xen/p2m: m2p_find_override: use list_for_each_entry_safe

Use list_for_each_entry_safe and remove the spin_lock acquisition in
m2p_find_override.

[upstream git commit 8f2854c]
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 1b267e75158d8d29d888788d0ac12da38a719a34..7ed8cc3434c5f91efb35acd4cebf09923849107d 100644 (file)
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -809,21 +809,17 @@ struct page *m2p_find_override(unsigned long mfn)
 {
        unsigned long flags;
        struct list_head *bucket = &m2p_overrides[mfn_hash(mfn)];
-       struct page *p, *ret;
+       struct page *p, *t, *ret;
 
        ret = NULL;
 
-       spin_lock_irqsave(&m2p_override_lock, flags);
-
-       list_for_each_entry(p, bucket, lru) {
+       list_for_each_entry_safe(p, t, bucket, lru) {
                if (page_private(p) == mfn) {
                        ret = p;
                        break;
                }
        }
 
-       spin_unlock_irqrestore(&m2p_override_lock, flags);
-
        return ret;
 }