linux-kernel - Re: [PATCH 6/7] riscv: mm: Always flush a single MM context by ASID

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Message-ID: <20230910-haggler-barrier-421cefb0cc79@spud>
Date:   Sun, 10 Sep 2023 20:46:38 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Alexandre Ghiti <alexghiti@...osinc.com>,
        linux-riscv@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] riscv: mm: Always flush a single MM context by ASID

On Sat, Sep 09, 2023 at 03:16:34PM -0500, Samuel Holland wrote:
> Even if ASIDs are not supported, using the single-ASID variant of the
> sfence.vma instruction preserves TLB entries for global (kernel) pages.
> So it is always most efficient to use the single-ASID code path.
> 
> Signed-off-by: Samuel Holland <samuel@...lland.org>

On nommu:
arch/riscv/include/asm/tlbflush.h:59:69: error: 'mm_context_t' has no member named 'id'
arch/riscv/include/asm/tlbflush.h:61:9: error: implicit declaration of function 'local_flush_tlb_all_asid'; did you mean 'local_flush_tlb_all'? [-Werror=implicit-function-declaration]

Cheers,
Conor.

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