On 08/22/2014 11:31 PM, Lennart Sorensen wrote:
> Any idea how to fix ipipe to not cause a linking error when LPAE is enabled
> on arm?
>
> I see the function __ipipe_pin_range_globally is inside an ifdef block that
> says essentially:
>
> #if !IPIPE
> define __ipipe_pin_range_globally as do nothing
> #else
> #if !LPAE
> define __ipipe_pin_range_globally function
> #endif
> #endif
>
> So if IPIPE and LPAE are both true, then the function is never defined.
>
> This is in arch/arm/mm/fault.c
>
I do not believe this is intentional. That being said, the Linux code in
the #ifdef is not reassuring: exception handlers are not registered when
the kernel is compiled with LPAE, which could mean that exceptions are
used for LPAE when compiled with LPAE. If this is the case, then LPAE
should not be enabled, otherwise your applications will not stay in
primary mode when these faults happen. How much RAM do you have, can you
really test LPAE ?
--
Gilles.
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