linux-kernel - Re: [PATCH v3] arm64: v8.4: Support for new floating point multiplication instructions

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Message-ID: <20180105112837.ljpfmv5vwxsdlavm@armageddon.cambridge.arm.com>
Date:   Fri, 5 Jan 2018 11:28:37 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     gengdongjiu <gengdongjiu@...wei.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>, mark.rutland@....com,
        linux-doc@...r.kernel.org, corbet@....net,
        Suzuki K Poulose <Suzuki.Poulose@....com>,
        will.deacon@....com, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com, zhihui.gao@...wei.com, huangshaoyu@...wei.com,
        guohanjun@...wei.com, arvind.yadav.cs@...il.com,
        robin.murphy@....com, Dave.Martin@....com,
        linux-arm-kernel@...ts.infradead.org, zhanghaibin7@...wei.com
Subject: Re: [PATCH v3] arm64: v8.4: Support for new floating point
 multiplication instructions

On Fri, Jan 05, 2018 at 04:22:24PM +0800, gengdongjiu wrote:
> On 2018/1/5 15:57, Greg KH wrote:
> > On Fri, Jan 05, 2018 at 09:22:54AM +0800, gengdongjiu wrote:
> >> Hi will/catalin
> >>
> >> On 2017/12/13 18:09, Suzuki K Poulose wrote:
> >>> On 13/12/17 10:13, Dongjiu Geng wrote:
> >>>> ARM v8.4 extensions add new neon instructions for performing a
> >>>> multiplication of each FP16 element of one vector with the corresponding
> >>>> FP16 element of a second vector, and to add or subtract this without an
> >>>> intermediate rounding to the corresponding FP32 element in a third vector.
> >>>>
> >>>> This patch detects this feature and let the userspace know about it via a
> >>>> HWCAP bit and MRS emulation.
> >>>>
> >>>> Cc: Dave Martin <Dave.Martin@....com>
> >>>> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> >>>> Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
> >>>> Reviewed-by: Dave Martin <Dave.Martin@....com>
> >>>
> >>> Looks good to me.
> >>>
> >>> Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
> >>
> >>  sorry to disturb you. Reminder, hope this patch can be applied to Linux 4.15-rc7.
> > 
> > New features should not be going into 4.15-rc, that should be a 4.16-rc1
> > thing, right?
> 
> It is also great if it can be applied to 4.16-rc1. Thanks a lot!

I will queue it for 4.16-rc1.

-- 
Catalin