From 6bfef171d0d74cb050112e0e49feb20bfddf7f42 Mon Sep 17 00:00:00 2001 From: Barry Song Date: Tue, 23 Feb 2021 13:32:30 +1300 Subject: [PATCH] Documentation/features: mark BATCHED_UNMAP_TLB_FLUSH doesn't apply to ARM64 BATCHED_UNMAP_TLB_FLUSH is used on x86 to do batched tlb shootdown by sending one IPI to TLB flush all entries after unmapping pages rather than sending an IPI to flush each individual entry. On arm64, tlb shootdown is done by hardware. Flush instructions are innershareable. The local flushes are limited to the boot (1 per CPU) and when a task is getting a new ASID. So marking this feature as "TODO" is not proper. ".." isn't good as well. So this patch adds a "N/A" for this kind of features which are not needed on some architectures. Signed-off-by: Barry Song Acked-by: Will Deacon Cc: Mel Gorman Cc: Andy Lutomirski Cc: Catalin Marinas Cc: Will Deacon Link: https://lore.kernel.org/r/20210223003230.11976-1-song.bao.hua@hisilicon.com Signed-off-by: Jonathan Corbet --- Documentation/features/arch-support.txt | 1 + Documentation/features/vm/TLB/arch-support.txt | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/Documentation/features/arch-support.txt b/Documentation/features/arch-support.txt index d22a1095e661..118ae031840b 100644 --- a/Documentation/features/arch-support.txt +++ b/Documentation/features/arch-support.txt @@ -8,4 +8,5 @@ The meaning of entries in the tables is: | ok | # feature supported by the architecture |TODO| # feature not yet supported by the architecture | .. | # feature cannot be supported by the hardware + | N/A| # feature doesn't apply to the architecture diff --git a/Documentation/features/vm/TLB/arch-support.txt b/Documentation/features/vm/TLB/arch-support.txt index 48a5ca548399..e1c3a4c4d107 100644 --- a/Documentation/features/vm/TLB/arch-support.txt +++ b/Documentation/features/vm/TLB/arch-support.txt @@ -9,7 +9,7 @@ | alpha: | TODO | | arc: | TODO | | arm: | TODO | - | arm64: | TODO | + | arm64: | N/A | | csky: | TODO | | h8300: | .. | | hexagon: | TODO |