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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 <song.bao.hua@hisilicon.com> Acked-by: Will Deacon <will@kernel.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20210223003230.11976-1-song.bao.hua@hisilicon.com Signed-off-by: Jonathan Corbet <corbet@lwn.net>
13 lines
452 B
Plaintext
13 lines
452 B
Plaintext
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For generic kernel features that need architecture support, the
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arch-support.txt file in each feature directory shows the arch
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support matrix, for all upstream Linux architectures.
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The meaning of entries in the tables is:
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| ok | # feature supported by the architecture
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|TODO| # feature not yet supported by the architecture
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| .. | # feature cannot be supported by the hardware
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| N/A| # feature doesn't apply to the architecture
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