mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 17:12:06 +00:00
b2be05273a
WARN() is used in some places to report firmware or hardware bugs that are then worked-around. These bugs do not affect the stability of the kernel and should not set the flag for TAINT_WARN. To allow for this, add WARN_TAINT() and WARN_TAINT_ONCE() macros that take a taint number as argument. Architectures that implement warnings using trap instructions instead of calls to warn_slowpath_*() now implement __WARN_TAINT(taint) instead of __WARN(). Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Acked-by: Helge Deller <deller@gmx.de> Tested-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
175 lines
4.6 KiB
C
175 lines
4.6 KiB
C
#ifndef _ASM_GENERIC_BUG_H
|
|
#define _ASM_GENERIC_BUG_H
|
|
|
|
#include <linux/compiler.h>
|
|
|
|
#ifdef CONFIG_BUG
|
|
|
|
#ifdef CONFIG_GENERIC_BUG
|
|
#ifndef __ASSEMBLY__
|
|
struct bug_entry {
|
|
#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
|
|
unsigned long bug_addr;
|
|
#else
|
|
signed int bug_addr_disp;
|
|
#endif
|
|
#ifdef CONFIG_DEBUG_BUGVERBOSE
|
|
#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
|
|
const char *file;
|
|
#else
|
|
signed int file_disp;
|
|
#endif
|
|
unsigned short line;
|
|
#endif
|
|
unsigned short flags;
|
|
};
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#define BUGFLAG_WARNING (1 << 0)
|
|
#define BUGFLAG_TAINT(taint) (BUGFLAG_WARNING | ((taint) << 8))
|
|
#define BUG_GET_TAINT(bug) ((bug)->flags >> 8)
|
|
|
|
#endif /* CONFIG_GENERIC_BUG */
|
|
|
|
/*
|
|
* Don't use BUG() or BUG_ON() unless there's really no way out; one
|
|
* example might be detecting data structure corruption in the middle
|
|
* of an operation that can't be backed out of. If the (sub)system
|
|
* can somehow continue operating, perhaps with reduced functionality,
|
|
* it's probably not BUG-worthy.
|
|
*
|
|
* If you're tempted to BUG(), think again: is completely giving up
|
|
* really the *only* solution? There are usually better options, where
|
|
* users don't need to reboot ASAP and can mostly shut down cleanly.
|
|
*/
|
|
#ifndef HAVE_ARCH_BUG
|
|
#define BUG() do { \
|
|
printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
|
|
panic("BUG!"); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#ifndef HAVE_ARCH_BUG_ON
|
|
#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while(0)
|
|
#endif
|
|
|
|
/*
|
|
* WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
|
|
* significant issues that need prompt attention if they should ever
|
|
* appear at runtime. Use the versions with printk format strings
|
|
* to provide better diagnostics.
|
|
*/
|
|
#ifndef __WARN_TAINT
|
|
#ifndef __ASSEMBLY__
|
|
extern void warn_slowpath_fmt(const char *file, const int line,
|
|
const char *fmt, ...) __attribute__((format(printf, 3, 4)));
|
|
extern void warn_slowpath_fmt_taint(const char *file, const int line,
|
|
unsigned taint, const char *fmt, ...)
|
|
__attribute__((format(printf, 4, 5)));
|
|
extern void warn_slowpath_null(const char *file, const int line);
|
|
#define WANT_WARN_ON_SLOWPATH
|
|
#endif
|
|
#define __WARN() warn_slowpath_null(__FILE__, __LINE__)
|
|
#define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg)
|
|
#define __WARN_printf_taint(taint, arg...) \
|
|
warn_slowpath_fmt_taint(__FILE__, __LINE__, taint, arg)
|
|
#else
|
|
#define __WARN() __WARN_TAINT(TAINT_WARN)
|
|
#define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0)
|
|
#define __WARN_printf_taint(taint, arg...) \
|
|
do { printk(arg); __WARN_TAINT(taint); } while (0)
|
|
#endif
|
|
|
|
#ifndef WARN_ON
|
|
#define WARN_ON(condition) ({ \
|
|
int __ret_warn_on = !!(condition); \
|
|
if (unlikely(__ret_warn_on)) \
|
|
__WARN(); \
|
|
unlikely(__ret_warn_on); \
|
|
})
|
|
#endif
|
|
|
|
#ifndef WARN
|
|
#define WARN(condition, format...) ({ \
|
|
int __ret_warn_on = !!(condition); \
|
|
if (unlikely(__ret_warn_on)) \
|
|
__WARN_printf(format); \
|
|
unlikely(__ret_warn_on); \
|
|
})
|
|
#endif
|
|
|
|
#define WARN_TAINT(condition, taint, format...) ({ \
|
|
int __ret_warn_on = !!(condition); \
|
|
if (unlikely(__ret_warn_on)) \
|
|
__WARN_printf_taint(taint, format); \
|
|
unlikely(__ret_warn_on); \
|
|
})
|
|
|
|
#else /* !CONFIG_BUG */
|
|
#ifndef HAVE_ARCH_BUG
|
|
#define BUG() do {} while(0)
|
|
#endif
|
|
|
|
#ifndef HAVE_ARCH_BUG_ON
|
|
#define BUG_ON(condition) do { if (condition) ; } while(0)
|
|
#endif
|
|
|
|
#ifndef HAVE_ARCH_WARN_ON
|
|
#define WARN_ON(condition) ({ \
|
|
int __ret_warn_on = !!(condition); \
|
|
unlikely(__ret_warn_on); \
|
|
})
|
|
#endif
|
|
|
|
#ifndef WARN
|
|
#define WARN(condition, format...) ({ \
|
|
int __ret_warn_on = !!(condition); \
|
|
unlikely(__ret_warn_on); \
|
|
})
|
|
#endif
|
|
|
|
#define WARN_TAINT(condition, taint, format...) WARN_ON(condition)
|
|
|
|
#endif
|
|
|
|
#define WARN_ON_ONCE(condition) ({ \
|
|
static bool __warned; \
|
|
int __ret_warn_once = !!(condition); \
|
|
\
|
|
if (unlikely(__ret_warn_once)) \
|
|
if (WARN_ON(!__warned)) \
|
|
__warned = true; \
|
|
unlikely(__ret_warn_once); \
|
|
})
|
|
|
|
#define WARN_ONCE(condition, format...) ({ \
|
|
static bool __warned; \
|
|
int __ret_warn_once = !!(condition); \
|
|
\
|
|
if (unlikely(__ret_warn_once)) \
|
|
if (WARN(!__warned, format)) \
|
|
__warned = true; \
|
|
unlikely(__ret_warn_once); \
|
|
})
|
|
|
|
#define WARN_TAINT_ONCE(condition, taint, format...) ({ \
|
|
static bool __warned; \
|
|
int __ret_warn_once = !!(condition); \
|
|
\
|
|
if (unlikely(__ret_warn_once)) \
|
|
if (WARN_TAINT(!__warned, taint, format)) \
|
|
__warned = true; \
|
|
unlikely(__ret_warn_once); \
|
|
})
|
|
|
|
#define WARN_ON_RATELIMIT(condition, state) \
|
|
WARN_ON((condition) && __ratelimit(state))
|
|
|
|
#ifdef CONFIG_SMP
|
|
# define WARN_ON_SMP(x) WARN_ON(x)
|
|
#else
|
|
# define WARN_ON_SMP(x) do { } while (0)
|
|
#endif
|
|
|
|
#endif
|