Re: [PATCH] mm: Generalize and rename notify_page_fault() as kprobe_page_fault()
From: Vineet Gupta
Date: Tue Jun 18 2019 - 12:01:47 EST
+CC Masami San, Eugeniy
On 6/13/19 10:57 AM, Vineet Gupta wrote:
> On 6/13/19 3:07 AM, Anshuman Khandual wrote:
>> AFAICT there is no equivalent of erstwhile notify_page_fault() during page
>> fault handling in arc and mips archs which can call this generic function.
>> Please let me know if that is not the case.
> For ARC do_page_fault() is entered for MMU exceptions (TLB Miss, access violations
> r/w/x etc). kprobes uses a combination of UNIMP_S and TRAP_S instructions which
> don't funnel into do_page_fault().
> UINMP_S leads to
> TRAP_S 2 leads to
> But indeed we are *not* calling into kprobe_fault_handler() - from eithet of those
> paths and not sure if the existing arc*_kprobe_handler() combination does the
> equivalent in tandem.
@Eugeniy can you please investigate this - do we have krpobes bit rot in ARC port.