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panic: Allow warnings to set different taint flags

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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>
This commit is contained in:
Ben Hutchings
2010-04-03 19:34:56 +01:00
committed by David Woodhouse
parent 8954da1f82
commit b2be05273a
8 changed files with 67 additions and 20 deletions
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24
kernel/panic.c
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@@ -365,7 +365,8 @@ struct slowpath_args {
va_list args;
};
static void warn_slowpath_common(const char *file, int line, void *caller, struct slowpath_args *args)
static void warn_slowpath_common(const char *file, int line, void *caller,
unsigned taint, struct slowpath_args *args)
{
const char *board;
@@ -381,7 +382,7 @@ static void warn_slowpath_common(const char *file, int line, void *caller, struc
print_modules();
dump_stack();
print_oops_end_marker();
add_taint(TAINT_WARN);
add_taint(taint);
}
void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
@@ -390,14 +391,29 @@ void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
args.fmt = fmt;
va_start(args.args, fmt);
warn_slowpath_common(file, line, __builtin_return_address(0), &args);
warn_slowpath_common(file, line, __builtin_return_address(0),
TAINT_WARN, &args);
va_end(args.args);
}
EXPORT_SYMBOL(warn_slowpath_fmt);
void warn_slowpath_fmt_taint(const char *file, int line,
unsigned taint, const char *fmt, ...)
{
struct slowpath_args args;
args.fmt = fmt;
va_start(args.args, fmt);
warn_slowpath_common(file, line, __builtin_return_address(0),
taint, &args);
va_end(args.args);
}
EXPORT_SYMBOL(warn_slowpath_fmt_taint);
void warn_slowpath_null(const char *file, int line)
{
warn_slowpath_common(file, line, __builtin_return_address(0), NULL);
warn_slowpath_common(file, line, __builtin_return_address(0),
TAINT_WARN, NULL);
}
EXPORT_SYMBOL(warn_slowpath_null);
#endif