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Make swapon and swapoff individually selectable.

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For example, without swapoff, code shrinks by 277 bytes.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2016-11-14 17:30:50 +01:00
parent 1924e99ad3
commit f417ffd88f
4 changed files with 50 additions and 32 deletions
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51
util-linux/swaponoff.c
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@ -7,6 +7,47 @@
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config SWAPON
//config: bool "swapon"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: This option enables the 'swapon' utility.
//config: Once you have created some swap space using 'mkswap', you also need
//config: to enable your swap space with the 'swapon' utility. The 'swapoff'
//config: utility is used, typically at system shutdown, to disable any swap
//config: space. If you are not using any swap space, you can leave this
//config: option disabled.
//config:
//config:config FEATURE_SWAPON_DISCARD
//config: bool "Support discard option -d"
//config: default y
//config: depends on SWAPON
//config: help
//config: Enable support for discarding swap area blocks at swapon and/or as
//config: the kernel frees them. This option enables both the -d option on
//config: 'swapon' and the 'discard' option for swap entries in /etc/fstab.
//config:
//config:config FEATURE_SWAPON_PRI
//config: bool "Support priority option -p"
//config: default y
//config: depends on SWAPON
//config: help
//config: Enable support for setting swap device priority in swapon.
//config:
//config:config SWAPOFF
//config: bool "swapoff"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: This option enables the 'swapoff' utility.
//applet:IF_SWAPON(APPLET_ODDNAME(swapon, swap_on_off, BB_DIR_SBIN, BB_SUID_DROP, swapon))
//applet:IF_SWAPOFF(APPLET_ODDNAME(swapoff, swap_on_off, BB_DIR_SBIN, BB_SUID_DROP, swapoff))
//kbuild:lib-$(CONFIG_SWAPON) += swaponoff.o
//kbuild:lib-$(CONFIG_SWAPOFF) += swaponoff.o
//usage:#define swapon_trivial_usage
//usage: "[-a] [-e]" IF_FEATURE_SWAPON_DISCARD(" [-d[POL]]") IF_FEATURE_SWAPON_PRI(" [-p PRI]") " [DEVICE]"
//usage:#define swapon_full_usage "\n\n"
@ -74,7 +115,15 @@ struct globals {
#endif
#define INIT_G() do { setup_common_bufsiz(); } while (0)
#define do_swapoff (applet_name[5] == 'f')
#if ENABLE_SWAPOFF
# if ENABLE_SWAPON
# define do_swapoff (applet_name[5] == 'f')
# else
# define do_swapoff 1
# endif
#else
# define do_swapoff 0
#endif
/* Command line options */
enum {