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TOMOYO Linux Cross Reference
Linux/include/linux/bug.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _LINUX_BUG_H
  3 #define _LINUX_BUG_H
  4 
  5 #include <asm/bug.h>
  6 #include <linux/compiler.h>
  7 #include <linux/build_bug.h>
  8 
  9 enum bug_trap_type {
 10         BUG_TRAP_TYPE_NONE = 0,
 11         BUG_TRAP_TYPE_WARN = 1,
 12         BUG_TRAP_TYPE_BUG = 2,
 13 };
 14 
 15 struct pt_regs;
 16 
 17 #ifdef __CHECKER__
 18 #define MAYBE_BUILD_BUG_ON(cond) (0)
 19 #else /* __CHECKER__ */
 20 
 21 #define MAYBE_BUILD_BUG_ON(cond)                        \
 22         do {                                            \
 23                 if (__builtin_constant_p((cond)))       \
 24                         BUILD_BUG_ON(cond);             \
 25                 else                                    \
 26                         BUG_ON(cond);                   \
 27         } while (0)
 28 
 29 #endif  /* __CHECKER__ */
 30 
 31 #ifdef CONFIG_GENERIC_BUG
 32 #include <asm-generic/bug.h>
 33 
 34 static inline int is_warning_bug(const struct bug_entry *bug)
 35 {
 36         return bug->flags & BUGFLAG_WARNING;
 37 }
 38 
 39 void bug_get_file_line(struct bug_entry *bug, const char **file,
 40                        unsigned int *line);
 41 
 42 struct bug_entry *find_bug(unsigned long bugaddr);
 43 
 44 enum bug_trap_type report_bug(unsigned long bug_addr, struct pt_regs *regs);
 45 
 46 /* These are defined by the architecture */
 47 int is_valid_bugaddr(unsigned long addr);
 48 
 49 void generic_bug_clear_once(void);
 50 
 51 #else   /* !CONFIG_GENERIC_BUG */
 52 
 53 static inline void *find_bug(unsigned long bugaddr)
 54 {
 55         return NULL;
 56 }
 57 
 58 static inline enum bug_trap_type report_bug(unsigned long bug_addr,
 59                                             struct pt_regs *regs)
 60 {
 61         return BUG_TRAP_TYPE_BUG;
 62 }
 63 
 64 struct bug_entry;
 65 static inline void bug_get_file_line(struct bug_entry *bug, const char **file,
 66                                      unsigned int *line)
 67 {
 68         *file = NULL;
 69         *line = 0;
 70 }
 71 
 72 static inline void generic_bug_clear_once(void) {}
 73 
 74 #endif  /* CONFIG_GENERIC_BUG */
 75 
 76 /*
 77  * Since detected data corruption should stop operation on the affected
 78  * structures. Return value must be checked and sanely acted on by caller.
 79  */
 80 static inline __must_check bool check_data_corruption(bool v) { return v; }
 81 #define CHECK_DATA_CORRUPTION(condition, fmt, ...)                       \
 82         check_data_corruption(({                                         \
 83                 bool corruption = unlikely(condition);                   \
 84                 if (corruption) {                                        \
 85                         if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \
 86                                 pr_err(fmt, ##__VA_ARGS__);              \
 87                                 BUG();                                   \
 88                         } else                                           \
 89                                 WARN(1, fmt, ##__VA_ARGS__);             \
 90                 }                                                        \
 91                 corruption;                                              \
 92         }))
 93 
 94 #endif  /* _LINUX_BUG_H */
 95 

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