linux-kernel - [PATCH v2 00/14] introduce generic pte_{alloc,free}_one[

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Date:   Wed,  8 May 2019 09:16:57 +0300
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greentime Hu <green.hu@...il.com>,
        Guan Xuetao <gxt@....edu.cn>, Guo Ren <guoren@...nel.org>,
        Helge Deller <deller@....de>, Ley Foon Tan <lftan@...era.com>,
        Matthew Wilcox <willy@...radead.org>,
        Matt Turner <mattst88@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Burton <paul.burton@...s.com>,
        Richard Kuo <rkuo@...eaurora.org>,
        Richard Weinberger <richard@....at>,
        Russell King <linux@...linux.org.uk>,
        Sam Creasey <sammy@...my.net>, x86@...nel.org,
        linux-alpha@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-hexagon@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
        linux-mm@...ck.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-um@...ts.infradead.org, nios2-dev@...ts.rocketboards.org,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: [PATCH v2 00/14] introduce generic pte_{alloc,free}_one[_kernel]

Hi,

Many architectures have similar, if not identical implementation of
pte_alloc_one_kernel(), pte_alloc_one(), pte_free_kernel() and pte_free().

A while ago Anshuman suggested to introduce a common definition of
GFP_PGTABLE and during the discussion it was suggested to rather
consolidate the allocators.

These patches introduce generic version of PTE allocation and free and
enable their use on several architectures.

The conversion introduces some changes for some of the architectures.
Here's the executive summary and the details are described at each patch.

* Most architectures do not set __GFP_ACCOUNT for the user page tables.
Switch to the generic functions is "spreading that goodness to all other
architectures"
* arm, arm64 and unicore32 used to check if the pte is not NULL before
freeing its memory in pte_free_kernel(). It's dropped during the
conversion as it seems superfluous.
* x86 used to BUG_ON() is pte was not page aligned duirng
pte_free_kernel(), the generic version simply frees the memory without any
checks.

This set only performs the straightforward conversion, the architectures
with different logic in pte_alloc_one() and pte_alloc_one_kernel() are not
touched, as well as architectures that have custom page table allocators.

v2 changes:
* rebase on the current upstream
* fix copy-paste error in the description of pte_free()
* fix changelog for MIPS to match actual changes
* drop powerpc changes
* add Acked/Reviewed tags

[1] https://lore.kernel.org/lkml/1547619692-7946-1-git-send-email-anshuman.khandual@arm.com

Mike Rapoport (14):
  asm-generic, x86: introduce generic pte_{alloc,free}_one[_kernel]
  alpha: switch to generic version of pte allocation
  arm: switch to generic version of pte allocation
  arm64: switch to generic version of pte allocation
  csky: switch to generic version of pte allocation
  hexagon: switch to generic version of pte allocation
  m68k: sun3: switch to generic version of pte allocation
  mips: switch to generic version of pte allocation
  nds32: switch to generic version of pte allocation
  nios2: switch to generic version of pte allocation
  parisc: switch to generic version of pte allocation
  riscv: switch to generic version of pte allocation
  um: switch to generic version of pte allocation
  unicore32: switch to generic version of pte allocation

 arch/alpha/include/asm/pgalloc.h     |  40 +------------
 arch/arm/include/asm/pgalloc.h       |  41 +++++---------
 arch/arm/mm/mmu.c                    |   2 +-
 arch/arm64/include/asm/pgalloc.h     |  47 +++------------
 arch/arm64/mm/mmu.c                  |   2 +-
 arch/arm64/mm/pgd.c                  |   9 ++-
 arch/csky/include/asm/pgalloc.h      |  30 +---------
 arch/hexagon/include/asm/pgalloc.h   |  34 +----------
 arch/m68k/include/asm/sun3_pgalloc.h |  41 +-------------
 arch/mips/include/asm/pgalloc.h      |  33 +----------
 arch/nds32/include/asm/pgalloc.h     |  31 ++--------
 arch/nios2/include/asm/pgalloc.h     |  37 +-----------
 arch/parisc/include/asm/pgalloc.h    |  33 +----------
 arch/riscv/include/asm/pgalloc.h     |  29 +---------
 arch/um/include/asm/pgalloc.h        |  16 +-----
 arch/um/kernel/mem.c                 |  22 -------
 arch/unicore32/include/asm/pgalloc.h |  36 +++---------
 arch/x86/include/asm/pgalloc.h       |  19 +------
 arch/x86/mm/pgtable.c                |  33 +++--------
 include/asm-generic/pgalloc.h        | 107 +++++++++++++++++++++++++++++++++--
 virt/kvm/arm/mmu.c                   |   2 +-
 21 files changed, 178 insertions(+), 466 deletions(-)

-- 
2.7.4