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busybox: add an inittab entry to activate swap

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There is a call to swapoff in the shutdown sequence, so call "swapon -a"
on startup. As stated in the swapon man page,

   All devices marked as "swap" in /etc/fstab are made available, except
   for those with the "noauto" option. Devices that are already being
   used as swap are silently skipped.

So even if the system has some init script to start/stop swap (e.g. from
a rootfs ovelay) calling swapon/swapoff would be harmless.

Signed-off-by: Carlos Santos <casantos@datacom.com.br>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Carlos Santos 2018-06-11 03:00:15 -03:00 committed by Peter Korsgaard
parent d2a091c96b
commit d524cc7d9d
1 changed files with 1 additions and 0 deletions
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package/busybox/inittab
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@ -18,6 +18,7 @@
::sysinit:/bin/mount -o remount,rw /
::sysinit:/bin/mkdir -p /dev/pts /dev/shm
::sysinit:/bin/mount -a
::sysinit:/sbin/swapon -a
null::sysinit:/bin/ln -sf /proc/self/fd /dev/fd
null::sysinit:/bin/ln -sf /proc/self/fd/0 /dev/stdin
null::sysinit:/bin/ln -sf /proc/self/fd/1 /dev/stdout