linux-kernel - Re: [RFC PATCH 2/4] mm: Change the interface for __tlb_remove

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Date:	Tue, 31 May 2016 11:52:48 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"'Aneesh Kumar K.V'" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	"'linux-kernel'" <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>
Subject: Re: [RFC PATCH 2/4] mm: Change the interface for __tlb_remove_page

> >> @@ -1202,7 +1205,12 @@ again:
> >>  	if (force_flush) {
> >>  		force_flush = 0;
> >>  		tlb_flush_mmu_free(tlb);
> >> -
> >> +		if (pending_page) {
> >> +			/* remove the page with new size */
> >> +			__tlb_adjust_range(tlb, tlb->addr);
> >
> > Would you please specify why tlb->addr is used here?
> >
> 
> That is needed because tlb_flush_mmu_tlbonly() does a __tlb_reset_range().
> 
If ->addr is updated in resetting, then it is a noop here to deliver tlb->addr to
__tlb_adjust_range().
On the other hand, if ->addr is not updated in resetting, then it is also a noop here.

Do you want to update ->addr here?

thanks
Hillf