Re: [PATCH v9 2/3] arm64: Define Documentation/arm64/tagged-address-abi.rst

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On Wed, Aug 21, 2019 at 05:47:29PM +0100, Catalin Marinas wrote:
> From: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
> 
> On AArch64 the TCR_EL1.TBI0 bit is set by default, allowing userspace
> (EL0) to perform memory accesses through 64-bit pointers with a non-zero
> top byte. Introduce the document describing the relaxation of the
> syscall ABI that allows userspace to pass certain tagged pointers to
> kernel syscalls.
> 
> Cc: Will Deacon <will.deacon@xxxxxxx>
> Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
> Cc: Szabolcs Nagy <szabolcs.nagy@xxxxxxx>
> Cc: Kevin Brodsky <kevin.brodsky@xxxxxxx>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
> Co-developed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> ---
>  Documentation/arm64/tagged-address-abi.rst | 156 +++++++++++++++++++++
>  1 file changed, 156 insertions(+)
>  create mode 100644 Documentation/arm64/tagged-address-abi.rst

Thanks, I'll pick this on up.

Will



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