[RFC 07/11] mm: debug: VM_BUG()

[Sasha Levin <sasha.levin@oracle.com>]

VM_BUG() complements VM_BUG_ON() just like with WARN() and WARN_ON().

This lets us format custom strings to output when a VM_BUG() is hit.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---
 include/linux/mmdebug.h |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
index 8b3f5a0..42f41e3 100644
--- a/include/linux/mmdebug.h
+++ b/include/linux/mmdebug.h
@@ -12,7 +12,14 @@ char *format_page(struct page *page, char *buf, char *end);
 #ifdef CONFIG_DEBUG_VM
 char *format_vma(const struct vm_area_struct *vma, char *buf, char *end);
 char *format_mm(const struct mm_struct *mm, char *buf, char *end);
-#define VM_BUG_ON(cond) BUG_ON(cond)
+#define VM_BUG(cond, fmt...)						\
+	do {								\
+		if (unlikely(cond)) {					\
+			pr_emerg(fmt);					\
+			BUG();						\
+		}							\
+	} while (0)
+#define VM_BUG_ON(cond) VM_BUG(cond, "%s\n", __stringify(cond))
 #define VM_BUG_ON_PAGE(cond, page)					\
 	do {								\
 		if (unlikely(cond)) {					\
@@ -46,6 +53,7 @@ static char *format_mm(const struct mm_struct *mm, char *buf, char *end)
 {
 	return buf;
 }
+#define VM_BUG(cond, fmt...) BUILD_BUG_ON_INVALID(cond)
 #define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)
 #define VM_BUG_ON_PAGE(cond, page) VM_BUG_ON(cond)
 #define VM_BUG_ON_VMA(cond, vma) VM_BUG_ON(cond)
-- 
1.7.10.4

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