linux-kernel - Re: Linux 3.19-rc3

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Message-ID: <CA+55aFzXYhyBW_pF___69o98uq7nnH60wvnTr37RYmrjQgsdQA@mail.gmail.com>
Date:	Sat, 10 Jan 2015 11:56:55 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Laszlo Ersek <lersek@...hat.com>
Cc:	Will Deacon <will.deacon@....com>,
	Mark Langsdorf <mlangsdo@...hat.com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Steve Capper <steve.capper@...aro.org>,
	"vishnu.ps@...sung.com" <vishnu.ps@...sung.com>,
	main kernel list <linux-kernel@...r.kernel.org>,
	arm kernel list <linux-arm-kernel@...ts.infradead.org>,
	Kyle McMartin <kmcmarti@...hat.com>
Subject: Re: Linux 3.19-rc3

On Sat, Jan 10, 2015 at 11:47 AM, Laszlo Ersek <lersek@...hat.com> wrote:
>
> I grepped the tree for "fullmm", and only tlb_gather_mmu() seems to set
> it. There are several instances of that function, but each sets fullmm to:
>
>         /* Is it from 0 to ~0? */
>         tlb->fullmm     = !(start | (end+1));
>
> So, a nonzero fullmm seems to imply (end == ~0UL).

Yes. But note how it imples "end == ~0ul", but it does *not* imply
"tlb->end" having that value.

tlb->end is initialized to zero (not obvious, but it's what the call
to __tlb_reset_range() does). It's then updated by
__tlb_adjust_range() as we actually flush individual pages.

                           Linus
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