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