Re: [PATCH 02/12] mm: enable MMU_GATHER_RCU_TABLE_FREE for most 2-level architectures

[sashiko-bot@kernel.org]

> Commit e3ecf7c7d082 ("mm: pgtable: convert some architectures to use
> tlb_remove_ptdesc()") updated a number of architectures from using
> pagetable_dtor() + tlb_remove_page_ptdesc() to using tlb_remove_ptdesc() in
> __pte_free_tlb().
> 
> This is meaningful as tlb_remove_ptdesc() allows for RCU page table
> freeing if CONFIG_MMU_GATHER_RCU_TABLE_FREE is specified.
> 
> The csky, hexagon, nios2, openrisc, sh (except X2) and m68k-sun3
> architectures all have 2 levels of page tables, so the only page tables
> ever freed by mmu_gather are PTEs, so this update suffices to ensure that
> every page table freed by the mmu_gather mechanism is freed under RCU.
> 
> Therefore, update all of these architectures to select
> CONFIG_MMU_GATHER_RCU_TABLE_FREE.
> 
> This forms part of an overall effort to switch every architecture to this
> mode.
> 
> Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260901-rcu-pagetable-freeing-v1-0-5456a81c8212@kernel.org?part=2