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Add a WARN() macro; this is WARN_ON() + printk arguments
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. [akpm@linux-foundation.org: fix printk arguments] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Cc: Greg KH <greg@kroah.com> Cc: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -34,9 +34,14 @@ struct bug_entry {
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#ifndef __WARN
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#ifndef __ASSEMBLY__
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extern void warn_on_slowpath(const char *file, const int line);
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extern void warn_slowpath(const char *file, const int line,
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const char *fmt, ...) __attribute__((format(printf, 3, 4)));
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#define WANT_WARN_ON_SLOWPATH
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#endif
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#define __WARN() warn_on_slowpath(__FILE__, __LINE__)
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#define __WARN_printf(arg...) warn_slowpath(__FILE__, __LINE__, arg)
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#else
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#define __WARN_printf(arg...) __WARN()
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#endif
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#ifndef WARN_ON
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@ -48,6 +53,15 @@ extern void warn_on_slowpath(const char *file, const int line);
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})
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#endif
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#ifndef WARN
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#define WARN(condition, format...) ({ \
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int __ret_warn_on = !!(condition); \
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if (unlikely(__ret_warn_on)) \
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__WARN_printf(format); \
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unlikely(__ret_warn_on); \
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})
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#endif
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#else /* !CONFIG_BUG */
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#ifndef HAVE_ARCH_BUG
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#define BUG()
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@ -63,6 +77,14 @@ extern void warn_on_slowpath(const char *file, const int line);
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unlikely(__ret_warn_on); \
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})
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#endif
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#ifndef WARN
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#define WARN(condition, format...) ({ \
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int __ret_warn_on = !!(condition); \
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unlikely(__ret_warn_on); \
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})
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#endif
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#endif
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#define WARN_ON_ONCE(condition) ({ \
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@ -318,6 +318,28 @@ void warn_on_slowpath(const char *file, int line)
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add_taint(TAINT_WARN);
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}
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EXPORT_SYMBOL(warn_on_slowpath);
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void warn_slowpath(const char *file, int line, const char *fmt, ...)
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{
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va_list args;
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char function[KSYM_SYMBOL_LEN];
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unsigned long caller = (unsigned long)__builtin_return_address(0);
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sprint_symbol(function, caller);
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printk(KERN_WARNING "------------[ cut here ]------------\n");
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printk(KERN_WARNING "WARNING: at %s:%d %s()\n", file,
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line, function);
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va_start(args, fmt);
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vprintk(fmt, args);
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va_end(args);
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print_modules();
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dump_stack();
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print_oops_end_marker();
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add_taint(TAINT_WARN);
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}
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EXPORT_SYMBOL(warn_slowpath);
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#endif
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#ifdef CONFIG_CC_STACKPROTECTOR
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