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SubjectRe: [PATCH net-next 1/4] arm64: barrier: add DGH macros to control memory accesses merging
On Fri, Jul 30, 2021 at 11:14:21AM +0800, Guangbin Huang wrote:
> From: Xiongfeng Wang <wangxiongfeng2@huawei.com>
>
> DGH prohibits merging memory accesses with Normal-NC or Device-GRE
> attributes before the hint instruction with any memory accesses
> appearing after the hint instruction. Provide macros to expose it to the
> arch code.
>
> Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
> Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>
> Signed-off-by: Yufeng Mo <moyufeng@huawei.com>
> ---
> arch/arm64/include/asm/assembler.h | 7 +++++++
> arch/arm64/include/asm/barrier.h | 1 +
> 2 files changed, 8 insertions(+)
>
> diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
> index 89faca0e740d..5a3348b5e9f3 100644
> --- a/arch/arm64/include/asm/assembler.h
> +++ b/arch/arm64/include/asm/assembler.h
> @@ -90,6 +90,13 @@
> .endm
>
> /*
> + * Data gathering hint
> + */
> + .macro dgh
> + hint #6
> + .endm

Do we need this macro? It doesn't seem to be used anywhere.

--
Catalin

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