| commit | bfe3911a91047557eb0e620f95a370aee6a248c7 | [log] [tgz] |
|---|---|---|
| author | Chris Wilson <[email protected]> | Fri Feb 05 22:00:12 2021 +0000 |
| committer | Daniel Vetter <[email protected]> | Tue Feb 16 09:59:41 2021 +0100 |
| tree | 6c6ebd4ca25f09ece5d55ce0c186a026b0d37509 | |
| parent | f40ddce88593482919761f74910f42f4b84c004b [diff] |
kcmp: Support selection of SYS_kcmp without CHECKPOINT_RESTORE Userspace has discovered the functionality offered by SYS_kcmp and has started to depend upon it. In particular, Mesa uses SYS_kcmp for os_same_file_description() in order to identify when two fd (e.g. device or dmabuf) point to the same struct file. Since they depend on it for core functionality, lift SYS_kcmp out of the non-default CONFIG_CHECKPOINT_RESTORE into the selectable syscall category. Rasmus Villemoes also pointed out that systemd uses SYS_kcmp to deduplicate the per-service file descriptor store. Note that some distributions such as Ubuntu are already enabling CHECKPOINT_RESTORE in their configs and so, by extension, SYS_kcmp. References: https://gitlab.freedesktop.org/drm/intel/-/issues/3046 Signed-off-by: Chris Wilson <[email protected]> Cc: Kees Cook <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Will Drewry <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Dave Airlie <[email protected]> Cc: Daniel Vetter <[email protected]> Cc: Lucas Stach <[email protected]> Cc: Rasmus Villemoes <[email protected]> Cc: Cyrill Gorcunov <[email protected]> Cc: [email protected] Acked-by: Daniel Vetter <[email protected]> # DRM depends on kcmp Acked-by: Rasmus Villemoes <[email protected]> # systemd uses kcmp Reviewed-by: Cyrill Gorcunov <[email protected]> Reviewed-by: Kees Cook <[email protected]> Acked-by: Thomas Zimmermann <[email protected]> Signed-off-by: Daniel Vetter <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]