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>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/compaction.c b/mm/compaction.c
index 3a91a2ea3d34..e0ab02d70f13 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -601,7 +601,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
                 if (__isolate_lru_page(page, mode) != 0)
                         continue;
 
-                VM_BUG_ON(PageTransCompound(page));
+                VM_BUG_ON_PAGE(PageTransCompound(page), page);
 
                 /* Successfully isolated */
                 cc->finished_update_migrate = true;