HWPOISON: Be more aggressive at freeing non LRU caches

shake_page handles more types of page caches than lru_drain_all()

- per cpu page allocator pages
- per CPU LRU

Stops early when the page became free.

Used in followon patches.

Signed-off-by: Andi Kleen <ak@linux.intel.com>

include/linux/mm.h

@@ -1335,6 +1335,7 @@ extern void memory_failure(unsigned long pfn, int trapno);
 extern int __memory_failure(unsigned long pfn, int trapno, int ref);
 extern int sysctl_memory_failure_early_kill;
 extern int sysctl_memory_failure_recovery;
+extern void shake_page(struct page *p);
 extern atomic_long_t mce_bad_pages;
 
 #endif /* __KERNEL__ */