mm: downgrade VM_BUG in isolate_lru_page() to warning

Calling isolate_lru_page() is wrong and shouldn't happen, but it not
nessesary fatal: the page just will not be isolated if it's not on LRU.

Let's downgrade the VM_BUG_ON_PAGE() to WARN_RATELIMIT().

Signed-off-by: Kirill A. Shutemov <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/vmscan.c b/mm/vmscan.c
index eb3dd37ccd7c727dcc0b6030f62c183097b956bb..71b1c29948dba30aab0a894ddc7c84eb62acde2b 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1443,7 +1443,7 @@ int isolate_lru_page(struct page *page)
        int ret = -EBUSY;
 
        VM_BUG_ON_PAGE(!page_count(page), page);
-       VM_BUG_ON_PAGE(PageTail(page), page);
+       WARN_RATELIMIT(PageTail(page), "trying to isolate tail page");
 
        if (PageLRU(page)) {
                struct zone *zone = page_zone(page);