Re: [RFC PATCH 6/6] powerpc/kvm: change the condition of identifying hugetlb vm

Scott Wood
2015-07-07T19:48:00Z

On Tue, 2015-07-07 at 16:05 +0800, wenwei tao wrote:
> Hi Scott
>
> I understand what you said.
>
> I will use the function 'is_vm_hugetlb_page()' to hide the bit
> combinations according to your comments in the next version of patch
> set.
>
> But for the situation like below, there isn't an obvious structure
> 'vma', using 'is_vm_hugetlb_page()' maybe costly or even not possible.
> void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
> unsigned long end, unsigned long vmflag)
> {
> ...
>
> if (end == TLB_FLUSH_ALL || tlb_flushall_shift == -1
> || vmflag & VM_HUGETLB) {
> local_flush_tlb();
> goto flush_all;
> }
> ...
> }

Add a function that operates on the flags directly, then.

-Scott