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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 f467c5640c ("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@samsung.com
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2019-05-13 17:21:53 -07:00 committed by Linus Torvalds
parent 8c7829b04c
commit 62afcd1cb8
2 changed files with 0 additions and 12 deletions
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11
mm/Kconfig
View File

@ -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().

1
mm/Kconfig.debug
View File

@ -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