[PATCH v2] hvc_dcc : add support to armv4 and armv5 core

Le Tue, 25 Sep 2012 15:44:57 +0000,
Arnd Bergmann [off-list ref] a ?crit :

It's not possible to build a kernel that runs on ARMv5 (or below) and
also on ARMv6 (or above), so the effect would be exactly the same.
While we are putting a lot of effort into making all sorts of ARMv6
and ARMv7 based systems work with the same kernel binary, it's highly
unlikely we would ever need the above to be runtime selected, because
there are a lot of other differences at assembly level.

I know but Alan was not happy with the static version with ifdef [1]
[2]. That why a dynamic version was done.


Matthieu


[1]

quoted

There are no plans to ever make it possible; there are too many
significant differences between ARMv4, v5 architectures and
ARMv6,v7 architectures to warrant making this runtime selectable.  

Then bury this crap in platform files please not in the drivers/tty
layer code. Make it a platform driver provided callback or something.

Alan

[2]

quoted

I posted a new v2 patch that make the selection dynamic.  

Thanks - fine with that one - or with burying it in headers etc in
the arm subdirs.