linux-kernel - [Patch V2 4/4] xen: check for zero sized area when invalidating memory

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Date:	Mon, 12 Jan 2015 06:05:10 +0100
From:	Juergen Gross <jgross@...e.com>
To:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	konrad.wilk@...cle.com, david.vrabel@...rix.com,
	boris.ostrovsky@...cle.com, jbeulich@...e.com
Cc:	Juergen Gross <jgross@...e.com>
Subject: [Patch V2 4/4] xen: check for zero sized area when invalidating memory

With the introduction of the linear mapped p2m list setting memory
areas to "invalid" had to be delayed. When doing the invalidation
make sure no zero sized areas are processed.

Signed-off-by: Juegren Gross <jgross@...e.com>
---
 arch/x86/xen/setup.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 410210f..865e56c 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -160,6 +160,8 @@ void __init xen_inv_extra_mem(void)
 	int i;
 
 	for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
+		if (!xen_extra_mem[i].size)
+			continue;
 		pfn_s = PFN_DOWN(xen_extra_mem[i].start);
 		pfn_e = PFN_UP(xen_extra_mem[i].start + xen_extra_mem[i].size);
 		for (pfn = pfn_s; pfn < pfn_e; pfn++)
-- 
2.1.2

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