1 #ifndef _ASM_GENERIC_BUG_H
2 #define _ASM_GENERIC_BUG_H
4 #include <linux/compiler.h>
5 #include <linux/kernel.h>
9 #ifdef CONFIG_GENERIC_BUG
12 #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
13 unsigned long bug_addr;
15 signed int bug_addr_disp;
17 #ifdef CONFIG_DEBUG_BUGVERBOSE
18 #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
27 #endif /* __ASSEMBLY__ */
29 #define BUGFLAG_WARNING (1 << 0)
30 #define BUGFLAG_TAINT(taint) (BUGFLAG_WARNING | ((taint) << 8))
31 #define BUG_GET_TAINT(bug) ((bug)->flags >> 8)
33 #endif /* CONFIG_GENERIC_BUG */
36 * Don't use BUG() or BUG_ON() unless there's really no way out; one
37 * example might be detecting data structure corruption in the middle
38 * of an operation that can't be backed out of. If the (sub)system
39 * can somehow continue operating, perhaps with reduced functionality,
40 * it's probably not BUG-worthy.
42 * If you're tempted to BUG(), think again: is completely giving up
43 * really the *only* solution? There are usually better options, where
44 * users don't need to reboot ASAP and can mostly shut down cleanly.
48 printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
53 #ifndef HAVE_ARCH_BUG_ON
54 #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while(0)
58 * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
59 * significant issues that need prompt attention if they should ever
60 * appear at runtime. Use the versions with printk format strings
61 * to provide better diagnostics.
66 void warn_slowpath_fmt(const char *file, const int line,
67 const char *fmt, ...);
69 void warn_slowpath_fmt_taint(const char *file, const int line, unsigned taint,
70 const char *fmt, ...);
71 extern void warn_slowpath_null(const char *file, const int line);
72 #define WANT_WARN_ON_SLOWPATH
74 #define __WARN() warn_slowpath_null(__FILE__, __LINE__)
75 #define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg)
76 #define __WARN_printf_taint(taint, arg...) \
77 warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg)
79 #define __WARN() __WARN_TAINT(TAINT_WARN)
80 #define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0)
81 #define __WARN_printf_taint(taint, arg...) \
82 do { printk(arg); __WARN_TAINT(taint); } while (0)
86 #define WARN_ON(condition) ({ \
87 int __ret_warn_on = !!(condition); \
88 if (unlikely(__ret_warn_on)) \
90 unlikely(__ret_warn_on); \
95 #define WARN(condition, format...) ({ \
96 int __ret_warn_on = !!(condition); \
97 if (unlikely(__ret_warn_on)) \
98 __WARN_printf(format); \
99 unlikely(__ret_warn_on); \
103 #define WARN_TAINT(condition, taint, format...) ({ \
104 int __ret_warn_on = !!(condition); \
105 if (unlikely(__ret_warn_on)) \
106 __WARN_printf_taint(taint, format); \
107 unlikely(__ret_warn_on); \
110 #else /* !CONFIG_BUG */
111 #ifndef HAVE_ARCH_BUG
112 #define BUG() do {} while(0)
115 #ifndef HAVE_ARCH_BUG_ON
116 #define BUG_ON(condition) do { if (condition) ; } while(0)
119 #ifndef HAVE_ARCH_WARN_ON
120 #define WARN_ON(condition) ({ \
121 int __ret_warn_on = !!(condition); \
122 unlikely(__ret_warn_on); \
127 #define WARN(condition, format...) ({ \
128 int __ret_warn_on = !!(condition); \
129 unlikely(__ret_warn_on); \
133 #define WARN_TAINT(condition, taint, format...) WARN_ON(condition)
137 #define WARN_ON_ONCE(condition) ({ \
138 static bool __section(.data.unlikely) __warned; \
139 int __ret_warn_once = !!(condition); \
141 if (unlikely(__ret_warn_once)) \
142 if (WARN_ON(!__warned)) \
144 unlikely(__ret_warn_once); \
147 #define WARN_ONCE(condition, format...) ({ \
148 static bool __section(.data.unlikely) __warned; \
149 int __ret_warn_once = !!(condition); \
151 if (unlikely(__ret_warn_once)) \
152 if (WARN(!__warned, format)) \
154 unlikely(__ret_warn_once); \
157 #define WARN_TAINT_ONCE(condition, taint, format...) ({ \
158 static bool __section(.data.unlikely) __warned; \
159 int __ret_warn_once = !!(condition); \
161 if (unlikely(__ret_warn_once)) \
162 if (WARN_TAINT(!__warned, taint, format)) \
164 unlikely(__ret_warn_once); \
168 * WARN_ON_SMP() is for cases that the warning is either
169 * meaningless for !SMP or may even cause failures.
170 * This is usually used for cases that we have
171 * WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked()
172 * returns 0 for uniprocessor settings.
173 * It can also be used with values that are only defined
183 * void func(struct foo *zoot)
185 * WARN_ON_SMP(!zoot->bar);
187 * For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(),
188 * and should be a nop and return false for uniprocessor.
190 * if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set
194 # define WARN_ON_SMP(x) WARN_ON(x)
197 * Use of ({0;}) because WARN_ON_SMP(x) may be used either as
198 * a stand alone line statement or as a condition in an if ()
200 * A simple "0" would cause gcc to give a "statement has no effect"
203 # define WARN_ON_SMP(x) ({0;})