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authorBen Hutchings <ben@decadent.org.uk>2010-04-03 19:34:56 +0100
committerDavid Woodhouse <David.Woodhouse@intel.com>2010-05-19 08:36:48 +0100
commitb2be05273a1744d175bf4b67f6665637bb9ac7a8 (patch)
treec0b6333fbc7a1834bfc0eec86dd204b1daacf1b4 /include/asm-generic
parent8954da1f82a468deeeae3683252b5440e7f4ccbe (diff)
panic: Allow warnings to set different taint flags
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>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/bug.h34
1 files changed, 32 insertions, 2 deletions
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 18c435d7c08..c2c9ba032d4 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -25,7 +25,10 @@ struct bug_entry {
};
#endif /* __ASSEMBLY__ */
-#define BUGFLAG_WARNING (1<<0)
+#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 */
/*
@@ -56,17 +59,25 @@ struct bug_entry {
* appear at runtime. Use the versions with printk format strings
* to provide better diagnostics.
*/
-#ifndef __WARN
+#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
@@ -87,6 +98,13 @@ extern void warn_slowpath_null(const char *file, const int line);
})
#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)
@@ -110,6 +128,8 @@ extern void warn_slowpath_null(const char *file, const int line);
})
#endif
+#define WARN_TAINT(condition, taint, format...) WARN_ON(condition)
+
#endif
#define WARN_ON_ONCE(condition) ({ \
@@ -132,6 +152,16 @@ extern void warn_slowpath_null(const char *file, const int line);
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))