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author | 2014-01-23 15:52:54 -0800 | |
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committer | 2014-01-23 16:36:50 -0800 | |
commit | 309381feaee564281c3d9e90fbca8963bb7428ad (patch) | |
tree | 7e9f990c0cffcb8c5fc90deb1c7eac445c5ada0e /include/linux/mm.h | |
parent | fs/proc/page.c: add PageAnon check to surely detect thp (diff) | |
download | linux-309381feaee564281c3d9e90fbca8963bb7428ad.tar.gz linux-309381feaee564281c3d9e90fbca8963bb7428ad.tar.bz2 linux-309381feaee564281c3d9e90fbca8963bb7428ad.zip |
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
Most of the VM_BUG_ON assertions are performed on a page. Usually, when
one of these assertions fails we'll get a BUG_ON with a call stack and
the registers.
I've recently noticed based on the requests to add a small piece of code
that dumps the page to various VM_BUG_ON sites that the page dump is
quite useful to people debugging issues in mm.
This patch adds a VM_BUG_ON_PAGE(cond, page) which beyond doing what
VM_BUG_ON() does, also dumps the page before executing the actual
BUG_ON.
[akpm@linux-foundation.org: fix up includes]
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mm.h')
-rw-r--r-- | include/linux/mm.h | 29 |
1 files changed, 13 insertions, 16 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 03bbcb84d96e..d9992fc128ca 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -5,6 +5,7 @@ #ifdef __KERNEL__ +#include <linux/mmdebug.h> #include <linux/gfp.h> #include <linux/bug.h> #include <linux/list.h> @@ -303,7 +304,7 @@ static inline int get_freepage_migratetype(struct page *page) */ static inline int put_page_testzero(struct page *page) { - VM_BUG_ON(atomic_read(&page->_count) == 0); + VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0, page); return atomic_dec_and_test(&page->_count); } @@ -364,7 +365,7 @@ static inline int is_vmalloc_or_module_addr(const void *x) static inline void compound_lock(struct page *page) { #ifdef CONFIG_TRANSPARENT_HUGEPAGE - VM_BUG_ON(PageSlab(page)); + VM_BUG_ON_PAGE(PageSlab(page), page); bit_spin_lock(PG_compound_lock, &page->flags); #endif } @@ -372,7 +373,7 @@ static inline void compound_lock(struct page *page) static inline void compound_unlock(struct page *page) { #ifdef CONFIG_TRANSPARENT_HUGEPAGE - VM_BUG_ON(PageSlab(page)); + VM_BUG_ON_PAGE(PageSlab(page), page); bit_spin_unlock(PG_compound_lock, &page->flags); #endif } @@ -447,7 +448,7 @@ static inline bool __compound_tail_refcounted(struct page *page) */ static inline bool compound_tail_refcounted(struct page *page) { - VM_BUG_ON(!PageHead(page)); + VM_BUG_ON_PAGE(!PageHead(page), page); return __compound_tail_refcounted(page); } @@ -456,9 +457,9 @@ static inline void get_huge_page_tail(struct page *page) /* * __split_huge_page_refcount() cannot run from under us. */ - VM_BUG_ON(!PageTail(page)); - VM_BUG_ON(page_mapcount(page) < 0); - VM_BUG_ON(atomic_read(&page->_count) != 0); + VM_BUG_ON_PAGE(!PageTail(page), page); + VM_BUG_ON_PAGE(page_mapcount(page) < 0, page); + VM_BUG_ON_PAGE(atomic_read(&page->_count) != 0, page); if (compound_tail_refcounted(page->first_page)) atomic_inc(&page->_mapcount); } @@ -474,7 +475,7 @@ static inline void get_page(struct page *page) * Getting a normal page or the head of a compound page * requires to already have an elevated page->_count. */ - VM_BUG_ON(atomic_read(&page->_count) <= 0); + VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page); atomic_inc(&page->_count); } @@ -511,13 +512,13 @@ static inline int PageBuddy(struct page *page) static inline void __SetPageBuddy(struct page *page) { - VM_BUG_ON(atomic_read(&page->_mapcount) != -1); + VM_BUG_ON_PAGE(atomic_read(&page->_mapcount) != -1, page); atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE); } static inline void __ClearPageBuddy(struct page *page) { - VM_BUG_ON(!PageBuddy(page)); + VM_BUG_ON_PAGE(!PageBuddy(page), page); atomic_set(&page->_mapcount, -1); } @@ -1401,7 +1402,7 @@ static inline bool ptlock_init(struct page *page) * slab code uses page->slab_cache and page->first_page (for tail * pages), which share storage with page->ptl. */ - VM_BUG_ON(*(unsigned long *)&page->ptl); + VM_BUG_ON_PAGE(*(unsigned long *)&page->ptl, page); if (!ptlock_alloc(page)) return false; spin_lock_init(ptlock_ptr(page)); @@ -1492,7 +1493,7 @@ static inline bool pgtable_pmd_page_ctor(struct page *page) static inline void pgtable_pmd_page_dtor(struct page *page) { #ifdef CONFIG_TRANSPARENT_HUGEPAGE - VM_BUG_ON(page->pmd_huge_pte); + VM_BUG_ON_PAGE(page->pmd_huge_pte, page); #endif ptlock_free(page); } @@ -2029,10 +2030,6 @@ extern void shake_page(struct page *p, int access); extern atomic_long_t num_poisoned_pages; extern int soft_offline_page(struct page *page, int flags); -extern void dump_page(struct page *page, char *reason); -extern void dump_page_badflags(struct page *page, char *reason, - unsigned long badflags); - #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) extern void clear_huge_page(struct page *page, unsigned long addr, |