Re: [PATCH 01/35] lmb: prepare x86 to use lmb to replace early_res

From: Benjamin Herrenschmidt
Date: Mon May 17 2010 - 18:04:49 EST

On Mon, 2010-05-17 at 11:03 -0700, H. Peter Anvin wrote:
> On 05/14/2010 01:09 AM, Benjamin Herrenschmidt wrote:
> >
> > No. That is not the point. Read the rest of my email !
> >
> > We need to -sanitize- those errors. _Maybe_ exposing LMB_ERROR is the
> > right way to do so, but in that case, we need to make -all- function use
> > the same error code. Right now, some fail with 0 and some with
> >
> Using errnos like the rest of the kernel seems like the right thing to
> do, IMO.

Maybe. The allocator/find functions return a physical address. If we all
agree that a physical address between -PAGE_SIZE and 0 is never valid,
then we can overlay the negative errno codes like we do for pointers.

I'll have a look at that, it shouldn't be very hard.


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