From: Joerg Roedel <jroedel@suse.de>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Joerg Roedel <joro@8bytes.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 2/3] x86/mm: Sync also unmappings in vmalloc_sync_one()
Date: Thu, 18 Jul 2019 10:46:54 +0200 [thread overview]
Message-ID: <20190718084654.GF13091@suse.de> (raw)
In-Reply-To: <alpine.DEB.2.21.1907172337590.1778@nanos.tec.linutronix.de>
Hi Thomas,
On Wed, Jul 17, 2019 at 11:43:43PM +0200, Thomas Gleixner wrote:
> On Wed, 17 Jul 2019, Joerg Roedel wrote:
> > +
> > + if (!pmd_present(*pmd_k))
> > + return NULL;
> > else
> > BUG_ON(pmd_pfn(*pmd) != pmd_pfn(*pmd_k));
>
> So in case of unmap, this updates only the first entry in the pgd_list
> because vmalloc_sync_all() will break out of the iteration over pgd_list
> when NULL is returned from vmalloc_sync_one().
>
> I'm surely missing something, but how is that supposed to sync _all_ page
> tables on unmap as the changelog claims?
No, you are right, I missed that. It is a bug in this patch, the code
that breaks out of the loop in vmalloc_sync_all() needs to be removed as
well. Will do that in the next version.
Thanks,
Joerg
next prev parent reply other threads:[~2019-07-18 8:46 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-17 7:14 [PATCH 0/3 v2] Sync unmappings in vmalloc/ioremap areas Joerg Roedel
2019-07-17 7:14 ` [PATCH 1/3] x86/mm: Check for pfn instead of page in vmalloc_sync_one() Joerg Roedel
2019-07-17 7:14 ` [PATCH 2/3] x86/mm: Sync also unmappings " Joerg Roedel
2019-07-17 21:06 ` Dave Hansen
2019-07-18 8:44 ` Joerg Roedel
2019-07-17 21:43 ` Thomas Gleixner
2019-07-18 8:46 ` Joerg Roedel [this message]
2019-07-18 9:04 ` Thomas Gleixner
2019-07-18 9:25 ` Joerg Roedel
2019-07-19 14:01 ` Joerg Roedel
2019-07-19 21:10 ` Thomas Gleixner
2019-07-17 7:14 ` [PATCH 3/3] mm/vmalloc: Sync unmappings in vunmap_page_range() Joerg Roedel
2019-07-17 21:24 ` Andy Lutomirski
2019-07-18 9:17 ` Joerg Roedel
2019-07-18 19:04 ` Andy Lutomirski
2019-07-19 12:21 ` Joerg Roedel
2019-07-19 12:24 ` Andy Lutomirski
2019-07-19 13:00 ` Joerg Roedel
-- strict thread matches above, loose matches on Subject: below --
2019-07-15 11:02 [PATCH 0/3] Sync unmappings in vmalloc/ioremap areas Joerg Roedel
2019-07-15 11:02 ` [PATCH 2/3] x86/mm: Sync also unmappings in vmalloc_sync_one() Joerg Roedel
2019-07-15 13:08 ` Thomas Gleixner
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