arm64: mte: change ASYNC and SYNC TCF settings into bitfields

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Allow the user program to specify both ASYNC and SYNC TCF modes by
repurposing the existing constants as bitfields. This will allow the
kernel to select one of the modes on behalf of the user program. With
this patch the kernel will always select async mode, but a subsequent
patch will make this configurable.

Link: https://linux-review.googlesource.com/id/Icc5923c85a8ea284588cc399ae74fd19ec291230
Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210727205300.2554659-3-pcc@google.com
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Peter Collingbourne 2021-07-27 13:52:56 -07:00 • committed by Catalin Marinas

parent 638982a03f

commit 433c38f40f

3 changed files with 37 additions and 47 deletions

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3

arch/arm64/include/asm/processor.h

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70

arch/arm64/kernel/mte.c

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11

include/uapi/linux/prctl.h

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