arm64: mm: Allocate ASIDs in pairs

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Commit 0c8ea531b7 upstream.

In preparation for separate kernel/user ASIDs, allocate them in pairs
for each mm_struct. The bottom bit distinguishes the two: if it is set,
then the ASID will map only userspace.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Will Deacon 2017-08-10 14:10:28 +01:00 • committed by Greg Kroah-Hartman

parent 00ff7de671

commit a8bad38cff

2 changed files with 18 additions and 8 deletions

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1

arch/arm64/include/asm/mmu.h

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25

arch/arm64/mm/context.c

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