Re: [PATCH v2 14/28] arm64/sve: Backend logic for setting the vector length

Catalin Marinas
2017-09-13T17:29:18Z

On Thu, Aug 31, 2017 at 06:00:46PM +0100, Dave P Martin wrote:
> This patch implements the core logic for changing a task's vector
> length on request from userspace. This will be used by the ptrace
> and prctl frontends that are implemented in later patches.
>
> The SVE architecture permits, but does not require, implementations
> to support vector lengths that are not a power of two. To handle
> this, logic is added to check a requested vector length against a
> possibly sparse bitmap of available vector lengths at runtime, so
> that the best supported value can be chosen.
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> Cc: Alex BennÃ©e <alex.bennee@linaro.org>

Can this be merged with patch 20? It seems to add the PR_ definitions
which get actually used later when the prctl interface is added.

--
Catalin