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| author | Sasha Levin <sasha.levin@oracle.com> | 2014-01-23 15:52:54 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-23 16:36:50 -0800 |
| commit | 309381feaee564281c3d9e90fbca8963bb7428ad (patch) | |
| tree | 7e9f990c0cffcb8c5fc90deb1c7eac445c5ada0e /mm/hugetlb_cgroup.c | |
| parent | e3bba3c3c90cd434c1ccb9e5dc704a96baf9541c (diff) | |
| download | lwn-309381feaee564281c3d9e90fbca8963bb7428ad.tar.gz lwn-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 'mm/hugetlb_cgroup.c')
| -rw-r--r-- | mm/hugetlb_cgroup.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c index d747a84e09b0..cb00829bb466 100644 --- a/mm/hugetlb_cgroup.c +++ b/mm/hugetlb_cgroup.c @@ -390,7 +390,7 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage) if (hugetlb_cgroup_disabled()) return; - VM_BUG_ON(!PageHuge(oldhpage)); + VM_BUG_ON_PAGE(!PageHuge(oldhpage), oldhpage); spin_lock(&hugetlb_lock); h_cg = hugetlb_cgroup_from_page(oldhpage); set_hugetlb_cgroup(oldhpage, NULL); |