include/linux/mmdebug.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef LINUX_MM_DEBUG_H
   3 #define LINUX_MM_DEBUG_H 1
   4
   5 #include <linux/bug.h>
   6 #include <linux/stringify.h>
   7
   8 struct page;
   9 struct vm_area_struct;
  10 struct mm_struct;
  11
  12 void dump_page(struct page *page, const char *reason);
  13 void dump_vma(const struct vm_area_struct *vma);
  14 void dump_mm(const struct mm_struct *mm);
  15
  16 #ifdef CONFIG_DEBUG_VM
  17 #define VM_BUG_ON(cond) BUG_ON(cond)
  18 #define VM_BUG_ON_PAGE(cond, page)                                      \
  19         do {                                                            \
  20                 if (unlikely(cond)) {                                   \
  21                         dump_page(page, "VM_BUG_ON_PAGE(" __stringify(cond)")");\
  22                         BUG();                                          \
  23                 }                                                       \
  24         } while (0)
  25 #define VM_BUG_ON_VMA(cond, vma)                                        \
  26         do {                                                            \
  27                 if (unlikely(cond)) {                                   \
  28                         dump_vma(vma);                                  \
  29                         BUG();                                          \
  30                 }                                                       \
  31         } while (0)
  32 #define VM_BUG_ON_MM(cond, mm)                                          \
  33         do {                                                            \
  34                 if (unlikely(cond)) {                                   \
  35                         dump_mm(mm);                                    \
  36                         BUG();                                          \
  37                 }                                                       \
  38         } while (0)
  39 #define VM_WARN_ON_ONCE_PAGE(cond, page)        ({                      \
  40         static bool __section(".data.once") __warned;                   \
  41         int __ret_warn_once = !!(cond);                                 \
  42                                                                         \
  43         if (unlikely(__ret_warn_once && !__warned)) {                   \
  44                 dump_page(page, "VM_WARN_ON_ONCE_PAGE(" __stringify(cond)")");\
  45                 __warned = true;                                        \
  46                 WARN_ON(1);                                             \
  47         }                                                               \
  48         unlikely(__ret_warn_once);                                      \
  49 })
  50
  51 #define VM_WARN_ON(cond) (void)WARN_ON(cond)
  52 #define VM_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond)
  53 #define VM_WARN_ONCE(cond, format...) (void)WARN_ONCE(cond, format)
  54 #define VM_WARN(cond, format...) (void)WARN(cond, format)
  55 #else
  56 #define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)
  57 #define VM_BUG_ON_PAGE(cond, page) VM_BUG_ON(cond)
  58 #define VM_BUG_ON_VMA(cond, vma) VM_BUG_ON(cond)
  59 #define VM_BUG_ON_MM(cond, mm) VM_BUG_ON(cond)
  60 #define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)
  61 #define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
  62 #define VM_WARN_ON_ONCE_PAGE(cond, page)  BUILD_BUG_ON_INVALID(cond)
  63 #define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
  64 #define VM_WARN(cond, format...) BUILD_BUG_ON_INVALID(cond)
  65 #endif
  66
  67 #ifdef CONFIG_DEBUG_VIRTUAL
  68 #define VIRTUAL_BUG_ON(cond) BUG_ON(cond)
  69 #else
  70 #define VIRTUAL_BUG_ON(cond) do { } while (0)
  71 #endif
  72
  73 #ifdef CONFIG_DEBUG_VM_PGFLAGS
  74 #define VM_BUG_ON_PGFLAGS(cond, page) VM_BUG_ON_PAGE(cond, page)
  75 #else
  76 #define VM_BUG_ON_PGFLAGS(cond, page) BUILD_BUG_ON_INVALID(cond)
  77 #endif
  78
  79 #endif