Re: arm: pxa: CPU_PXA27x?

From: Paul Bolle
Date: Fri Nov 21 2014 - 12:09:33 EST

On Fri, 2014-11-21 at 17:48 +0100, Robert Jarzmik wrote:
> Paul Bolle <pebolle@xxxxxxxxxx> writes:
> > Your commit 03ec7fe70c5c ("arm: pxa: add pxa27x device-tree support") is
> > included in today's linux-next (ie, next-20141121). It adds a select
> > statement for CPU_PXA27x. But there's no Kconfig symbol CPU_PXA27x.
> Ah yes, you're perfectly right, CPU_PXA27x was not the one, it was PXA27x, sic
> ..
> >
> > Why is that select needed? For what it's worth: __cpu_is_pxa27x()
> > compiles to something interesting if CONFIG_PXA27x is defined.
> You mean "is not defined", right ?

Perhaps I was ambiguous. This referred to these lines in
#ifdef CONFIG_PXA27x
#define __cpu_is_pxa27x(id) \
({ \
unsigned int _id = (id) >> 4 & 0xfff; \
_id == 0x411; \
#define __cpu_is_pxa27x(id) (0)

But you needed PXA27x anyway, so this seems moot now.

> That (CONFIG_PXA27x) select is needed because without it the arm cpu
> architecture is not selected, ie. CONFIG_CPU_XSCALE is not set. And this in turn
> is needed to choose the basic arm operations like TLB handling, cache handling,
> etc ... You cannot compile a single platform kernel without this.
> As a poor excuse, I hadn't seen this because this resulted from a poor merge
> resolution which brought in both "select PXA27x" and "select CPU_PXA27x".

Stuff happens. Would my patch have been included you might have seen the
warning and this thread wouldn't exist.

> > In I proposed a patch that emits a
> > warning in cases like this. Like _all_ Kconfig related patches I've seen
> > flying by lately it appears to be dropped in /dev/null. What's going on?
> For that one I don't know.

Here I'm dragging you into a discussion about something that's been
bugging me for a while now. Hence the addresses that have nothing to do
with pxa in Cc:.

> Ah, and yes I'll send an update patch to remove the "select CPU_PXA27x", thanks
> for noticing this.


Paul Bolle

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