projects/linux·blob v3.0 · refs

204 lines · 5.4 KiB

1#ifndef _ASM_GENERIC_BUG_H
2#define _ASM_GENERIC_BUG_H
3
4#include <linux/compiler.h>
5
6#ifdef CONFIG_BUG
7
8#ifdef CONFIG_GENERIC_BUG
9#ifndef __ASSEMBLY__
10struct bug_entry {
11#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
12 unsigned long bug_addr;
13#else
14 signed int bug_addr_disp;
15#endif
16#ifdef CONFIG_DEBUG_BUGVERBOSE
17#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
18 const char *file;
19#else
20 signed int file_disp;
21#endif
22 unsigned short line;
23#endif
24 unsigned short flags;
25};
26#endif /* __ASSEMBLY__ */
27
28#define BUGFLAG_WARNING (1 << 0)
29#define BUGFLAG_TAINT(taint) (BUGFLAG_WARNING | ((taint) << 8))
30#define BUG_GET_TAINT(bug) ((bug)->flags >> 8)
31
32#endif /* CONFIG_GENERIC_BUG */
33
34/*
35 * Don't use BUG() or BUG_ON() unless there's really no way out; one
36 * example might be detecting data structure corruption in the middle
37 * of an operation that can't be backed out of. If the (sub)system
38 * can somehow continue operating, perhaps with reduced functionality,
39 * it's probably not BUG-worthy.
40 *
41 * If you're tempted to BUG(), think again: is completely giving up
42 * really the *only* solution? There are usually better options, where
43 * users don't need to reboot ASAP and can mostly shut down cleanly.
44 */
45#ifndef HAVE_ARCH_BUG
46#define BUG() do { \
47 printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
48 panic("BUG!"); \
49} while (0)
50#endif
51
52#ifndef HAVE_ARCH_BUG_ON
53#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while(0)
54#endif
55
56/*
57 * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
58 * significant issues that need prompt attention if they should ever
59 * appear at runtime. Use the versions with printk format strings
60 * to provide better diagnostics.
61 */
62#ifndef __WARN_TAINT
63#ifndef __ASSEMBLY__
64extern void warn_slowpath_fmt(const char *file, const int line,
65 const char *fmt, ...) __attribute__((format(printf, 3, 4)));
66extern void warn_slowpath_fmt_taint(const char *file, const int line,
67 unsigned taint, const char *fmt, ...)
68 __attribute__((format(printf, 4, 5)));
69extern void warn_slowpath_null(const char *file, const int line);
70#define WANT_WARN_ON_SLOWPATH
71#endif
72#define __WARN() warn_slowpath_null(__FILE__, __LINE__)
73#define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg)
74#define __WARN_printf_taint(taint, arg...) \
75 warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg)
76#else
77#define __WARN() __WARN_TAINT(TAINT_WARN)
78#define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0)
79#define __WARN_printf_taint(taint, arg...) \
80 do { printk(arg); __WARN_TAINT(taint); } while (0)
81#endif
82
83#ifndef WARN_ON
84#define WARN_ON(condition) ({ \
85 int __ret_warn_on = !!(condition); \
86 if (unlikely(__ret_warn_on)) \
87 __WARN(); \
88 unlikely(__ret_warn_on); \
89})
90#endif
91
92#ifndef WARN
93#define WARN(condition, format...) ({ \
94 int __ret_warn_on = !!(condition); \
95 if (unlikely(__ret_warn_on)) \
96 __WARN_printf(format); \
97 unlikely(__ret_warn_on); \
98})
99#endif
100
101#define WARN_TAINT(condition, taint, format...) ({ \
102 int __ret_warn_on = !!(condition); \
103 if (unlikely(__ret_warn_on)) \
104 __WARN_printf_taint(taint, format); \
105 unlikely(__ret_warn_on); \
106})
107
108#else /* !CONFIG_BUG */
109#ifndef HAVE_ARCH_BUG
110#define BUG() do {} while(0)
111#endif
112
113#ifndef HAVE_ARCH_BUG_ON
114#define BUG_ON(condition) do { if (condition) ; } while(0)
115#endif
116
117#ifndef HAVE_ARCH_WARN_ON
118#define WARN_ON(condition) ({ \
119 int __ret_warn_on = !!(condition); \
120 unlikely(__ret_warn_on); \
121})
122#endif
123
124#ifndef WARN
125#define WARN(condition, format...) ({ \
126 int __ret_warn_on = !!(condition); \
127 unlikely(__ret_warn_on); \
128})
129#endif
130
131#define WARN_TAINT(condition, taint, format...) WARN_ON(condition)
132
133#endif
134
135#define WARN_ON_ONCE(condition) ({ \
136 static bool __warned; \
137 int __ret_warn_once = !!(condition); \
138 \
139 if (unlikely(__ret_warn_once)) \
140 if (WARN_ON(!__warned)) \
141 __warned = true; \
142 unlikely(__ret_warn_once); \
143})
144
145#define WARN_ONCE(condition, format...) ({ \
146 static bool __warned; \
147 int __ret_warn_once = !!(condition); \
148 \
149 if (unlikely(__ret_warn_once)) \
150 if (WARN(!__warned, format)) \
151 __warned = true; \
152 unlikely(__ret_warn_once); \
153})
154
155#define WARN_TAINT_ONCE(condition, taint, format...) ({ \
156 static bool __warned; \
157 int __ret_warn_once = !!(condition); \
158 \
159 if (unlikely(__ret_warn_once)) \
160 if (WARN_TAINT(!__warned, taint, format)) \
161 __warned = true; \
162 unlikely(__ret_warn_once); \
163})
164
165/*
166 * WARN_ON_SMP() is for cases that the warning is either
167 * meaningless for !SMP or may even cause failures.
168 * This is usually used for cases that we have
169 * WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked()
170 * returns 0 for uniprocessor settings.
171 * It can also be used with values that are only defined
172 * on SMP:
173 *
174 * struct foo {
175 * [...]
176 * #ifdef CONFIG_SMP
177 * int bar;
178 * #endif
179 * };
180 *
181 * void func(struct foo *zoot)
182 * {
183 * WARN_ON_SMP(!zoot->bar);
184 *
185 * For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(),
186 * and should be a nop and return false for uniprocessor.
187 *
188 * if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set
189 * and x is true.
190 */
191#ifdef CONFIG_SMP
192# define WARN_ON_SMP(x) WARN_ON(x)
193#else
194/*
195 * Use of ({0;}) because WARN_ON_SMP(x) may be used either as
196 * a stand alone line statement or as a condition in an if ()
197 * statement.
198 * A simple "0" would cause gcc to give a "statement has no effect"
199 * warning.
200 */
201# define WARN_ON_SMP(x) ({0;})
202#endif
203
204#endif