| From c525e55bd26fb4239466f64e9f43f73a1c77e4b0 Mon Sep 17 00:00:00 2001 |
| From: Wei Yang <richardw.yang@linux.intel.com> |
| Date: Thu, 30 Jan 2020 22:14:29 -0800 |
| Subject: [PATCH] mm/huge_memory.c: use head to check huge zero page |
| |
| commit cb829624867b5ab10bc6a7036d183b1b82bfe9f8 upstream. |
| |
| The page could be a tail page, if this is the case, this BUG_ON will |
| never be triggered. |
| |
| Link: http://lkml.kernel.org/r/20200110032610.26499-1-richardw.yang@linux.intel.com |
| Fixes: e9b61f19858a ("thp: reintroduce split_huge_page()") |
| |
| Signed-off-by: Wei Yang <richardw.yang@linux.intel.com> |
| Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> |
| Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
| Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
| Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> |
| |
| diff --git a/mm/huge_memory.c b/mm/huge_memory.c |
| index 2b90d4f85df5..aae6027dc82d 100644 |
| --- a/mm/huge_memory.c |
| +++ b/mm/huge_memory.c |
| @@ -2674,7 +2674,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list) |
| unsigned long flags; |
| pgoff_t end; |
| |
| - VM_BUG_ON_PAGE(is_huge_zero_page(page), page); |
| + VM_BUG_ON_PAGE(is_huge_zero_page(head), head); |
| VM_BUG_ON_PAGE(!PageLocked(page), page); |
| VM_BUG_ON_PAGE(!PageCompound(page), page); |
| |
| -- |
| 2.7.4 |
| |
