Re: [PATCH net-next 1/4] arm64: barrier: add DGH macros to control memory accesses merging
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2021-07-30 09:39:30
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On Fri, Jul 30, 2021 at 11:14:21AM +0800, Guangbin Huang wrote:
quoted hunk ↗ jump to hunk
From: Xiongfeng Wang <redacted> 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 <redacted> Signed-off-by: Cheng Jian <redacted> Signed-off-by: Yufeng Mo <redacted> --- 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel