On Wed, Aug 27, 2008 at 8:12 PM, Roland Dreier <[EMAIL PROTECTED]> wrote:
> OK, please try this and let me know if it helps:
>
> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
> index 1c93c25..98d7bf9 100644
> --- a/arch/powerpc/mm/mem.c
> +++ b/arch/powerpc/mm/mem.c
> @@ -75,11 +75,10 @@ static inline pte_t *virt_to_kpte(unsigned long vaddr)
>
> int page_is_ram(unsigned long pfn)
> {
> - unsigned long paddr = (pfn << PAGE_SHIFT);
> -
> #ifndef CONFIG_PPC64 /* XXX for now */
> - return paddr < __pa(high_memory);
> + return pfn < max_pfn;
> #else
> + unsigned long paddr = (pfn << PAGE_SHIFT);
> int i;
> for (i=0; i < lmb.memory.cnt; i++) {
> unsigned long base;
>
Ronald, thank you for the hint, I actually tried something slightly different:
return pfn < (__pa(high_memory) >> PAGE_SHIFT);
and it worked. I guess your fix is faster, I'll try it tomorrow.
I also checked that the problem is there in the top of the tree in
Linus' git - isn't it amazing - I guess very few people use mmap()
nowadays, everybody must be using UIO device :-)
cheers,
vadim
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