Excerpts from Thomas Bogendoerfer's message of February 4, 2021 8:34 pm:

On Thu, Feb 04, 2021 at 01:29:26PM +1000, Nicholas Piggin wrote:

quoted

Excerpts from Huang Pei's message of February 4, 2021 11:39 am:

quoted

MIPS page fault path(except huge page) takes 3 exceptions (1 TLB Miss
+ 2 TLB Invalid), butthe second TLB Invalid exception is just
triggered by __update_tlb from do_page_fault writing tlb without
_PAGE_VALID set. With this patch, user space mapping prot is made
young by default (with both _PAGE_VALID and _PAGE_YOUNG set),
and it only take 1 TLB Miss + 1 TLB Invalid exception

Remove pte_sw_mkyoung without polluting MM code and make page fault
delay of MIPS on par with other architecture

Signed-off-by: Huang Pei <redacted>

Could we merge this? For the core code,

sure, but IMHO I should only merge the MIPS part, correct ?

You could ack it for MIPS and Andrew could take it through his tree 
would avoid dependencies.

Thanks,
Nick