On Thu, Aug 13, 2020 at 10:36:31PM +0100, Matthew Wilcox wrote:
> On Thu, Aug 13, 2020 at 11:55:21PM +0300, Mike Rapoport wrote:
> > +/*
> > + * In the kernel's mapped region we know everything is in region number 5, so
> > + * as an optimisation its PGD already points to the area for that region.
>
> Is it actually an optimisation? Are there any benchmarks where this
> makes any difference whatsoever? Or should the comment be closer to
>
> /* ia64 is gratuitously different. Cope with it. */
It better suits arch/ia64/Kconfig ;-)
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 5b4ec80bf586..205cdb91a6d5 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -62,6 +62,7 @@ config IA64
the 32-bit X86 line. The IA-64 Linux project has a home
page at <http://www.linuxia64.org/> and a mailing list at
<linux-ia64@xxxxxxxxxxxxxxx>.
+ IA-64 is gratuitously different. Cope with it.
> I might suggest that pgd be changed to be the same as every other pgd
> in the system, and every other architecture.
I did some grepping and got lost in IA-64 assembly, so I agree with
Jessica that it would open a can of worms.
--
Sincerely yours,
Mike.
