* Re: [PATCH] xen: fix upper bound of pmd loop in xen_cleanhighmap()
[not found] <1466658747-1623-1-git-send-email-jgross@suse.com>
@ 2016-06-23 9:56 ` David Vrabel
0 siblings, 0 replies; 2+ messages in thread
From: David Vrabel @ 2016-06-23 9:56 UTC (permalink / raw)
To: Juergen Gross, xen-devel, linux-kernel
Cc: boris.ostrovsky, torvalds, david.vrabel
On 23/06/16 06:12, Juergen Gross wrote:
> xen_cleanhighmap() is operating on level2_kernel_pgt only. The upper
> bound of the loop setting non-kernel-image entries to zero should not
> exceed the size of level2_kernel_pgt.
Applied to for-linus-4.7b, thanks.
David
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* [PATCH] xen: fix upper bound of pmd loop in xen_cleanhighmap()
@ 2016-06-23 5:12 Juergen Gross
0 siblings, 0 replies; 2+ messages in thread
From: Juergen Gross @ 2016-06-23 5:12 UTC (permalink / raw)
To: xen-devel, linux-kernel
Cc: Juergen Gross, boris.ostrovsky, torvalds, david.vrabel
xen_cleanhighmap() is operating on level2_kernel_pgt only. The upper
bound of the loop setting non-kernel-image entries to zero should not
exceed the size of level2_kernel_pgt.
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
---
arch/x86/xen/mmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 478a2de..2693b7e 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1113,7 +1113,7 @@ static void __init xen_cleanhighmap(unsigned long vaddr,
/* NOTE: The loop is more greedy than the cleanup_highmap variant.
* We include the PMD passed in on _both_ boundaries. */
- for (; vaddr <= vaddr_end && (pmd < (level2_kernel_pgt + PAGE_SIZE));
+ for (; vaddr <= vaddr_end && (pmd < (level2_kernel_pgt + PTRS_PER_PMD));
pmd++, vaddr += PMD_SIZE) {
if (pmd_none(*pmd))
continue;
--
2.6.6
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[not found] <1466658747-1623-1-git-send-email-jgross@suse.com>
2016-06-23 9:56 ` [PATCH] xen: fix upper bound of pmd loop in xen_cleanhighmap() David Vrabel
2016-06-23 5:12 Juergen Gross
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