On 10/07/2020 10.30, Cyrill Gorcunov wrote: > On Fri, Jul 10, 2020 at 09:56:31AM +0200, Rasmus Villemoes wrote: >> The ability to check open file descriptions for equality (without >> resorting to unreliable fstat() and fcntl(F_GETFL) comparisons) can be >> useful outside of the checkpoint/restore use case - for example, >> systemd uses kcmp() to deduplicate the per-service file descriptor >> store. >> >> Make it possible to have the kcmp() syscall without the full >> CONFIG_CHECKPOINT_RESTORE. >> >> Signed-off-by: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx> >> --- >> I deliberately drop the ifdef in the eventpoll.h header rather than >> replace with KCMP_SYSCALL; it's harmless to declare a function that >> isn't defined anywhere. > > Could you please point why setting #fidef KCMP_SYSCALL in eventpoll.h > is not suitable? It's just from a general "avoid ifdef clutter if possible" POV. The conditional declaration of the function doesn't really serve any purpose. > Still the overall idea is fine for me, thanks!> > Reviewed-by: Cyrill Gorcunov <gorcunov@xxxxxxxxx> Thank you. Rasmus
