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Message-ID: <54B186AB.70806@redhat.com>
Date: Sat, 10 Jan 2015 21:08:11 +0100
From: Laszlo Ersek <lersek@...hat.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
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 01/10/15 20:56, Linus Torvalds wrote:
> 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.
Ooops! :)
> 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.
Thanks.
Laszlo
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