> Roland, I notice in the 2.6.29 code that:
> 1. There is a function validate_pat_support() that should be called to
> make sure that pat support is available. Should the driver call this
> function?
> (the linux-cross-referencer did not find any callers).
validate_pat_support() was removed in the upstream kernel in 75a04811
("x86: handle PAT more like other CPU features"). So no, the driver
shouldn't call it.
> 2. What happens with non-X86 architectures? The function
> pgprot_writecombine() is defined
> only in X86 archs.
Look at include/asm-generic/pgtable.h:
#ifndef pgprot_writecombine
#define pgprot_writecombine pgprot_noncached
#endif
- R.
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