From: Thomas Gleixner <tglx@linutronix.de>
To: Song Liu <songliubraving@fb.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Kernel Team <Kernel-team@fb.com>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
Joerg Roedel <jroedel@suse.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>
Subject: Re: [PATCH] x86/mm/pti: in pti_clone_pgtable() don't increase addr by PUD_SIZE
Date: Tue, 20 Aug 2019 15:39:34 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.21.1908201539200.2223@nanos.tec.linutronix.de> (raw)
In-Reply-To: <44EA504D-2388-49EF-A807-B9712903B146@fb.com>
On Tue, 20 Aug 2019, Song Liu wrote:
> > On Aug 20, 2019, at 4:16 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
> >
> > On Tue, 20 Aug 2019, Peter Zijlstra wrote:
> >> What that code wants to do is skip to the end of the pud, a pmd_size
> >> increase will not do that. And right below this, there's a second
> >> instance of this exact pattern.
> >>
> >> Did I get the below right?
> >>
> >> ---
> >> diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c
> >> index b196524759ec..32b20b3cb227 100644
> >> --- a/arch/x86/mm/pti.c
> >> +++ b/arch/x86/mm/pti.c
> >> @@ -330,12 +330,14 @@ pti_clone_pgtable(unsigned long start, unsigned long end,
> >>
> >> pud = pud_offset(p4d, addr);
> >> if (pud_none(*pud)) {
> >> + addr &= PUD_MASK;
> >> addr += PUD_SIZE;
> >
> > round_up(addr, PUD_SIZE);
>
> I guess we need "round_up(addr + PMD_SIZE, PUD_SIZE)".
Right you are.
next prev parent reply other threads:[~2019-08-20 13:39 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-20 7:51 Song Liu
2019-08-20 9:12 ` Thomas Gleixner
2019-08-20 13:17 ` Song Liu
2019-08-20 10:00 ` Peter Zijlstra
2019-08-20 11:16 ` Thomas Gleixner
2019-08-20 13:21 ` Song Liu
2019-08-20 13:39 ` Thomas Gleixner [this message]
2019-08-20 13:55 ` Rik van Riel
2019-08-20 14:00 ` Song Liu
2019-08-20 16:56 ` [PATCH v2] " Rik van Riel
2019-08-20 13:21 ` [PATCH] " Rik van Riel
2019-08-20 13:19 ` Song Liu
2019-08-20 13:57 ` Dave Hansen
2019-08-20 14:14 ` Song Liu
2019-08-20 14:18 ` Dave Hansen
2019-08-20 16:05 ` Song Liu
2019-08-20 16:38 ` Song Liu
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