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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/asm-generic/bug.h
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)
84 /* used internally by panic.c */
87 void __warn(const char *file
, int line
, void *caller
, unsigned taint
,
88 struct pt_regs
*regs
, struct warn_args
*args
);
91 #define WARN_ON(condition) ({ \
92 int __ret_warn_on = !!(condition); \
93 if (unlikely(__ret_warn_on)) \
95 unlikely(__ret_warn_on); \
100 #define WARN(condition, format...) ({ \
101 int __ret_warn_on = !!(condition); \
102 if (unlikely(__ret_warn_on)) \
103 __WARN_printf(format); \
104 unlikely(__ret_warn_on); \
108 #define WARN_TAINT(condition, taint, format...) ({ \
109 int __ret_warn_on = !!(condition); \
110 if (unlikely(__ret_warn_on)) \
111 __WARN_printf_taint(taint, format); \
112 unlikely(__ret_warn_on); \
115 #define WARN_ON_ONCE(condition) ({ \
116 static bool __section(.data.unlikely) __warned; \
117 int __ret_warn_once = !!(condition); \
119 if (unlikely(__ret_warn_once && !__warned)) { \
123 unlikely(__ret_warn_once); \
126 #define WARN_ONCE(condition, format...) ({ \
127 static bool __section(.data.unlikely) __warned; \
128 int __ret_warn_once = !!(condition); \
130 if (unlikely(__ret_warn_once && !__warned)) { \
134 unlikely(__ret_warn_once); \
137 #define WARN_TAINT_ONCE(condition, taint, format...) ({ \
138 static bool __section(.data.unlikely) __warned; \
139 int __ret_warn_once = !!(condition); \
141 if (unlikely(__ret_warn_once && !__warned)) { \
143 WARN_TAINT(1, taint, format); \
145 unlikely(__ret_warn_once); \
148 #else /* !CONFIG_BUG */
149 #ifndef HAVE_ARCH_BUG
150 #define BUG() do {} while (1)
153 #ifndef HAVE_ARCH_BUG_ON
154 #define BUG_ON(condition) do { if (condition) BUG(); } while (0)
157 #ifndef HAVE_ARCH_WARN_ON
158 #define WARN_ON(condition) ({ \
159 int __ret_warn_on = !!(condition); \
160 unlikely(__ret_warn_on); \
165 #define WARN(condition, format...) ({ \
166 int __ret_warn_on = !!(condition); \
168 unlikely(__ret_warn_on); \
172 #define WARN_ON_ONCE(condition) WARN_ON(condition)
173 #define WARN_ONCE(condition, format...) WARN(condition, format)
174 #define WARN_TAINT(condition, taint, format...) WARN(condition, format)
175 #define WARN_TAINT_ONCE(condition, taint, format...) WARN(condition, format)
180 * WARN_ON_SMP() is for cases that the warning is either
181 * meaningless for !SMP or may even cause failures.
182 * This is usually used for cases that we have
183 * WARN_ON(!spin_is_locked(&lock)) checks, as spin_is_locked()
184 * returns 0 for uniprocessor settings.
185 * It can also be used with values that are only defined
195 * void func(struct foo *zoot)
197 * WARN_ON_SMP(!zoot->bar);
199 * For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(),
200 * and should be a nop and return false for uniprocessor.
202 * if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set
206 # define WARN_ON_SMP(x) WARN_ON(x)
209 * Use of ({0;}) because WARN_ON_SMP(x) may be used either as
210 * a stand alone line statement or as a condition in an if ()
212 * A simple "0" would cause gcc to give a "statement has no effect"
215 # define WARN_ON_SMP(x) ({0;})
218 #endif /* __ASSEMBLY__ */