[Xen-devel] {PATCH] Add p2m_lock in set_shared_p2m_entry

[Jui-Hao Chiang <juihaochiang@xxxxxxxxx>]

Without the lock, set_shared_p2m_entry() will BUG when xen is compiled with debug=y

Singed-off-by: Jui-Hao Chiang <juihaochiang <at> gmail.com>

--- a/xen/arch/x86/mm/p2m.c    Tue Dec 21 18:10:46 2010 +0000
+++ b/xen/arch/x86/mm/p2m.c    Thu Dec 23 16:40:41 2010 +0800
@@ -2665,7 +2665,9 @@ set_shared_p2m_entry(struct p2m_domain *
     set_gpfn_from_mfn(mfn_x(omfn), INVALID_M2P_ENTRY);
 
     P2M_DEBUG("set shared %lx %lx\n", gfn, mfn_x(mfn));
+    p2m_lock(p2m);
     rc = set_p2m_entry(p2m, gfn, mfn, 0, p2m_ram_shared);
+    p2m_unlock(p2m);
     if ( 0 == rc )
         gdprintk(XENLOG_ERR,
             "set_mmio_p2m_entry: set_p2m_entry failed! mfn=%08lx\n"
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