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linux/arch/powerpc/mm/nohash
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Christophe Leroy a2227a2777 powerpc/32: Don't populate page tables for block mapped pages except on the 8xx. 
Commit d2f15e0979 ("powerpc/32: always populate page tables for
Abatron BDI.") wrongly sets page tables for any PPC32 for using BDI,
and does't update them after init (remove RX on init section, set
text and rodata read-only)

Only the 8xx requires page tables to be populated for using the BDI.
They also need to be populated in order to see the mappings in
/sys/kernel/debug/kernel_page_tables

On BOOK3S_32, pages that are not mapped by page tables are mapped
by BATs. The BDI knows BATs and they can be viewed in
/sys/kernel/debug/powerpc/block_address_translation

Only set pagetables for RAM and IMMR on the 8xx and properly update
them at the end of init.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c8610942203e0d93fcb02ad20c57edd3adb4c9d3.1566554029.git.christophe.leroy@c-s.fr
2019-11-18 22:27:52 +11:00
..
8xx.c powerpc/32: Don't populate page tables for block mapped pages except on the 8xx. 2019-11-18 22:27:52 +11:00
40x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
44x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
book3e_hugetlbpage.c powerpc/mm: move FSL_BOOK3 version of update_mmu_cache() 2019-08-20 21:22:14 +10:00
book3e_pgtable.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
fsl_booke.c powerpc/fsl_booke/kaslr: clear the original kernel if randomized 2019-11-13 19:27:44 +11:00
kaslr_booke.c powerpc/fsl_booke/kaslr: support nokaslr cmdline parameter 2019-11-13 19:27:47 +11:00
Makefile powerpc/fsl_booke/32: implement KASLR infrastructure 2019-11-13 19:27:40 +11:00
mmu_context.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
tlb_low_64e.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
tlb_low.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
tlb.c powerpc/mm: make ioremap_bot common to all 2019-08-27 13:03:34 +10:00