Re: [PATCH] powerpc/32s: Don't flush all TLBs when flushing one page

[Christophe Leroy]

Le 31/01/2020 Ã 16:51, Segher Boessenkool a ÃcritÂ:
> On Fri, Jan 31, 2020 at 03:37:34PM +0000, Christophe Leroy wrote:
> > When the range is a single page, do a page flush instead.
>
> > +	start &= PAGE_MASK;
> > +	end = (end - 1) | ~PAGE_MASK;
> >   	if (!Hash) {
> > -		_tlbia();
> > +		if (end - start == PAGE_SIZE)
> > +			_tlbie(start);
> > +		else
> > +			_tlbia();
> >   		return;
> >   	}
>
> For just one page, you get  end - start == 0  actually?

Oops, good catch.

Indeed you don't get PAGE_SIZE but (PAGE_SIZE - 1) for just one page.

Christophe