projects/linux·blob v3.13 · refs

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1#ifndef _ASM_GENERIC_BUG_H
2#define _ASM_GENERIC_BUG_H
3
4#include <linux/compiler.h>
5
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
11
12#ifndef __ASSEMBLY__
13#include <linux/kernel.h>
14
15#ifdef CONFIG_BUG
16
17#ifdef CONFIG_GENERIC_BUG
18struct 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;
33};
34#endif /* CONFIG_GENERIC_BUG */
35
36/*
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.
42 *
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.
46 */
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
53
54#ifndef HAVE_ARCH_BUG_ON
55#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while(0)
56#endif
57
58/*
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.
63 */
64#ifndef __WARN_TAINT
65extern __printf(3, 4)
66void warn_slowpath_fmt(const char *file, const int line,
67 const char *fmt, ...);
68extern __printf(4, 5)
69void warn_slowpath_fmt_taint(const char *file, const int line, unsigned taint,
70 const char *fmt, ...);
71extern 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
83
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); \
90})
91#endif
92
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); \
99})
100#endif
101
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); \
107})
108
109#else /* !CONFIG_BUG */
110#ifndef HAVE_ARCH_BUG
111#define BUG() do {} while(0)
112#endif
113
114#ifndef HAVE_ARCH_BUG_ON
115#define BUG_ON(condition) do { if (condition) ; } while(0)
116#endif
117
118#ifndef HAVE_ARCH_WARN_ON
119#define WARN_ON(condition) ({ \
120 int __ret_warn_on = !!(condition); \
121 unlikely(__ret_warn_on); \
122})
123#endif
124
125#ifndef WARN
126#define WARN(condition, format...) ({ \
127 int __ret_warn_on = !!(condition); \
128 unlikely(__ret_warn_on); \
129})
130#endif
131
132#define WARN_TAINT(condition, taint, format...) WARN_ON(condition)
133
134#endif
135
136#define WARN_ON_ONCE(condition) ({ \
137 static bool __section(.data.unlikely) __warned; \
138 int __ret_warn_once = !!(condition); \
139 \
140 if (unlikely(__ret_warn_once)) \
141 if (WARN_ON(!__warned)) \
142 __warned = true; \
143 unlikely(__ret_warn_once); \
144})
145
146#define WARN_ONCE(condition, format...) ({ \
147 static bool __section(.data.unlikely) __warned; \
148 int __ret_warn_once = !!(condition); \
149 \
150 if (unlikely(__ret_warn_once)) \
151 if (WARN(!__warned, format)) \
152 __warned = true; \
153 unlikely(__ret_warn_once); \
154})
155
156#define WARN_TAINT_ONCE(condition, taint, format...) ({ \
157 static bool __section(.data.unlikely) __warned; \
158 int __ret_warn_once = !!(condition); \
159 \
160 if (unlikely(__ret_warn_once)) \
161 if (WARN_TAINT(!__warned, taint, format)) \
162 __warned = true; \
163 unlikely(__ret_warn_once); \
164})
165
166/*
167 * WARN_ON_SMP() is for cases that the warning is either
168 * meaningless for !SMP or may even cause failures.
169 * This is usually used for cases that we have
170 * WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked()
171 * returns 0 for uniprocessor settings.
172 * It can also be used with values that are only defined
173 * on SMP:
174 *
175 * struct foo {
176 * [...]
177 * #ifdef CONFIG_SMP
178 * int bar;
179 * #endif
180 * };
181 *
182 * void func(struct foo *zoot)
183 * {
184 * WARN_ON_SMP(!zoot->bar);
185 *
186 * For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(),
187 * and should be a nop and return false for uniprocessor.
188 *
189 * if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set
190 * and x is true.
191 */
192#ifdef CONFIG_SMP
193# define WARN_ON_SMP(x) WARN_ON(x)
194#else
195/*
196 * Use of ({0;}) because WARN_ON_SMP(x) may be used either as
197 * a stand alone line statement or as a condition in an if ()
198 * statement.
199 * A simple "0" would cause gcc to give a "statement has no effect"
200 * warning.
201 */
202# define WARN_ON_SMP(x) ({0;})
203#endif
204
205#endif /* __ASSEMBLY__ */
206
207#endif