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_TAINT(taint) (BUGFLAG_WARNING | ((taint) << 8))
9 #define BUG_GET_TAINT(bug) ((bug)->flags >> 8)
13 #include <linux/kernel.h>
17 #ifdef CONFIG_GENERIC_BUG
19 #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
20 unsigned long bug_addr
;
22 signed int bug_addr_disp
;
24 #ifdef CONFIG_DEBUG_BUGVERBOSE
25 #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
34 #endif /* CONFIG_GENERIC_BUG */
37 * Don't use BUG() or BUG_ON() unless there's really no way out; one
38 * example might be detecting data structure corruption in the middle
39 * of an operation that can't be backed out of. If the (sub)system
40 * can somehow continue operating, perhaps with reduced functionality,
41 * it's probably not BUG-worthy.
43 * If you're tempted to BUG(), think again: is completely giving up
44 * really the *only* solution? There are usually better options, where
45 * users don't need to reboot ASAP and can mostly shut down cleanly.
49 printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
54 #ifndef HAVE_ARCH_BUG_ON
55 #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
59 * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
60 * significant issues that need prompt attention if they should ever
61 * appear at runtime. Use the versions with printk format strings
62 * 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
73 #define __WARN() warn_slowpath_null(__FILE__, __LINE__)
74 #define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg)
75 #define __WARN_printf_taint(taint, arg...) \
76 warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg)
78 #define __WARN() __WARN_TAINT(TAINT_WARN)
79 #define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0)
80 #define __WARN_printf_taint(taint, arg...) \
81 do { printk(arg); __WARN_TAINT(taint); } while (0)
85 #define WARN_ON(condition) ({ \
86 int __ret_warn_on = !!(condition); \
87 if (unlikely(__ret_warn_on)) \
89 unlikely(__ret_warn_on); \
94 #define WARN(condition, format...) ({ \
95 int __ret_warn_on = !!(condition); \
96 if (unlikely(__ret_warn_on)) \
97 __WARN_printf(format); \
98 unlikely(__ret_warn_on); \
102 #define WARN_TAINT(condition, taint, format...) ({ \
103 int __ret_warn_on = !!(condition); \
104 if (unlikely(__ret_warn_on)) \
105 __WARN_printf_taint(taint, format); \
106 unlikely(__ret_warn_on); \
109 #define WARN_ON_ONCE(condition) ({ \
110 static bool __section(.data.unlikely) __warned; \
111 int __ret_warn_once = !!(condition); \
113 if (unlikely(__ret_warn_once)) \
114 if (WARN_ON(!__warned)) \
116 unlikely(__ret_warn_once); \
119 #define WARN_ONCE(condition, format...) ({ \
120 static bool __section(.data.unlikely) __warned; \
121 int __ret_warn_once = !!(condition); \
123 if (unlikely(__ret_warn_once)) \
124 if (WARN(!__warned, format)) \
126 unlikely(__ret_warn_once); \
129 #define WARN_TAINT_ONCE(condition, taint, format...) ({ \
130 static bool __section(.data.unlikely) __warned; \
131 int __ret_warn_once = !!(condition); \
133 if (unlikely(__ret_warn_once)) \
134 if (WARN_TAINT(!__warned, taint, format)) \
136 unlikely(__ret_warn_once); \
139 #else /* !CONFIG_BUG */
140 #ifndef HAVE_ARCH_BUG
141 #define BUG() do {} while (1)
144 #ifndef HAVE_ARCH_BUG_ON
145 #define BUG_ON(condition) do { if (condition) ; } while (0)
148 #ifndef HAVE_ARCH_WARN_ON
149 #define WARN_ON(condition) ({ \
150 int __ret_warn_on = !!(condition); \
151 unlikely(__ret_warn_on); \
156 #define WARN(condition, format...) ({ \
157 int __ret_warn_on = !!(condition); \
159 unlikely(__ret_warn_on); \
163 #define WARN_ON_ONCE(condition) WARN_ON(condition)
164 #define WARN_ONCE(condition, format...) WARN(condition, format)
165 #define WARN_TAINT(condition, taint, format...) WARN(condition, format)
166 #define WARN_TAINT_ONCE(condition, taint, format...) WARN(condition, format)
171 * WARN_ON_SMP() is for cases that the warning is either
172 * meaningless for !SMP or may even cause failures.
173 * This is usually used for cases that we have
174 * WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked()
175 * returns 0 for uniprocessor settings.
176 * It can also be used with values that are only defined
186 * void func(struct foo *zoot)
188 * WARN_ON_SMP(!zoot->bar);
190 * For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(),
191 * and should be a nop and return false for uniprocessor.
193 * if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set
197 # define WARN_ON_SMP(x) WARN_ON(x)
200 * Use of ({0;}) because WARN_ON_SMP(x) may be used either as
201 * a stand alone line statement or as a condition in an if ()
203 * A simple "0" would cause gcc to give a "statement has no effect"
206 # define WARN_ON_SMP(x) ({0;})
209 #endif /* __ASSEMBLY__ */