linux-kernel - [PATCH v2 0/6] remove tlb_remove_page

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Message-Id: <cover.1740454179.git.zhengqi.arch@bytedance.com>
Date: Tue, 25 Feb 2025 11:45:50 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: peterz@...radead.org,
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	Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH v2 0/6] remove tlb_remove_page_ptdesc()

Changes in v2:
 - add [PATCH v2 2/6] (Peter Zijlstra)
 - remove [PATCH 4/5] and add [PATCH v2 5/6]
 - rebase onto the next-20250224

Hi all,

As suggested by Peter Zijlstra below [1], this series aims to remove
tlb_remove_page_ptdesc().

: Fundamentally tlb_remove_page() is about removing *pages* as from a PTE,
: there should not be a page-table anywhere near here *ever*.
:
: Yes, some architectures use tlb_remove_page() for page-tables too, but
: that is more or less an implementation detail that can be fixed.

After this series, all architectures use tlb_remove_table() or tlb_remove_ptdesc()
to remove the page table pages. In the future, once all architectures using
tlb_remove_table() have also converted to using struct ptdesc (eg. powerpc), it
may be possible to use only tlb_remove_ptdesc().

This series is based on next-20250224.

Comments and suggestions are welcome!

Thanks,
Qi

[1]. https://lore.kernel.org/linux-mm/20250103111457.GC22934@noisy.programming.kicks-ass.net/

Qi Zheng (6):
  mm: pgtable: make generic tlb_remove_table() use struct ptdesc
  mm: pgtable: change pt parameter of tlb_remove_ptdesc() to struct
    ptdesc *
  mm: pgtable: convert some architectures to use tlb_remove_ptdesc()
  riscv: pgtable: unconditionally use tlb_remove_ptdesc()
  x86: pgtable: convert to use tlb_remove_ptdesc()
  mm: pgtable: remove tlb_remove_page_ptdesc()

 arch/csky/include/asm/pgalloc.h      |  3 +--
 arch/hexagon/include/asm/pgalloc.h   |  3 +--
 arch/loongarch/include/asm/pgalloc.h |  3 +--
 arch/m68k/include/asm/sun3_pgalloc.h |  3 +--
 arch/mips/include/asm/pgalloc.h      |  3 +--
 arch/nios2/include/asm/pgalloc.h     |  9 ++++-----
 arch/openrisc/include/asm/pgalloc.h  |  3 +--
 arch/riscv/include/asm/pgalloc.h     | 26 ++++----------------------
 arch/sh/include/asm/pgalloc.h        |  3 +--
 arch/um/include/asm/pgalloc.h        |  9 +++------
 arch/x86/mm/pgtable.c                |  8 ++++----
 include/asm-generic/tlb.h            | 14 ++++----------
 12 files changed, 26 insertions(+), 61 deletions(-)

-- 
2.20.1