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* [lkp] [+454 bytes kernel size regression] [i386-tinyconfig] [5b31ca6562] fs: allow to tuck mounts explicitly
@ 2023-03-26 10:32 kernel test robot
  0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2023-03-26 10:32 UTC (permalink / raw)
  To: Christian Brauner, Christian Brauner; +Cc: Josh Triplett, lkp, oe-kbuild-all


FYI, we noticed a +454 bytes kernel size regression due to commit:

commit: 5b31ca65629e53f06bb0edf43d31fe5723d91ccd (fs: allow to tuck mounts explicitly)
https://git.kernel.org/cgit/linux/kernel/git/vfs/idmapping.git b4/fs-tucked-mounts


Details as below (size data is obtained by `nm --size-sort vmlinux`):

d13cc7e2: fs: use a for loop when locking a mount
5b31ca65: fs: allow to tuck mounts explicitly

+----------------------------+----------+----------+-------+
|           symbol           | d13cc7e2 | 5b31ca65 | delta |
+----------------------------+----------+----------+-------+
| bzImage                    | 501536   | 501824   | 288   |
| nm.t.do_move_mount         | 464      | 647      | 183   |
| nm.t.lock_mount_mountpoint | 0        | 152      | 152   |
| nm.t.attach_recursive_mnt  | 454      | 572      | 118   |
| nm.t.mnt_tuck_mountpoint   | 0        | 69       | 69    |
| nm.t.can_umount            | 0        | 44       | 44    |
| nm.T.__ia32_sys_move_mount | 180      | 219      | 39    |
| nm.T.path_mount            | 1092     | 1094     | 2     |
| nm.T.path_umount           | 83       | 59       | -24   |
| nm.t.lock_mount            | 136      | 7        | -129  |
+----------------------------+----------+----------+-------+



Thanks


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