MIPS: make userspace mapping young by default

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

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Huang Pei <[email protected]>
Reviewed-by: Nicholas Piggin <[email protected]>
Acked-by: <[email protected]>
Acked-by: Thomas Bogendoerfer <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: <[email protected]>
Cc: Bibo Mao <[email protected]>
Cc: Jiaxun Yang <[email protected]>
Cc: Paul Burton <[email protected]>
Cc: Li Xuefeng <[email protected]>
Cc: Yang Tiezhu <[email protected]>
Cc: Gao Juxin <[email protected]>
Cc: Fuxin Zhang <[email protected]>
Cc: Huacai Chen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions