diff options
Diffstat (limited to 'arch/x86/xen')
| -rw-r--r-- | arch/x86/xen/p2m.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 809fe3536301..4631cf99e714 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -605,7 +605,8 @@ bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn) /* Swap over from MISSING to IDENTITY if needed. */ if (p2m_top[topidx][mididx] == p2m_missing) { - p2m_top[topidx][mididx] = p2m_identity; + WARN_ON(cmpxchg(&p2m_top[topidx][mididx], p2m_missing, + p2m_identity) != p2m_missing); return true; } } |