Revert commit 7f1290f2f2a4 ("mm: fix-up zone present pages") That patch tried to fix a issue when calculating zone->present_pages, but it caused a regression on 32bit systems with HIGHMEM. With that change, reset_zone_present_pages() resets all zone->present_pages to zero, and fixup_zone_present_pages() is called to recalculate zone->present_pages when the boot allocator frees core memory pages into buddy allocator. Because highmem pages are not freed by bootmem allocator, all highmem zones' present_pages becomes zero. Various options for improving the situation are being discussed but for now, let's return to the 3.6 code.
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| @@ -1684,9 +1684,5 @@ static inline unsigned int debug_guardpage_minorder(void) { return 0; } · 1683 unmodified lines | ||
| 1684 | 1684 | static inline bool page_is_guard(struct page *page) { return false; } |
| 1685 | 1685 | #endif /* CONFIG_DEBUG_PAGEALLOC */ |
| 1686 | 1686 | |
| 1687 | −extern void reset_zone_present_pages(void); | |
| 1688 | −extern void fixup_zone_present_pages(int nid, unsigned long start_pfn, | |
| 1689 | − unsigned long end_pfn); | |
| 1690 | − | |
| 1691 | 1687 | #endif /* __KERNEL__ */ |
| 1692 | 1688 | #endif /* _LINUX_MM_H */ |