[PATCH v3 14/28] arm64/sve: Backend logic for setting the vector length

[Catalin Marinas]

On Tue, Oct 10, 2017 at 07:38:31PM +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 at arm.com>
> Cc: Alex Bennée <alex.bennee at linaro.org>

Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>