On Tue, Jun 12, 2018 at 12:16 AM Nicholas Piggin <npiggin@xxxxxxxxx> wrote:
>
> This brings the number of tlbiel instructions required by a kernel
> compile from 33M to 25M, most avoided from exec->shift_arg_pages.
And this shows that "page_start/end" is purely for powerpc and used
nowhere else.
The previous patch should have been to purely powerpc page table
walking and not touch asm-generic/tlb.h
I think you should make those changes to
arch/powerpc/include/asm/tlb.h. If that means you can't use the
generic header, then so be it.
Or maybe you can embed the generic case in some ppc-specific
structures, and use 90% of the generic code just with your added
wrappers for that radix invalidation on top.
But don't make other architectures do pointless work that doesn't
matter - or make sense - for them.
Linus
