Daniel Phillips wrote:
> Your patch preserves a linear relationship between physical and virtual
> memory, because you do both the ptov and vtop lookup in the same array. As
> such, you don't provide the functionality I provide of being able to fit a
> large amount of physical memory into a small amount of virtual memory, and
> you can't join all your separate pgdat's into one, as I do.
Read the source again. arch/m68k/mm/motorola.c:map_chunk() maps all
memory areas into single virtual area (virtaddr is static there and only
increased starting from PAGE_OFFSET). In paging_init() there is only a
single call to free_area_init().
> and replace the four direct table lookup with loops.
The loops are only an implementation detail and can be replaced with
> you've accidently
> repeated the last four lines of mm_vtop. Finally, it looks like your
> ZTWO_VADDR hack in mm_ptov would also cease to be a special case, at least,
That stuff is obsolete since ages, it should be replaced with BUG().
> You do have a config option, it's CONFIG_SINGLE_MEMORY_CHUNK.
That was our cheap answer to avoid the loops.
> You just didn't
> attempt to create the contiguous logical address space as I did, so you
> didn't need to go outside your arch.
I don't need that, because I create a contiguous _virtual_ address
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