linux-kernel - [PATCH v1 00/30] Modernise VDSO setup

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Date:   Sun, 27 Sep 2020 09:16:16 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v1 00/30] Modernise VDSO setup

This series modernises the setup of VDSO:
- Switch to using _install_special_mapping() which has replaced install_special_mapping()
- Move datapage in front of text like most other architectures to simplify its localisation
- Perform link time symbol resolution instead of runtime

This leads to a huge size reduction of vdso.c

Replaces the two following series:
 [v1,1/9] powerpc/vdso: Remove BUG_ON() in vdso_init()
 [v2,1/5] powerpc/vdso: Remove DBG()

This series is based on top of the series to the C generic VDSO.
It is functionnaly independant but some trivial merge conflict
occurs in some files. I may rebase it on top of merge if the
C generic VDSO series cannot be merged soon.

Christophe Leroy (30):
  powerpc/vdso: Stripped VDSO is not needed, don't build it
  powerpc/vdso: Add missing includes and clean vdso_setup_syscall_map()
  powerpc/vdso: Rename syscall_map_32/64 to simplify
    vdso_setup_syscall_map()
  powerpc/vdso: Remove get_page() in vdso_pagelist initialization
  powerpc/vdso: Remove NULL termination element in vdso_pagelist
  powerpc/vdso: Refactor 32 bits and 64 bits pages setup
  powerpc/vdso: Remove unnecessary ifdefs in vdso_pagelist
    initialization
  powerpc/vdso: Use VDSO size in arch_setup_additional_pages()
  powerpc/vdso: Simplify arch_setup_additional_pages() exit
  powerpc/vdso: Move to _install_special_mapping() and remove
    arch_vma_name()
  powerpc/vdso: Provide vdso_remap()
  powerpc/vdso: Replace vdso_base by vdso
  powerpc/vdso: Move vdso datapage up front
  powerpc/vdso: Simplify __get_datapage()
  powerpc/vdso: Remove unused \tmp param in __get_datapage()
  powerpc/vdso: Retrieve sigtramp offsets at buildtime
  powerpc/vdso: Use builtin symbols to locate fixup section
  powerpc/vdso: Merge __kernel_sync_dicache_p5() into
    __kernel_sync_dicache()
  powerpc/vdso: Remove vdso32_pages and vdso64_pages
  powerpc/vdso: Remove __kernel_datapage_offset
  powerpc/vdso: Remove runtime generated sigtramp offsets
  powerpc/vdso: Remove vdso_patches[] and associated functions
  powerpc/vdso: Remove unused text member in struct lib32/64_elfinfo
  powerpc/vdso: Remove symbol section information in struct
    lib32/64_elfinfo
  powerpc/vdso: Remove lib32_elfinfo and lib64_elfinfo
  powerpc/vdso: Remove vdso_setup()
  powerpc/vdso: Remove vdso_ready
  powerpc/vdso: Remove DBG()
  powerpc/vdso: Remove VDSO32_LBASE and VDSO64_LBASE
  powerpc/vdso: Cleanup vdso.h

 arch/powerpc/Makefile                         |  24 +-
 arch/powerpc/include/asm/book3s/32/mmu-hash.h |   2 +-
 arch/powerpc/include/asm/book3s/64/mmu.h      |   2 +-
 arch/powerpc/include/asm/elf.h                |   2 +-
 arch/powerpc/include/asm/mm-arch-hooks.h      |  25 -
 arch/powerpc/include/asm/mmu_context.h        |   6 +-
 arch/powerpc/include/asm/nohash/32/mmu-40x.h  |   2 +-
 arch/powerpc/include/asm/nohash/32/mmu-44x.h  |   2 +-
 arch/powerpc/include/asm/nohash/32/mmu-8xx.h  |   2 +-
 arch/powerpc/include/asm/nohash/mmu-book3e.h  |   2 +-
 arch/powerpc/include/asm/vdso.h               |  29 +-
 arch/powerpc/include/asm/vdso/gettimeofday.h  |   4 +-
 arch/powerpc/include/asm/vdso_datapage.h      |  17 +-
 arch/powerpc/kernel/asm-offsets.c             |   6 +-
 arch/powerpc/kernel/signal_32.c               |   8 +-
 arch/powerpc/kernel/signal_64.c               |   4 +-
 arch/powerpc/kernel/vdso.c                    | 682 +++---------------
 arch/powerpc/kernel/vdso32/Makefile           |  27 +-
 arch/powerpc/kernel/vdso32/cacheflush.S       |  19 +-
 arch/powerpc/kernel/vdso32/datapage.S         |   7 +-
 .../powerpc/kernel/vdso32/gen_vdso_offsets.sh |  16 +
 arch/powerpc/kernel/vdso32/vdso32.lds.S       |  24 +-
 arch/powerpc/kernel/vdso64/Makefile           |  25 +-
 arch/powerpc/kernel/vdso64/cacheflush.S       |  18 +-
 arch/powerpc/kernel/vdso64/datapage.S         |   7 +-
 .../powerpc/kernel/vdso64/gen_vdso_offsets.sh |  16 +
 arch/powerpc/kernel/vdso64/vdso64.lds.S       |  23 +-
 arch/powerpc/perf/callchain_32.c              |   8 +-
 arch/powerpc/perf/callchain_64.c              |   4 +-
 29 files changed, 267 insertions(+), 746 deletions(-)
 delete mode 100644 arch/powerpc/include/asm/mm-arch-hooks.h
 create mode 100755 arch/powerpc/kernel/vdso32/gen_vdso_offsets.sh
 create mode 100755 arch/powerpc/kernel/vdso64/gen_vdso_offsets.sh

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2.25.0