[PATCH 0/1] ARM: thumb: Fix thumb mode compilation problems.

[dave.martin@linaro.org (Dave Martin)]

On Fri, May 13, 2011 at 12:58:45PM -0700, Vadim Bendebury wrote:
> 
> This patch won't necessarily apply as it has not been verified on
> a real hardware, so this is more of an RFC.
> 
> Vadim Bendebury (1):
>   ARM: thumb: Fix thumb mode compilation problems.
> 
>  arch/arm/kernel/fiq.c         |   34 ++++++++++++++++++++++++++--------
>  arch/arm/mach-tegra/headsmp.S |    3 ++-
>  2 files changed, 28 insertions(+), 9 deletions(-)
> 
> -- 
> 1.7.3.1
> 
> 
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A different patch for this has already been discussed:

http://thread.gmane.org/gmane.linux.ports.arm.kernel/112864

It's a bit stalled on my side because I don't have a suitable platform
to test it on.  As some have suggested, in my case (imx51) the inclusion
of code was inherited from from an older subarch tree and is no longer
appropriate -- so my problem is actually solved just by not building
this code.

If the code is really used in your kernel (not just built) it would
be really useful if you could test this patch.

However you should definitely check whether the code is really used at
all on tegra.

There's a fair chance that it's not used: FIQ is not much used by linux
on armv7 and above: unless you make use of cache+TLB lockdown / SRAM etc.,
FIQ is unlikely to be significantly faster than IRQ on recent CPUs.  FIQ
may also get reserved for use by TrustZone on some platforms, complicating
the picture further. 

Cheers
---Dave