linux-kernel - Re: [PATCH 05/17] asm-generic/tlb: Rename HAVE_RCU_TABLE_NO

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Date:   Mon, 16 Dec 2019 18:01:58 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nick Piggin <npiggin@...il.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-arch@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Helge Deller <deller@....de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Paul Burton <paulburton@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Richard Henderson <rth@...ddle.net>,
        Nick Hu <nickhu@...estech.com>,
        Paul Walmsley <paul.walmsley@...ive.com>
Subject: Re: [PATCH 05/17] asm-generic/tlb: Rename HAVE_RCU_TABLE_NO_INVALIDATE

Peter Zijlstra <peterz@...radead.org> writes:

> Towards a more consistent naming scheme.
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  arch/Kconfig              |    3 ++-
>  arch/powerpc/Kconfig      |    2 +-
>  arch/sparc/Kconfig        |    2 +-
>  include/asm-generic/tlb.h |    2 +-
>  mm/mmu_gather.c           |    2 +-
>  5 files changed, 6 insertions(+), 5 deletions(-)
>
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -396,8 +396,9 @@ config HAVE_ARCH_JUMP_LABEL_RELATIVE
>  config MMU_GATHER_RCU_TABLE_FREE
>  	bool
>  
> -config HAVE_RCU_TABLE_NO_INVALIDATE
> +config MMU_GATHER_NO_TABLE_INVALIDATE
>  	bool
> +	depends on MMU_GATHER_RCU_TABLE_FREE


Can we drop this Kernel config option instead use
MMU_GATHER_RCU_TABLE_FREE? IMHO reducing the kernel config related to
mmu_gather can reduce the complexity. 

>  
>  config HAVE_MMU_GATHER_PAGE_SIZE
>  	bool
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -223,7 +223,7 @@ config PPC
>  	select HAVE_PERF_REGS
>  	select HAVE_PERF_USER_STACK_DUMP
>  	select MMU_GATHER_RCU_TABLE_FREE		if SMP
> -	select HAVE_RCU_TABLE_NO_INVALIDATE	if MMU_GATHER_RCU_TABLE_FREE
> +	select MMU_GATHER_NO_TABLE_INVALIDATE	if MMU_GATHER_RCU_TABLE_FREE
>  	select HAVE_MMU_GATHER_PAGE_SIZE
>  	select HAVE_REGS_AND_STACK_ACCESS_API
>  	select HAVE_RELIABLE_STACKTRACE		if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN
> --- a/arch/sparc/Kconfig
> +++ b/arch/sparc/Kconfig
> @@ -65,7 +65,7 @@ config SPARC64
>  	select HAVE_KRETPROBES
>  	select HAVE_KPROBES
>  	select MMU_GATHER_RCU_TABLE_FREE if SMP
> -	select HAVE_RCU_TABLE_NO_INVALIDATE if MMU_GATHER_RCU_TABLE_FREE
> +	select MMU_GATHER_NO_TABLE_INVALIDATE if MMU_GATHER_RCU_TABLE_FREE
>  	select HAVE_MEMBLOCK_NODE_MAP
>  	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
>  	select HAVE_DYNAMIC_FTRACE
> --- a/include/asm-generic/tlb.h
> +++ b/include/asm-generic/tlb.h
> @@ -137,7 +137,7 @@
>   *  When used, an architecture is expected to provide __tlb_remove_table()
>   *  which does the actual freeing of these pages.
>   *
> - *  HAVE_RCU_TABLE_NO_INVALIDATE
> + *  MMU_GATHER_NO_TABLE_INVALIDATE
>   *
>   *  This makes MMU_GATHER_RCU_TABLE_FREE avoid calling tlb_flush_mmu_tlbonly() before
>   *  freeing the page-table pages. This can be avoided if you use
> --- a/mm/mmu_gather.c
> +++ b/mm/mmu_gather.c
> @@ -102,7 +102,7 @@ bool __tlb_remove_page_size(struct mmu_g
>   */
>  static inline void tlb_table_invalidate(struct mmu_gather *tlb)
>  {
> -#ifndef CONFIG_HAVE_RCU_TABLE_NO_INVALIDATE
> +#ifndef CONFIG_MMU_GATHER_NO_TABLE_INVALIDATE
>  	/*
>  	 * Invalidate page-table caches used by hardware walkers. Then we still
>  	 * need to RCU-sched wait while freeing the pages because software