of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / include / asm-generic / bug.h
blob630dd23722381851ae9f8ba3a838283f3a8aa8e2
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)
10 #endif
12 #ifndef __ASSEMBLY__
13 #include <linux/kernel.h>
15 #ifdef CONFIG_BUG
17 #ifdef CONFIG_GENERIC_BUG
18 struct bug_entry {
19 #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
20 unsigned long bug_addr;
21 #else
22 signed int bug_addr_disp;
23 #endif
24 #ifdef CONFIG_DEBUG_BUGVERBOSE
25 #ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
26 const char *file;
27 #else
28 signed int file_disp;
29 #endif
30 unsigned short line;
31 #endif
32 unsigned short flags;
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.
47 #ifndef HAVE_ARCH_BUG
48 #define BUG() do { \
49 printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
50 panic("BUG!"); \
51 } while (0)
52 #endif
54 #ifndef HAVE_ARCH_BUG_ON
55 #define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
56 #endif
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.
64 #ifndef __WARN_TAINT
65 extern __printf(3, 4)
66 void warn_slowpath_fmt(const char *file, const int line,
67 const char *fmt, ...);
68 extern __printf(4, 5)
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)
77 #else
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)
82 #endif
84 #ifndef WARN_ON
85 #define WARN_ON(condition) ({ \
86 int __ret_warn_on = !!(condition); \
87 if (unlikely(__ret_warn_on)) \
88 __WARN(); \
89 unlikely(__ret_warn_on); \
91 #endif
93 #ifndef WARN
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); \
100 #endif
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)) \
115 __warned = true; \
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)) \
125 __warned = true; \
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)) \
135 __warned = true; \
136 unlikely(__ret_warn_once); \
139 #else /* !CONFIG_BUG */
140 #ifndef HAVE_ARCH_BUG
141 #define BUG() do {} while (1)
142 #endif
144 #ifndef HAVE_ARCH_BUG_ON
145 #define BUG_ON(condition) do { if (condition) ; } while (0)
146 #endif
148 #ifndef HAVE_ARCH_WARN_ON
149 #define WARN_ON(condition) ({ \
150 int __ret_warn_on = !!(condition); \
151 unlikely(__ret_warn_on); \
153 #endif
155 #ifndef WARN
156 #define WARN(condition, format...) ({ \
157 int __ret_warn_on = !!(condition); \
158 no_printk(format); \
159 unlikely(__ret_warn_on); \
161 #endif
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)
168 #endif
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
177 * on SMP:
179 * struct foo {
180 * [...]
181 * #ifdef CONFIG_SMP
182 * int bar;
183 * #endif
184 * };
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
194 * and x is true.
196 #ifdef CONFIG_SMP
197 # define WARN_ON_SMP(x) WARN_ON(x)
198 #else
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 ()
202 * statement.
203 * A simple "0" would cause gcc to give a "statement has no effect"
204 * warning.
206 # define WARN_ON_SMP(x) ({0;})
207 #endif
209 #endif /* __ASSEMBLY__ */
211 #endif