linux-kernel - [PATCH] drivers/block: remove redundant 'default n' from Kconfig-s

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Date:   Tue, 9 Oct 2018 16:41:01 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Philipp Reisner <philipp.reisner@...bit.com>,
        Lars Ellenberg <lars.ellenberg@...bit.com>,
        drbd-dev@...ts.linbit.com, Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/block: 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.
    ...

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
---
 drivers/block/Kconfig      |    1 -
 drivers/block/drbd/Kconfig |    1 -
 drivers/block/zram/Kconfig |    2 --
 3 files changed, 4 deletions(-)

Index: b/drivers/block/Kconfig
===================================================================
--- a/drivers/block/Kconfig	2018-09-26 15:54:31.958819766 +0200
+++ b/drivers/block/Kconfig	2018-10-09 16:35:01.327177898 +0200
@@ -461,7 +461,6 @@ config BLK_DEV_RBD
 	select LIBCRC32C
 	select CRYPTO_AES
 	select CRYPTO
-	default n
 	help
 	  Say Y here if you want include the Rados block device, which stripes
 	  a block device over objects stored in the Ceph distributed object
Index: b/drivers/block/drbd/Kconfig
===================================================================
--- a/drivers/block/drbd/Kconfig	2018-09-03 18:11:21.973792264 +0200
+++ b/drivers/block/drbd/Kconfig	2018-10-09 16:35:10.251178122 +0200
@@ -11,7 +11,6 @@ config BLK_DEV_DRBD
 	depends on PROC_FS && INET
 	select LRU_CACHE
 	select LIBCRC32C
-	default n
 	help
 
 	  NOTE: In order to authenticate connections you have to select
Index: b/drivers/block/zram/Kconfig
===================================================================
--- a/drivers/block/zram/Kconfig	2018-09-03 18:11:22.185792260 +0200
+++ b/drivers/block/zram/Kconfig	2018-10-09 16:35:21.667178410 +0200
@@ -3,7 +3,6 @@ config ZRAM
 	tristate "Compressed RAM block device support"
 	depends on BLOCK && SYSFS && ZSMALLOC && CRYPTO
 	select CRYPTO_LZO
-	default n
 	help
 	  Creates virtual block devices called /dev/zramX (X = 0, 1, ...).
 	  Pages written to these disks are compressed and stored in memory
@@ -18,7 +17,6 @@ config ZRAM
 config ZRAM_WRITEBACK
        bool "Write back incompressible page to backing device"
        depends on ZRAM
-       default n
        help
 	 With incompressible page, there is no memory saving to keep it
 	 in memory. Instead, write it out to backing device.