[Buildroot] [git commit branch/2018.02.x] sysvinit: add an inittab entry to activate swap

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=5456704d4f7684a8d231e7195dd0baa18ab16896
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2018.02.x

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 at datacom.com.br>
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
(cherry picked from commit d2a091c96b87c5674754a12ee9055a164270d0eb)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/sysvinit/inittab | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/package/sysvinit/inittab b/package/sysvinit/inittab
index 2ca253ad6c..a31471031f 100644
--- a/package/sysvinit/inittab
+++ b/package/sysvinit/inittab
@@ -7,7 +7,8 @@ id:3:initdefault:
 si0::sysinit:/bin/mount -t proc proc /proc
 si1::sysinit:/bin/mount -o remount,rw /
 si2::sysinit:/bin/mkdir -p /dev/pts /dev/shm
-si4::sysinit:/bin/mount -a
+si3::sysinit:/bin/mount -a
+si4::sysinit:/sbin/swapon -a
 si5::sysinit:/bin/ln -sf /proc/self/fd /dev/fd 2>/dev/null
 si6::sysinit:/bin/ln -sf /proc/self/fd/0 /dev/stdin 2>/dev/null
 si7::sysinit:/bin/ln -sf /proc/self/fd/1 /dev/stdout 2>/dev/null