
config FRONTSWAP
bool "Enable frontswap to cache swap pages if tmem is present"
depends on SWAP
- default n
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
@@ -535,7 +532,6 @@ config ZSWAP
depends on FRONTSWAP && CRYPTO=y
select CRYPTO_LZO
select ZPOOL
- default n
help
A lightweight compressed cache for swap pages. It takes
pages that are in the process of being swapped out and attempts to
@@ -552,14 +548,12 @@ config ZSWAP
config ZPOOL
tristate "Common API for compressed memory storage"
- default n
help
Compressed memory storage API. This allows using either zbud or
zsmalloc.
config ZBUD
tristate "Low (Up to 2x) density storage for compressed pages"
- default n
help
A special purpose allocator for storing compressed pages.
It is designed to store up to two compressed pages per physical
@@ -570,7 +564,6 @@ config ZBUD
config Z3FOLD
tristate "Up to 3x density storage for compressed pages"
depends on ZPOOL
- default n
help
A special purpose allocator for storing compressed pages.
It is designed to store up to three compressed pages per physical
@@ -580,7 +573,6 @@ config Z3FOLD
config ZSMALLOC
tristate "Memory allocator for compressed pages"
depends on MMU
- default n
help
zsmalloc is a slab-based memory allocator designed to store
compressed RAM pages. zsmalloc uses virtual memory mapping
@@ -631,7 +623,6 @@ config MAX_STACK_SIZE_MB
config DEFERRED_STRUCT_PAGE_INIT
bool "Defer initialisation of struct pages to kthreads"
- default n
depends on SPARSEMEM
depends on !NEED_PER_CPU_KM
depends on 64BIT
@@ -743,7 +734,6 @@ config ARCH_HAS_PKEYS
config PERCPU_STATS
bool "Collect percpu memory statistics"
- default n
help
This feature collects and exposes statistics via debugfs. The
information includes global and per chunk statistics, which can
@@ -751,7 +741,6 @@ config PERCPU_STATS
config GUP_BENCHMARK
bool "Enable infrastructure for get_user_pages_fast() benchmarking"
- default n
help
Provides /sys/kernel/debug/gup_benchmark that helps with testing
performance of get_user_pages_fast().
--- a/mm/Kconfig.debug~mm-remove-redundant-default-n-from-kconfig-s
+++ a/mm/Kconfig.debug
@@ -33,7 +33,6 @@ config DEBUG_PAGEALLOC
config DEBUG_PAGEALLOC_ENABLE_DEFAULT
bool "Enable debug page memory allocations by default?"
- default n
depends on DEBUG_PAGEALLOC
---help---
Enable debug page memory allocations by default? This value
_
Patches currently in -mm which might be from b.zolnierkie@xxxxxxxxxxx are
mm-remove-redundant-default-n-from-kconfig-s.patch
