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We don't need to update linux page table entry with _PAGE_HASHPTE early
in hash pte fault. A parallel pte update will loop via _PAGE_BUSY
and look at _PAGE_HASHPTE for a required hpte flush only if
_PAGE_BUSY is cleared. That ensures a pte update will wait for a
parallel hpte insert to finish before looking at _PAGE_HASHPTE bit.
To avoid further confusion drop setting _PAGE_HASHPTE in cmpxchg in __hash_page_4K.
commit 41743a4e34f0 ("powerpc: Free a PTE bit on ppc64 with 64K pages")
did similar change for 64K config
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
c367a44133