Re: [RFC][PATCH 01/11] asm-generic/tlb: Provide a comment

[Peter Zijlstra]

On Wed, Sep 19, 2018 at 01:23:29PM +0100, Will Deacon wrote:

> > > > + *    which (when !need_flush_all; fullmm will have start = end = ~0UL) provides
> > > > + *    the range that needs to be flushed to cover the pages to be freed.
> > > 
> > > I don't understand the mention of need_flush_all here -- I didn't think it
> > > was used by the core code at all.
> > 
> > The core does indeed not use that flag; but if the architecture set
> > that, the range is still ignored.
> > 
> > Can you suggest clearer wording?
> 
> The range is only ignored if the default tlb_flush() implementation is used
> though, right? Since this text is about the fields that tlb_flush() can use,
> I think we can just delete the part in brackets.

Well, any architecture that actually uses need_flush_all will obviously
require a tlb_flush implementation that looks at it.

But OK, I'll remove the note.