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

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Date:	Tue, 7 Jul 2015 14:47:41 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	wenwei tao <wenweitaowenwei@...il.com>
CC:	Izik Eidus <izik.eidus@...ellosystems.com>, <aarcange@...hat.com>,
	<chrisw@...s-sol.org>, Hugh Dickins <hughd@...gle.com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
	<x86@...nel.org>, <viro@...iv.linux.org.uk>, <linux-mm@...ck.org>,
	<linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <kvm@...r.kernel.org>,
	<kvm-ppc@...r.kernel.org>
Subject: Re: [RFC PATCH 6/6] powerpc/kvm: change the condition of
 identifying hugetlb vm

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

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