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package/systemd: enable tmpfs kernel option

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systemd automatically creates tmpfs mounts for /tmp, /run, /dev/shm, and
others. If tmpfs is not enabled in the kernel, systemd crashes with an
unknown filesystem error on boot. This hasn't manifested itself during
tests with defconfigs such as pc_x86_64_efi_defconfig for a few reasons:

  - No defconfig uses systemd as the init system by default
  - Even if a user does use pc_x86_64_efi_defconfig and changes to systemd,
    the board/pc/linux.config file enables CONFIG_PCI, which selects
    CONFIG_TMPFS.
  - The systemd init tests use a prebuilt kernel with tmpfs enabled.

Enable tmpfs unconditionally to ensure that systemd always boots, even with
a minimal kernel built.

Signed-off-by: Adam Duskett <adam.duskett@amarulasolutions.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit b19976abc90c9712e807726f207ad3d447d876dd)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Adam Duskett 2025-02-26 10:01:08 +01:00 committed by Peter Korsgaard
parent ac7632af83
commit 5746e5aa3c
1 changed files with 1 additions and 0 deletions
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package/systemd/systemd.mk
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@ -852,6 +852,7 @@ SYSTEMD_CONF_ENV = $(HOST_UTF8_LOCALE_ENV)
SYSTEMD_NINJA_ENV = $(HOST_UTF8_LOCALE_ENV)
define SYSTEMD_LINUX_CONFIG_FIXUPS
$(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS)
$(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS)
$(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS)
$(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER)