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Map linear memory space with 512k and 8M pages whenever
possible.
Three mappings are performed:
- One for kernel text
- One for RO data
- One for the rest
Separating the mappings is done to be able to update the
protection later when using STRICT_KERNEL_RWX.
The ITLB miss handler now need to also handle huge TLBs
unless kernel text in pinned.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c44f0ab5510474f25123d904cd1f4e5c6aa3c1ac.1589866984.git.christophe.leroy@csgroup.eu
cf209951fa