Yu Watanabe
553e366086
Previously, mount_private_sysfs() was implemented by using open_tree() and move_mount() to keep submounts. But these syscalls are slightly new and supported since kernel version 5.2. We already do the same thing for /proc/, but without the new syscalls. Let's use the same logic to mount private procfs. Then, we can mount new instance of sysfs with older kernels.
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