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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _ASM_GENERIC_BUG_H
2#define _ASM_GENERIC_BUG_H
3
4#include <linux/compiler.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005
Matt Mackallc8538a72005-05-01 08:59:01 -07006#ifdef CONFIG_BUG
Jeremy Fitzhardinge7664c5a2006-12-08 02:36:19 -08007
8#ifdef CONFIG_GENERIC_BUG
9#ifndef __ASSEMBLY__
10struct bug_entry {
Jan Beulichb93a5312008-12-16 11:40:27 +000011#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
Jeremy Fitzhardinge7664c5a2006-12-08 02:36:19 -080012 unsigned long bug_addr;
Jan Beulichb93a5312008-12-16 11:40:27 +000013#else
14 signed int bug_addr_disp;
15#endif
Jeremy Fitzhardinge7664c5a2006-12-08 02:36:19 -080016#ifdef CONFIG_DEBUG_BUGVERBOSE
Jan Beulichb93a5312008-12-16 11:40:27 +000017#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
Jeremy Fitzhardinge7664c5a2006-12-08 02:36:19 -080018 const char *file;
Jan Beulichb93a5312008-12-16 11:40:27 +000019#else
20 signed int file_disp;
21#endif
Jeremy Fitzhardinge7664c5a2006-12-08 02:36:19 -080022 unsigned short line;
23#endif
24 unsigned short flags;
25};
26#endif /* __ASSEMBLY__ */
27
28#define BUGFLAG_WARNING (1<<0)
29#endif /* CONFIG_GENERIC_BUG */
30
David Brownellaf9379c2009-01-06 14:41:01 -080031/*
32 * Don't use BUG() or BUG_ON() unless there's really no way out; one
33 * example might be detecting data structure corruption in the middle
34 * of an operation that can't be backed out of. If the (sub)system
35 * can somehow continue operating, perhaps with reduced functionality,
36 * it's probably not BUG-worthy.
37 *
38 * If you're tempted to BUG(), think again: is completely giving up
39 * really the *only* solution? There are usually better options, where
40 * users don't need to reboot ASAP and can mostly shut down cleanly.
41 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#ifndef HAVE_ARCH_BUG
43#define BUG() do { \
Harvey Harrisond5c003b2008-10-15 22:01:24 -070044 printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 panic("BUG!"); \
46} while (0)
47#endif
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#ifndef HAVE_ARCH_BUG_ON
Alexey Dobriyan2a41de42007-07-17 04:03:56 -070050#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while(0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#endif
52
David Brownellaf9379c2009-01-06 14:41:01 -080053/*
54 * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
55 * significant issues that need prompt attention if they should ever
56 * appear at runtime. Use the versions with printk format strings
57 * to provide better diagnostics.
58 */
Olof Johansson3a6a62f92008-01-30 13:32:50 +010059#ifndef __WARN
Arjan van de Ven79b4cc52008-01-30 13:32:50 +010060#ifndef __ASSEMBLY__
Andi Kleen57adc4d2009-05-06 16:02:53 -070061extern void warn_slowpath_fmt(const char *file, const int line,
Arjan van de Vena8f18b92008-07-25 01:45:53 -070062 const char *fmt, ...) __attribute__((format(printf, 3, 4)));
Andi Kleen57adc4d2009-05-06 16:02:53 -070063extern void warn_slowpath_null(const char *file, const int line);
Arjan van de Ven79b4cc52008-01-30 13:32:50 +010064#define WANT_WARN_ON_SLOWPATH
65#endif
Andi Kleen57adc4d2009-05-06 16:02:53 -070066#define __WARN() warn_slowpath_null(__FILE__, __LINE__)
67#define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg)
Arjan van de Vena8f18b92008-07-25 01:45:53 -070068#else
Ingo Molnarec5679e2008-11-28 17:56:14 +010069#define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0)
Olof Johansson3a6a62f92008-01-30 13:32:50 +010070#endif
71
72#ifndef WARN_ON
Herbert Xu684f9782006-09-29 01:59:06 -070073#define WARN_ON(condition) ({ \
Linus Torvalds8d4fbcf2007-07-31 21:12:07 -070074 int __ret_warn_on = !!(condition); \
Olof Johansson3a6a62f92008-01-30 13:32:50 +010075 if (unlikely(__ret_warn_on)) \
76 __WARN(); \
Herbert Xu684f9782006-09-29 01:59:06 -070077 unlikely(__ret_warn_on); \
78})
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#endif
80
Arjan van de Vena8f18b92008-07-25 01:45:53 -070081#ifndef WARN
82#define WARN(condition, format...) ({ \
83 int __ret_warn_on = !!(condition); \
84 if (unlikely(__ret_warn_on)) \
85 __WARN_printf(format); \
86 unlikely(__ret_warn_on); \
87})
88#endif
89
Matt Mackallc8538a72005-05-01 08:59:01 -070090#else /* !CONFIG_BUG */
91#ifndef HAVE_ARCH_BUG
David Howellsda606822009-04-15 19:34:56 +010092#define BUG() do {} while(0)
Matt Mackallc8538a72005-05-01 08:59:01 -070093#endif
94
Matt Mackallc8538a72005-05-01 08:59:01 -070095#ifndef HAVE_ARCH_BUG_ON
96#define BUG_ON(condition) do { if (condition) ; } while(0)
97#endif
98
99#ifndef HAVE_ARCH_WARN_ON
Ralf Baechle8c7c7c92006-10-19 23:28:34 -0700100#define WARN_ON(condition) ({ \
Linus Torvalds8d4fbcf2007-07-31 21:12:07 -0700101 int __ret_warn_on = !!(condition); \
Ralf Baechle8c7c7c92006-10-19 23:28:34 -0700102 unlikely(__ret_warn_on); \
103})
Matt Mackallc8538a72005-05-01 08:59:01 -0700104#endif
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700105
106#ifndef WARN
107#define WARN(condition, format...) ({ \
108 int __ret_warn_on = !!(condition); \
109 unlikely(__ret_warn_on); \
110})
111#endif
112
Matt Mackallc8538a72005-05-01 08:59:01 -0700113#endif
114
Andrew Mortond69a8922006-10-06 00:43:49 -0700115#define WARN_ON_ONCE(condition) ({ \
116 static int __warned; \
Linus Torvalds8d4fbcf2007-07-31 21:12:07 -0700117 int __ret_warn_once = !!(condition); \
Andrew Mortond69a8922006-10-06 00:43:49 -0700118 \
119 if (unlikely(__ret_warn_once)) \
120 if (WARN_ON(!__warned)) \
121 __warned = 1; \
122 unlikely(__ret_warn_once); \
Ingo Molnar74bb6a02006-06-25 05:48:09 -0700123})
124
Arjan van de Ven45e9c0d2008-09-15 16:43:18 -0700125#define WARN_ONCE(condition, format...) ({ \
126 static int __warned; \
127 int __ret_warn_once = !!(condition); \
128 \
129 if (unlikely(__ret_warn_once)) \
130 if (WARN(!__warned, format)) \
131 __warned = 1; \
132 unlikely(__ret_warn_once); \
133})
134
Dave Young717115e2008-07-25 01:45:58 -0700135#define WARN_ON_RATELIMIT(condition, state) \
136 WARN_ON((condition) && __ratelimit(state))
137
Ingo Molnar8eb94f82006-06-27 02:54:50 -0700138#ifdef CONFIG_SMP
139# define WARN_ON_SMP(x) WARN_ON(x)
140#else
141# define WARN_ON_SMP(x) do { } while (0)
142#endif
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144#endif