[PATCH] Documentation/features: mark BATCHED_UNMAP_TLB_FLUSH doesn't apply to ARM64

[Jonathan Corbet]

Barry Song <song.bao.hua at hisilicon.com> writes:

> 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.
>
> Cc: Mel Gorman <mgorman at suse.de>
> Cc: Andy Lutomirski <luto at kernel.org>
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Will Deacon <will at kernel.org>
> Signed-off-by: Barry Song <song.bao.hua at hisilicon.com>
> ---
>  Documentation/features/arch-support.txt        | 1 +
>  Documentation/features/vm/TLB/arch-support.txt | 2 +-
>  2 files changed, 2 insertions(+), 1 deletion(-)

This had a conflict with the c6x removal, but I fixed that up and
(finally) applied it, thanks.

jon