Re: [PATCH 01/24] kobject: return actual error on kset_create_and_add

[James Bottomley]

On Tue, 2014-06-17 at 11:00 -0500, Christoph Lameter wrote:
> On Tue, 17 Jun 2014, Greg KH wrote:
> 
> > Who really cares about that?  What can do you do with that additional
> > information that will help anything out?
> 
> The obvious reason for doing so is so that one can put the error code into
> a log message to get more detailed information on why the call failed.
> 
> In this particular case the slab allocator can give an error message that
> gives a hint why the sysfs support could not be enabled.

What useful information does this supply?  The current assumption on
NULL return is -ENOMEM ... what's the interesting case where this
assumption is wrong?

James


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