On Wed, 24 Oct 2012 09:38:57 +0400
Andrey Wagin <ava...@gmail.com> wrote:
> >
> > I think that returning -ENOMEM in response to an excessive nesting
> > attempt is misleading - the system *didn't* run out of memory. EINVAL
> > is better?
>
> I chose ENOMEM by analogy with max_pid. When a new PID can not be
> allocated, ENOMEM is returned too.
I don't know what this means - please be carefully specific when
identifying kernel code.
If you're referring to kernel/pid.c:alloc_pid() then -ENOMEM is
appropriate there, because a failure *is* caused by memory allocation
failure.
But ENOMEM isn't appropriate for nesting-depth-exceeded - we shouldn't
tell the user "you ran out of memory" when he didn't! -EINVAL isn't
really appropriate either ("Invalid argument") but it has become a
general you-screwed-up catchall and seems to me to be the most
appropriate errno we have available.
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