@@ -706,6 +669,51 @@ static inline int page_to_nid(const stru
}
#endif
+#ifdef CONFIG_SCHED_NUMA
+#ifdef LAST_CPU_NOT_IN_PAGE_FLAGS
+static inline int page_xchg_last_cpu(struct page *page, int cpu)
+{
+ return xchg(&page->_last_cpu, cpu);
+}
+
+static inline int page_last_cpu(struct page *page)
+{
+ return page->_last_cpu;
+}
+#else
+static inline int page_xchg_last_cpu(struct page *page, int cpu)
+{
+ unsigned long old_flags, flags;
+ int last_cpu;
+
+ do {
+ old_flags = flags = page->flags;
+ last_cpu = (flags >> LAST_CPU_PGSHIFT) & LAST_CPU_MASK;
+
+ flags &= ~(LAST_CPU_MASK << LAST_CPU_PGSHIFT);
+ flags |= (cpu & LAST_CPU_MASK) << LAST_CPU_PGSHIFT;
+ } while (unlikely(cmpxchg(&page->flags, old_flags, flags) != old_flags));
+
+ return last_cpu;
+}
+static inline int page_last_cpu(struct page *page)
+{
+ return (page->flags >> LAST_CPU_PGSHIFT) & LAST_CPU_MASK;
+}
+#endif /* LAST_CPU_NOT_IN_PAGE_FLAGS */
+#else /* CONFIG_SCHED_NUMA */
+static inline int page_xchg_last_cpu(struct page *page, int cpu)
+{
+ return page_to_nid(page);
+}
+
+static inline int page_last_cpu(struct page *page)
+{
+ return page_to_nid(page);
+}
+#endif /* CONFIG_SCHED_NUMA */
+