Hi Mickaël,

On 4/18/23 22:50, Mickaël Salaün wrote:
> Indeed, ENOTSUPP is a kernel error type, only EOPNOTSUPP should be used 
> to return error to user space. ENOTSUPP is not used by the kernel, it is 
> only defined by the libc:
> 
> # ifndef ENOTSUP
> #  define ENOTSUP		EOPNOTSUPP
> # endif
> 
> 

[...]

> 
> ENOTSUP doesn't exist in the kernel source, so it is legitimate that 
> Landlock and any other kernel interfaces use EOPNOTSUPP.  ENOTSUP should 
> then not replace EOPNOTSUPP for Landlock nor any other kernel interfaces.

That sounds reasonable.  It's a bit confusing that many man pages document
ENOTSUP (user-space).  I'll take this into account for when I see some
patch that touches one of those ENOTSUPs, and ask why, and maybe remove
them all in favor of EOPNOTSUPP.

Thanks,
Alex

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