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Martin Schwidefsky authored
With the removal of the dynamic reallocation of page tables for KVM (see git commit 0b46e0a3) the page table allocation / freeing code can be simplified. The page table free code can now use the alloc_pgste bit in the mm context to decide if a page table is 2K or 4K, there is no mix of different sized page tables anymore. This eliminates the need to use "page->_mapcount == 0" to check for 4K page table. Use the lower two bits in page->_mapcount to indicate which 2K fragments of the 4K page are in use. As 31-bit support is gone, remove the two defines ALLOC_ORDER and FRAG_MASK and use the constants directly where appropriate. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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