[PATCH v12 4/39] mman: Add map_shadow_stack() flags

[Yury Khrustalev]

On Thu, Aug 29, 2024 at 12:27:20AM +0100, Mark Brown wrote:
> In preparation for adding arm64 GCS support make the map_shadow_stack()
> SHADOW_STACK_SET_TOKEN flag generic and add _SET_MARKER. The existing
> flag indicates that a token usable for stack switch should be added to
> the top of the newly mapped GCS region while the new flag indicates that
> a top of stack marker suitable for use by unwinders should be added
> above that.
> 
> For arm64 the top of stack marker is all bits 0.
> 
> Reviewed-by: Thiago Jung Bauermann <thiago.bauermann at linaro.org>
> Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>
> Signed-off-by: Mark Brown <broonie at kernel.org>

Acked-by: Yury Khrustalev <yury.khrustalev at arm.com>