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Subject[patch 2/17] Add a WARN() macro that acts like WARN_ON()+printk
From: Arjan van de Ven <arjan@linux.intel.com>

Add a WARN() macro that acts like WARN_ON(), with the added feature that it
takes a printk like argument that is printed as part of the warning message.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/asm-generic/bug.h | 32 ++++++++++++++++++++++++++++++++
kernel/panic.c | 22 ++++++++++++++++++++++
2 files changed, 54 insertions(+)
Index: linux.trees.git/include/asm-generic/bug.h
===================================================================
--- linux.trees.git.orig/include/asm-generic/bug.h
+++ linux.trees.git/include/asm-generic/bug.h
@@ -34,9 +34,14 @@ struct bug_entry {
#ifndef __WARN
#ifndef __ASSEMBLY__
extern void warn_on_slowpath(const char *file, const int line);
+extern void warn_slowpath(const char *file, const int line,
+ const char *fmt, ...) __attribute__((format(printf, 3, 4)));
#define WANT_WARN_ON_SLOWPATH
#endif
#define __WARN() warn_on_slowpath(__FILE__, __LINE__)
+#define __WARN_printf(arg...) warn_slowpath(__FILE__, __LINE__, arg)
+#else
+#define __WARN_printf(arg...) __WARN()
#endif

#ifndef WARN_ON
@@ -48,6 +53,15 @@ extern void warn_on_slowpath(const char
})
#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
+
#else /* !CONFIG_BUG */
#ifndef HAVE_ARCH_BUG
#define BUG()
@@ -63,6 +77,14 @@ extern void warn_on_slowpath(const char
unlikely(__ret_warn_on); \
})
#endif
+
+#ifndef WARN
+#define WARN(condition, format...) ({ \
+ int __ret_warn_on = !!(condition); \
+ unlikely(__ret_warn_on); \
+})
+#endif
+
#endif

#define WARN_ON_ONCE(condition) ({ \
@@ -75,6 +97,16 @@ extern void warn_on_slowpath(const char
unlikely(__ret_warn_once); \
})

+#define WARN_ONCE(condition, format...) ({ \
+ static int __warned; \
+ int __ret_warn_once = !!(condition); \
+ \
+ if (unlikely(__ret_warn_once)) \
+ if (WARN(!__warned, format)) \
+ __warned = 1; \
+ unlikely(__ret_warn_once); \
+})
+
#ifdef CONFIG_SMP
# define WARN_ON_SMP(x) WARN_ON(x)
#else
Index: linux.trees.git/kernel/panic.c
===================================================================
--- linux.trees.git.orig/kernel/panic.c
+++ linux.trees.git/kernel/panic.c
@@ -321,6 +321,28 @@ void warn_on_slowpath(const char *file,
add_taint(TAINT_WARN);
}
EXPORT_SYMBOL(warn_on_slowpath);
+
+
+void warn_slowpath(const char *file, int line, const char *fmt, ...)
+{
+ va_list args;
+ char function[KSYM_SYMBOL_LEN];
+ unsigned long caller = (unsigned long)__builtin_return_address(0);
+ sprint_symbol(function, caller);
+
+ printk(KERN_WARNING "------------[ cut here ]------------\n");
+ printk(KERN_WARNING "WARNING: at %s:%d %s()\n", file,
+ line, function);
+ va_start(args, fmt);
+ vprintk(fmt, args);
+ va_end(args);
+
+ print_modules();
+ dump_stack();
+ print_oops_end_marker();
+ add_taint(TAINT_WARN);
+}
+EXPORT_SYMBOL(warn_slowpath);
#endif

#ifdef CONFIG_CC_STACKPROTECTOR

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