1 #ifndef _ASM_GENERIC_BUG_H
2 #define _ASM_GENERIC_BUG_H
4 #include <linux/compiler.h>
6 #ifdef CONFIG_GENERIC_BUG
7 #define BUGFLAG_WARNING (1 << 0)
8 #define BUGFLAG_ONCE (1 << 1)
9 #define BUGFLAG_DONE (1 << 2)
10 #define BUGFLAG_TAINT(taint) ((taint) << 8)
11 #define BUG_GET_TAINT(bug) ((bug)->flags >> 8)
15 #include <linux/kernel.h>
19 #ifdef CONFIG_GENERIC_BUG
21 #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
22 unsigned long bug_addr;
24 signed int bug_addr_disp;
26 #ifdef CONFIG_DEBUG_BUGVERBOSE
27 #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
36 #endif /* CONFIG_GENERIC_BUG */
39 * Don't use BUG() or BUG_ON() unless there's really no way out; one
40 * example might be detecting data structure corruption in the middle
41 * of an operation that can't be backed out of. If the (sub)system
42 * can somehow continue operating, perhaps with reduced functionality,
43 * it's probably not BUG-worthy.
45 * If you're tempted to BUG(), think again: is completely giving up
46 * really the *only* solution? There are usually better options, where
47 * users don't need to reboot ASAP and can mostly shut down cleanly.
51 printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
56 #ifndef HAVE_ARCH_BUG_ON
57 #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
61 #define __WARN_TAINT(taint) __WARN_FLAGS(BUGFLAG_TAINT(taint))
62 #define __WARN_ONCE_TAINT(taint) __WARN_FLAGS(BUGFLAG_ONCE|BUGFLAG_TAINT(taint))
64 #define WARN_ON_ONCE(condition) ({ \
65 int __ret_warn_on = !!(condition); \
66 if (unlikely(__ret_warn_on)) \
67 __WARN_ONCE_TAINT(TAINT_WARN); \
68 unlikely(__ret_warn_on); \
73 * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
74 * significant issues that need prompt attention if they should ever
75 * appear at runtime. Use the versions with printk format strings
76 * to provide better diagnostics.
80 void warn_slowpath_fmt(const char *file, const int line,
81 const char *fmt, ...);
83 void warn_slowpath_fmt_taint(const char *file, const int line, unsigned taint,
84 const char *fmt, ...);
85 extern void warn_slowpath_null(const char *file, const int line);
86 #define WANT_WARN_ON_SLOWPATH
87 #define __WARN() warn_slowpath_null(__FILE__, __LINE__)
88 #define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg)
89 #define __WARN_printf_taint(taint, arg...) \
90 warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg)
92 #define __WARN() __WARN_TAINT(TAINT_WARN)
93 #define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0)
94 #define __WARN_printf_taint(taint, arg...) \
95 do { printk(arg); __WARN_TAINT(taint); } while (0)
98 /* used internally by panic.c */
101 void __warn(const char *file, int line, void *caller, unsigned taint,
102 struct pt_regs *regs, struct warn_args *args);
105 #define WARN_ON(condition) ({ \
106 int __ret_warn_on = !!(condition); \
107 if (unlikely(__ret_warn_on)) \
109 unlikely(__ret_warn_on); \
114 #define WARN(condition, format...) ({ \
115 int __ret_warn_on = !!(condition); \
116 if (unlikely(__ret_warn_on)) \
117 __WARN_printf(format); \
118 unlikely(__ret_warn_on); \
122 #define WARN_TAINT(condition, taint, format...) ({ \
123 int __ret_warn_on = !!(condition); \
124 if (unlikely(__ret_warn_on)) \
125 __WARN_printf_taint(taint, format); \
126 unlikely(__ret_warn_on); \
130 #define WARN_ON_ONCE(condition) ({ \
131 static bool __section(.data.unlikely) __warned; \
132 int __ret_warn_once = !!(condition); \
134 if (unlikely(__ret_warn_once && !__warned)) { \
138 unlikely(__ret_warn_once); \
142 #define WARN_ONCE(condition, format...) ({ \
143 static bool __section(.data.unlikely) __warned; \
144 int __ret_warn_once = !!(condition); \
146 if (unlikely(__ret_warn_once && !__warned)) { \
150 unlikely(__ret_warn_once); \
153 #define WARN_TAINT_ONCE(condition, taint, format...) ({ \
154 static bool __section(.data.unlikely) __warned; \
155 int __ret_warn_once = !!(condition); \
157 if (unlikely(__ret_warn_once && !__warned)) { \
159 WARN_TAINT(1, taint, format); \
161 unlikely(__ret_warn_once); \
164 #else /* !CONFIG_BUG */
165 #ifndef HAVE_ARCH_BUG
166 #define BUG() do {} while (1)
169 #ifndef HAVE_ARCH_BUG_ON
170 #define BUG_ON(condition) do { if (condition) BUG(); } while (0)
173 #ifndef HAVE_ARCH_WARN_ON
174 #define WARN_ON(condition) ({ \
175 int __ret_warn_on = !!(condition); \
176 unlikely(__ret_warn_on); \
181 #define WARN(condition, format...) ({ \
182 int __ret_warn_on = !!(condition); \
184 unlikely(__ret_warn_on); \
188 #define WARN_ON_ONCE(condition) WARN_ON(condition)
189 #define WARN_ONCE(condition, format...) WARN(condition, format)
190 #define WARN_TAINT(condition, taint, format...) WARN(condition, format)
191 #define WARN_TAINT_ONCE(condition, taint, format...) WARN(condition, format)
196 * WARN_ON_SMP() is for cases that the warning is either
197 * meaningless for !SMP or may even cause failures.
198 * This is usually used for cases that we have
199 * WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked()
200 * returns 0 for uniprocessor settings.
201 * It can also be used with values that are only defined
211 * void func(struct foo *zoot)
213 * WARN_ON_SMP(!zoot->bar);
215 * For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(),
216 * and should be a nop and return false for uniprocessor.
218 * if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set
222 # define WARN_ON_SMP(x) WARN_ON(x)
225 * Use of ({0;}) because WARN_ON_SMP(x) may be used either as
226 * a stand alone line statement or as a condition in an if ()
228 * A simple "0" would cause gcc to give a "statement has no effect"
231 # define WARN_ON_SMP(x) ({0;})
234 #endif /* __ASSEMBLY__ */