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Index: head/sys/vm/vm_page.h
===================================================================
--- head/sys/vm/vm_page.h
+++ head/sys/vm/vm_page.h
@@ -772,8 +772,13 @@
#define VM_PAGE_ASSERT_PGA_WRITEABLE(m, bits) \
vm_page_assert_pga_writeable(m, bits)
#define vm_page_xbusy_claim(m) do { \
+ u_int _busy_lock; \
+ \
vm_page_assert_xbusied_unchecked((m)); \
- (m)->busy_lock = VPB_CURTHREAD_EXCLUSIVE; \
+ do { \
+ _busy_lock = atomic_load_int(&(m)->busy_lock); \
+ } while (!atomic_cmpset_int(&(m)->busy_lock, _busy_lock, \
+ (_busy_lock & VPB_BIT_FLAGMASK) | VPB_CURTHREAD_EXCLUSIVE)); \
} while (0)
#else
#define VM_PAGE_OBJECT_BUSY_ASSERT(m) (void)0

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