From 6bfef171d0d74cb050112e0e49feb20bfddf7f42 Mon Sep 17 00:00:00 2001 From: Barry Song Date: Tue, 23 Feb 2021 13:32:30 +1300 Subject: 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/vm/TLB/arch-support.txt | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'Documentation/features/vm') 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 | -- cgit v1.2.3