Re: [PATCH] arm64/cpuinfo: Show right CPU architecture information

[乱石]

在 2021/1/19 19:01, Will Deacon 写道:
> On Tue, Jan 19, 2021 at 06:55:10PM +0800, Liguang Zhang wrote:
> > CPU architecture is assigned to be a fixed value, it should be obtained
> > from midr register.
> >
> > Signed-off-by: Liguang Zhang <zhangliguang@xxxxxxxxxxxxxxxxx>
> > ---
> >   arch/arm64/kernel/cpuinfo.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
> > index 77605aec25fe..0bd11e0fe9f2 100644
> > --- a/arch/arm64/kernel/cpuinfo.c
> > +++ b/arch/arm64/kernel/cpuinfo.c
> > @@ -191,7 +191,7 @@ static int c_show(struct seq_file *m, void *v)
> >   
> >   		seq_printf(m, "CPU implementer\t: 0x%02x\n",
> >   			   MIDR_IMPLEMENTOR(midr));
> > -		seq_printf(m, "CPU architecture: 8\n");
> > +		seq_printf(m, "CPU architecture: %d\n", MIDR_ARCHITECTURE(midr));
> Huh? Won't this always return 0xf?

Hi Will,

I'm not sure. My platform return 0xf, but /proc/cpuinfo show 8. Why we 
assign a fixed

value to cpu architecture?

Regards

Liguang Zhang

> Will