2bba2ffbe0
Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on 32bit and 64bit. On 64bit, let's use MSB 56 (LSB 7), located right next to the page type. On 32bit, let's use LSB 2 to avoid stealing one bit from the swap offset. There seems to be no real reason why these bits cannot be used for swap PTEs. The important part is that _PAGE_PRESENT and _PAGE_HASHPTE remain 0. While at it, mask the type in __swp_entry() and remove _PAGE_BIT_SWAP_TYPE from pte-e500.h: while it was used in 64bit code it was ignored in 32bit code. Link: https://lkml.kernel.org/r/20230113171026.582290-19-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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| .. | ||
| hugetlb-8xx.h | ||
| kup-8xx.h | ||
| mmu-8xx.h | ||
| mmu-40x.h | ||
| mmu-44x.h | ||
| pgalloc.h | ||
| pgtable.h | ||
| pte-8xx.h | ||
| pte-40x.h | ||
| pte-44x.h | ||
| pte-85xx.h | ||