linux.git/arch/arm64/include/asm/kernel-pgtable.h, branch v5.14

arm64/mm: Rename ARM64_SWAPPER_USES_SECTION_MAPS

2021-06-21T17:22:23+00:00

ARM64_SWAPPER_USES_SECTION_MAPS implies that a PMD level huge page mappings
are used for swapper, idmap and vmemmap. Lets make it PMD explicit removing
any possible confusion with generic memory sections and also bit generic as
it's applicable for idmap and vmemmap mappings as well. Hence rename it as
ARM64_KERNEL_USES_PMD_MAPS instead.

Cc: Catalin Marinas 
Cc: Will Deacon 
Cc: Mark Rutland 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual 
Acked-by: Catalin Marinas 
Link: https://lore.kernel.org/r/1623991622-24294-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Will Deacon

arm64/mm: Drop SECTION_[SHIFT|SIZE|MASK]

2021-06-15T11:08:39+00:00

SECTION_[SHIFT|SIZE|MASK] are essentially PMD_[SHIFT|SIZE|MASK]. But these
create confusion being similar to generic sparsemem memory sections, which
are derived from SECTION_SIZE_BITS. Section references have always implied
PMD level block mapping. Instead just use all PMD level macros which would
make it explicit and also remove confusion with sparsmem memory sections.

Cc: Catalin Marinas 
Cc: Will Deacon 
Cc: Mark Rutland 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual 
Reviewed-by: Gavin Shan 
Acked-by: Catalin Marinas 
Link: https://lore.kernel.org/r/1623658706-7182-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Will Deacon

arm64/mm: Use CONT_PMD_SHIFT for ARM64_MEMSTART_SHIFT

2021-06-15T11:08:25+00:00

ARM64_MEMSTART_SIZE needs to be aligned with CONT_PMD_SIZE on 16K page size
config. Hence just directly use CONT_PMD_SHIFT.

Cc: Catalin Marinas 
Cc: Will Deacon 
Cc: Mark Rutland 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual 
Reviewed-by: Gavin Shan 
Acked-by: Catalin Marinas 
Link: https://lore.kernel.org/r/1623663755-8949-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Will Deacon

arm64/mm: Drop SWAPPER_INIT_MAP_SIZE

2021-06-15T11:08:11+00:00

The commit cdef5f6e9e0e ("arm64: mm: allocate pagetables anywhere") had
dropped the last reference to SWAPPER_INIT_MAP_SIZE. Hence just clean up.

Cc: Catalin Marinas 
Cc: Will Deacon 
Cc: Mark Rutland 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual 
Reviewed-by: Gavin Shan 
Link: https://lore.kernel.org/r/1623665411-20055-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Will Deacon

arm64: Force SPARSEMEM_VMEMMAP as the only memory management model

2021-04-23T13:18:21+00:00

Currently arm64 allows a choice of FLATMEM, SPARSEMEM and
SPARSEMEM_VMEMMAP. However, only the latter is tested regularly. FLATMEM
does not seem to boot in certain configurations (guest under KVM with
Qemu as a VMM). Since the reduction of the SECTION_SIZE_BITS to 27 (4K
pages) or 29 (64K page), there's little argument against the memory
wasted by the mem_map array with SPARSEMEM.

Make SPARSEMEM_VMEMMAP the only available option, non-selectable, and
remove the corresponding #ifdefs under arch/arm64/.

Signed-off-by: Catalin Marinas 
Cc: Will Deacon 
Acked-by: Will Deacon 
Acked-by: Ard Biesheuvel 
Acked-by: Marc Zyngier 
Reviewed-by: Anshuman Khandual 
Acked-by: Mike Rapoport 
Link: https://lore.kernel.org/r/20210420093559.23168-1-catalin.marinas@arm.com
Signed-off-by: Catalin Marinas

arm64: consistently use reserved_pg_dir

2020-11-10T17:30:40+00:00

Depending on configuration options and specific code paths, we either
use the empty_zero_page or the configuration-dependent reserved_ttbr0
as a reserved value for TTBR{0,1}_EL1.

To simplify this code, let's always allocate and use the same
reserved_pg_dir, replacing reserved_ttbr0. Note that this is allocated
(and hence pre-zeroed), and is also marked as read-only in the kernel
Image mapping.

Keeping this separate from the empty_zero_page potentially helps with
robustness as the empty_zero_page is used in a number of cases where a
failure to map it read-only could allow it to become corrupted.

The (presently unused) swapper_pg_end symbol is also removed, and
comments are added wherever we rely on the offsets between the
pre-allocated pg_dirs to keep these cases easily identifiable.

Signed-off-by: Mark Rutland 
Cc: Will Deacon 
Link: https://lore.kernel.org/r/20201103102229.8542-1-mark.rutland@arm.com
Signed-off-by: Catalin Marinas

arm64: get rid of TEXT_OFFSET

2020-09-07T14:00:52+00:00

TEXT_OFFSET serves no purpose, and for this reason, it was redefined
as 0x0 in the v5.8 timeframe. Since this does not appear to have caused
any issues that require us to revisit that decision, let's get rid of the
macro entirely, along with any references to it.

Signed-off-by: Ard Biesheuvel 
Link: https://lore.kernel.org/r/20200825135440.11288-1-ardb@kernel.org
Signed-off-by: Will Deacon

arm64: Reduce the number of header files pulled into vmlinux.lds.S

2020-07-21T09:50:37+00:00

Although vmlinux.lds.S smells like an assembly file and is compiled
with __ASSEMBLY__ defined, it's actually just fed to the preprocessor to
create our linker script. This means that any assembly macros defined
by headers that it includes will result in a helpful link error:

| aarch64-linux-gnu-ld:./arch/arm64/kernel/vmlinux.lds:1: syntax error

In preparation for an arm64-private asm/rwonce.h implementation, which
will end up pulling assembly macros into linux/compiler.h, reduce the
number of headers we include directly and transitively in vmlinux.lds.S

Acked-by: Peter Zijlstra (Intel) 
Signed-off-by: Will Deacon

mm: introduce include/linux/pgtable.h

2020-06-09T16:39:13+00:00

The include/linux/pgtable.h is going to be the home of generic page table
manipulation functions.

Start with moving asm-generic/pgtable.h to include/linux/pgtable.h and
make the latter include asm/pgtable.h.

Signed-off-by: Mike Rapoport 
Signed-off-by: Andrew Morton 
Cc: Arnd Bergmann 
Cc: Borislav Petkov 
Cc: Brian Cain 
Cc: Catalin Marinas 
Cc: Chris Zankel 
Cc: "David S. Miller" 
Cc: Geert Uytterhoeven 
Cc: Greentime Hu 
Cc: Greg Ungerer 
Cc: Guan Xuetao 
Cc: Guo Ren 
Cc: Heiko Carstens 
Cc: Helge Deller 
Cc: Ingo Molnar 
Cc: Ley Foon Tan 
Cc: Mark Salter 
Cc: Matthew Wilcox 
Cc: Matt Turner 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Michal Simek 
Cc: Nick Hu 
Cc: Paul Walmsley 
Cc: Richard Weinberger 
Cc: Rich Felker 
Cc: Russell King 
Cc: Stafford Horne 
Cc: Thomas Bogendoerfer 
Cc: Thomas Gleixner 
Cc: Tony Luck 
Cc: Vincent Chen 
Cc: Vineet Gupta 
Cc: Will Deacon 
Cc: Yoshinori Sato 
Link: http://lkml.kernel.org/r/20200514170327.31389-3-rppt@kernel.org
Signed-off-by: Linus Torvalds

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234

2019-06-19T15:09:07+00:00

Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation this program is
  distributed in the hope that it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program if not see http www gnu org
  licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 503 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Alexios Zavras 
Reviewed-by: Allison Randal 
Reviewed-by: Enrico Weigelt 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de
Signed-off-by: Greg Kroah-Hartman