Re: [PATCH v4 20/28] arm64/sve: Add prctl controls for userspace vector length management

2017-10-30 Thread Dave Martin
On Mon, Oct 30, 2017 at 04:12:13PM +, Alex Bennée wrote: > > Dave Martin writes: > > > On Fri, Oct 27, 2017 at 06:52:50PM +0100, Alex Bennée wrote: > >> > >> Dave Martin writes: > >> > >> > This patch adds two arm64-specific prctls, to permit

Re: [PATCH v4 20/28] arm64/sve: Add prctl controls for userspace vector length management

2017-10-30 Thread Alex Bennée
Dave Martin writes: > On Fri, Oct 27, 2017 at 06:52:50PM +0100, Alex Bennée wrote: >> >> Dave Martin writes: >> >> > This patch adds two arm64-specific prctls, to permit userspace to >> > control its vector length: >> > >> > * PR_SVE_SET_VL: set the

Re: [PATCH v4 20/28] arm64/sve: Add prctl controls for userspace vector length management

2017-10-28 Thread Dave Martin
On Fri, Oct 27, 2017 at 06:52:50PM +0100, Alex Bennée wrote: > > Dave Martin writes: > > > This patch adds two arm64-specific prctls, to permit userspace to > > control its vector length: > > > > * PR_SVE_SET_VL: set the thread's SVE vector length and vector > >length

Re: [PATCH v4 20/28] arm64/sve: Add prctl controls for userspace vector length management

2017-10-27 Thread Alex Bennée
Dave Martin writes: > This patch adds two arm64-specific prctls, to permit userspace to > control its vector length: > > * PR_SVE_SET_VL: set the thread's SVE vector length and vector >length inheritance mode. > > * PR_SVE_GET_VL: get the same information. > >

[PATCH v4 20/28] arm64/sve: Add prctl controls for userspace vector length management

2017-10-27 Thread Dave Martin
This patch adds two arm64-specific prctls, to permit userspace to control its vector length: * PR_SVE_SET_VL: set the thread's SVE vector length and vector length inheritance mode. * PR_SVE_GET_VL: get the same information. Although these prctls resemble instruction set features in the SVE