A new local variable is introduced for accessing p2m entry with lock protection.
Cc: Stefano Stabellini <sstabell...@kernel.org>
Signed-off-by: Hillf Danton <hdan...@sina.com>
---
--- a/arch/arm/xen/p2m.c 2019-04-30 12:32:05.363768200 +0800
+++ b/arch/arm/xen/p2m.c 2019-04-30 12:58:19.854334100 +0800
@@ -70,8 +70,9 @@ unsigned long __pfn_to_mfn(unsigned long
entry = rb_entry(n, struct xen_p2m_entry, rbnode_phys);
if (entry->pfn <= pfn &&
entry->pfn + entry->nr_pages > pfn) {
+ unsigned long mfn = entry->mfn + (pfn - entry->pfn);
read_unlock_irqrestore(&p2m_lock, irqflags);
- return entry->mfn + (pfn - entry->pfn);
+ return mfn;
}
if (pfn < entry->pfn)
n = n->rb_left;
--
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