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Jonathan Marek d8a719059b Revert "mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge" 
This reverts commit c742199a01.

c742199a01 ("mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge")
breaks arm64 in at least two ways for configurations where PUD or PMD
folding occur:

  1. We no longer install huge-vmap mappings and silently fall back to
     page-granular entries, despite being able to install block entries
     at what is effectively the PGD level.

  2. If the linear map is backed with block mappings, these will now
     silently fail to be created in alloc_init_pud(), causing a panic
     early during boot.

The pgtable selftests caught this, although a fix has not been
forthcoming and Christophe is AWOL at the moment, so just revert the
change for now to get a working -rc3 on which we can queue patches for
5.15.

A simple revert breaks the build for 32-bit PowerPC 8xx machines, which
rely on the default function definitions when the corresponding
page-table levels are folded, since commit a6a8f7c4aa ("powerpc/8xx:
add support for huge pages on VMAP and VMALLOC"), eg:

  powerpc64-linux-ld: mm/vmalloc.o: in function `vunmap_pud_range':
  linux/mm/vmalloc.c:362: undefined reference to `pud_clear_huge'

To avoid that, add stubs for pud_clear_huge() and pmd_clear_huge() in
arch/powerpc/mm/nohash/8xx.c as suggested by Christophe.

Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: c742199a01 ("mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge")
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Marc Zyngier <maz@kernel.org>
[mpe: Fold in 8xx.c changes from Christophe and mention in change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/linux-arm-kernel/CAMuHMdXShORDox-xxaeUfDW3wx2PeggFSqhVSHVZNKCGK-y_vQ@mail.gmail.com/
Link: https://lore.kernel.org/r/20210717160118.9855-1-jonathan@marek.ca
Link: https://lore.kernel.org/r/87r1fs1762.fsf@mpe.ellerman.id.au
Signed-off-by: Will Deacon <will@kernel.org>
 		2021-07-21 11:28:09 +01:00
..
pat mm: rename pud_page_vaddr to pud_pgtable and make it return pmd_t * 2021-07-08 11:48:22 -07:00
Makefile
…
amdtopology.c
…
cpu_entry_area.c
…
debug_pagetables.c
…
dump_pagetables.c
…
extable.c x86/fpu: Mask PKRU from kernel XRSTOR[S] operations 2021-06-23 19:47:35 +02:00
fault.c Fixes and improvements for FPU handling on x86: 2021-07-07 11:12:01 -07:00
highmem_32.c
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hugetlbpage.c
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ident_map.c
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init.c The x86 MM changes in this cycle were: 2021-04-29 11:41:43 -07:00
init_32.c mm: replace CONFIG_NEED_MULTIPLE_NODES with CONFIG_NUMA 2021-06-29 10:53:55 -07:00
init_64.c mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t * 2021-07-08 11:48:22 -07:00
iomap_32.c
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ioremap.c x86/ioremap: Map EFI-reserved memory as encrypted for SEV 2021-06-08 16:26:55 +02:00
kasan_init_64.c
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kaslr.c x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
kmmio.c x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
maccess.c
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mem_encrypt.c ARM: 2021-05-01 10:14:08 -07:00
mem_encrypt_boot.S x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
mem_encrypt_identity.c x86/sev: Check SME/SEV support in CPUID first 2021-06-04 18:39:09 +02:00
mm_internal.h
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mmap.c
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mmio-mod.c
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numa.c x86/mm: Avoid truncating memblocks for SGX memory 2021-06-18 19:37:01 +02:00
numa_32.c
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numa_64.c
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numa_emulation.c
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numa_internal.h
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pf_in.c
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pf_in.h
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pgtable.c Revert "mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge" 2021-07-21 11:28:09 +01:00
pgtable_32.c
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physaddr.c
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physaddr.h
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pkeys.c Fixes and improvements for FPU handling on x86: 2021-07-07 11:12:01 -07:00
pti.c x86/process/64: Move cpu_current_top_of_stack out of TSS 2021-03-28 22:40:10 +02:00
setup_nx.c
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srat.c
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testmmiotrace.c
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tlb.c perf/x86: Reset the dirty counter to prevent the leak for an RDPMC task 2021-06-17 14:11:47 +02:00