Make swapon and swapoff individually selectable.

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

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

4 files changed, 50 insertions, 32 deletions

diff --git a/include/applets.src.h b/include/applets.src.h
index dbc45953c..f2c754b74 100644
--- a/include/applets.src.h
+++ b/include/applets.src.h
@@ -287,8 +287,6 @@ IF_STAT(APPLET(stat, BB_DIR_BIN, BB_SUID_DROP))
 IF_STRINGS(APPLET(strings, BB_DIR_USR_BIN, BB_SUID_DROP))
 IF_STTY(APPLET(stty, BB_DIR_BIN, BB_SUID_DROP))
 IF_SUM(APPLET(sum, BB_DIR_USR_BIN, BB_SUID_DROP))
-IF_SWAPONOFF(APPLET_ODDNAME(swapoff, swap_on_off, BB_DIR_SBIN, BB_SUID_DROP, swapoff))
-IF_SWAPONOFF(APPLET_ODDNAME(swapon, swap_on_off, BB_DIR_SBIN, BB_SUID_DROP, swapon))
 IF_SWITCH_ROOT(APPLET(switch_root, BB_DIR_SBIN, BB_SUID_DROP))
 IF_BB_SYSCTL(APPLET(sysctl, BB_DIR_SBIN, BB_SUID_DROP))
 IF_TAC(APPLET_NOEXEC(tac, tac, BB_DIR_USR_BIN, BB_SUID_DROP, tac))
diff --git a/util-linux/Config.src b/util-linux/Config.src
index 922cabdb8..ee0d8a632 100644
--- a/util-linux/Config.src
+++ b/util-linux/Config.src
@@ -489,34 +489,6 @@ config SCRIPTREPLAY
           This program replays a typescript, using timing information
           given by script -t.
 
-config SWAPONOFF
-        bool "swaponoff"
-        default y
-        select PLATFORM_LINUX
-        help
-          This option enables both the 'swapon' and the 'swapoff' utilities.
-          Once you have created some swap space using 'mkswap', you also need
-          to enable your swap space with the 'swapon' utility. The 'swapoff'
-          utility is used, typically at system shutdown, to disable any swap
-          space. If you are not using any swap space, you can leave this
-          option disabled.
-
-config FEATURE_SWAPON_DISCARD
-        bool "Support discard option -d"
-        default y
-        depends on SWAPONOFF
-        help
-          Enable support for discarding swap area blocks at swapon and/or as
-          the kernel frees them. This option enables both the -d option on
-          'swapon' and the 'discard' option for swap entries in /etc/fstab.
-
-config FEATURE_SWAPON_PRI
-        bool "Support priority option -p"
-        default y
-        depends on SWAPONOFF
-        help
-          Enable support for setting swap device priority in swapon.
-
 config SWITCH_ROOT
         bool "switch_root"
         default y
diff --git a/util-linux/Kbuild.src b/util-linux/Kbuild.src
index 0b87c52ac..5ee5cf7ff 100644
--- a/util-linux/Kbuild.src
+++ b/util-linux/Kbuild.src
@@ -40,6 +40,5 @@ lib-$(CONFIG_READPROFILE)       += readprofile.o
 lib-$(CONFIG_RTCWAKE)           += rtcwake.o
 lib-$(CONFIG_SCRIPT)            += script.o
 lib-$(CONFIG_SCRIPTREPLAY)      += scriptreplay.o
-lib-$(CONFIG_SWAPONOFF)         += swaponoff.o
 lib-$(CONFIG_SWITCH_ROOT)       += switch_root.o
 lib-$(CONFIG_UMOUNT)            += umount.o
diff --git a/util-linux/swaponoff.c b/util-linux/swaponoff.c
index 6713852e5..0a2d23f50 100644
--- a/util-linux/swaponoff.c
+++ b/util-linux/swaponoff.c
@@ -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 {