-ker...@lists.infradead.org;
> linux-kernel@vger.kernel.org; linux...@kvack.org; Punit Agrawal
> ; Anshuman Khandual
> ; Jun Yao ;
> Alex Van Brunt ; Robin Murphy
> ; Thomas Gleixner ;
> Andrew Morton ; Jérôme Glisse
> ; Ralph Campbell ;
> hejia...@gmail.com; Kaly Xin (Arm Tec
On Wed, Sep 18, 2019 at 07:20:17AM -0700, Matthew Wilcox wrote:
> On Wed, Sep 18, 2019 at 09:19:12PM +0800, Jia He wrote:
> > +/* Decouple AF from AFDBM. */
> > +bool cpu_has_hw_af(void)
> > +{
> > + return (read_cpuid(ID_AA64MMFR1_EL1) & 0xf);
> > +}
> > +
>
> Do you really want to call
On Wed, Sep 18, 2019 at 03:20:41PM +0100, Suzuki K Poulose wrote:
> On 18/09/2019 14:19, Jia He wrote:
> > diff --git a/arch/arm64/include/asm/cpufeature.h
> > b/arch/arm64/include/asm/cpufeature.h
> > index c96ffa4722d3..206b6e3954cf 100644
> > --- a/arch/arm64/include/asm/cpufeature.h
> > +++
Hi Jia,
On 18/09/2019 14:19, Jia He wrote:
We unconditionally set the HW_AFDBM capability and only enable it on
CPUs which really have the feature. But sometimes we need to know
whether this cpu has the capability of HW AF. So decouple AF from
DBM by new helper cpu_has_hw_af().
Signed-off-by:
On Wed, Sep 18, 2019 at 09:19:12PM +0800, Jia He wrote:
> +/* Decouple AF from AFDBM. */
> +bool cpu_has_hw_af(void)
> +{
> + return (read_cpuid(ID_AA64MMFR1_EL1) & 0xf);
> +}
> +
Do you really want to call read_cpuid() every time? I would have thought
you'd want to use the static branch
We unconditionally set the HW_AFDBM capability and only enable it on
CPUs which really have the feature. But sometimes we need to know
whether this cpu has the capability of HW AF. So decouple AF from
DBM by new helper cpu_has_hw_af().
Signed-off-by: Jia He
Suggested-by: Suzuki Poulose
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