[PATCH v12 03/13] mm: Introduce VM_WARN_ON_PAGE macro

Muchun Song
2021-01-06T14:21:41Z

Very similar to VM_WARN_ON_ONCE_PAGE and VM_BUG_ON_PAGE, add
VM_WARN_ON_PAGE macro.

Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
include/linux/mmdebug.h | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
index 5d0767cb424a..eff5b13a6945 100644
--- a/include/linux/mmdebug.h
+++ b/include/linux/mmdebug.h
@@ -37,6 +37,13 @@ void dump_mm(const struct mm_struct *mm);
BUG(); \
} \
} while (0)
+#define VM_WARN_ON_PAGE(cond, page) \
+ do { \
+ if (unlikely(cond)) { \
+ dump_page(page, "VM_WARN_ON_PAGE(" __stringify(cond)")");\
+ WARN_ON(1); \
+ } \
+ } while (0)
#define VM_WARN_ON_ONCE_PAGE(cond, page) ({ \
static bool __section(".data.once") __warned; \
int __ret_warn_once = !!(cond); \
@@ -60,6 +67,7 @@ void dump_mm(const struct mm_struct *mm);
#define VM_BUG_ON_MM(cond, mm) VM_BUG_ON(cond)
#define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
+#define VM_WARN_ON_PAGE(cond, page) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_ONCE_PAGE(cond, page) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN(cond, format...) BUILD_BUG_ON_INVALID(cond)
--
2.11.0