Merge branches 'topic/asoc', 'topic/misc-fixes' and 'topic/hda' into for-linus

[linux-2.6-omap-h63xx.git] / kernel / panic.c

diff --git a/kernel/panic.c b/kernel/panic.c
index da4d6bac270e90dcdc0dfc6052dbb49f935cc981..bda561ef3cdf4e3f7f091fc6f4f215fe4b785b16 100644 (file)
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -20,9 +20,10 @@
 #include <linux/kexec.h>
 #include <linux/debug_locks.h>
 #include <linux/random.h>
+#include <linux/kallsyms.h>
 
 int panic_on_oops;
-int tainted;
+static unsigned long tainted_mask;
 static int pause_on_oops;
 static int pause_on_oops_flag;
 static DEFINE_SPINLOCK(pause_on_oops_lock);
@@ -142,6 +143,27 @@ NORET_TYPE void panic(const char * fmt, ...)
 
 EXPORT_SYMBOL(panic);
 
+
+struct tnt {
+       u8 bit;
+       char true;
+       char false;
+};
+
+static const struct tnt tnts[] = {
+       { TAINT_PROPRIETARY_MODULE, 'P', 'G' },
+       { TAINT_FORCED_MODULE, 'F', ' ' },
+       { TAINT_UNSAFE_SMP, 'S', ' ' },
+       { TAINT_FORCED_RMMOD, 'R', ' ' },
+       { TAINT_MACHINE_CHECK, 'M', ' ' },
+       { TAINT_BAD_PAGE, 'B', ' ' },
+       { TAINT_USER, 'U', ' ' },
+       { TAINT_DIE, 'D', ' ' },
+       { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
+       { TAINT_WARN, 'W', ' ' },
+       { TAINT_CRAP, 'C', ' ' },
+};
+
 /**
  *     print_tainted - return a string to represent the kernel taint state.
  *
@@ -152,33 +174,47 @@ EXPORT_SYMBOL(panic);
  *  'M' - System experienced a machine check exception.
  *  'B' - System has hit bad_page.
  *  'U' - Userspace-defined naughtiness.
+ *  'A' - ACPI table overridden.
+ *  'W' - Taint on warning.
+ *  'C' - modules from drivers/staging are loaded.
  *
  *     The string is overwritten by the next call to print_taint().
  */
-
 const char *print_tainted(void)
 {
-       static char buf[20];
-       if (tainted) {
-               snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c",
-                       tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
-                       tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
-                       tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
-                       tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
-                       tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
-                       tainted & TAINT_BAD_PAGE ? 'B' : ' ',
-                       tainted & TAINT_USER ? 'U' : ' ',
-                       tainted & TAINT_DIE ? 'D' : ' ');
-       }
-       else
+       static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ") + 1];
+
+       if (tainted_mask) {
+               char *s;
+               int i;
+
+               s = buf + sprintf(buf, "Tainted: ");
+               for (i = 0; i < ARRAY_SIZE(tnts); i++) {
+                       const struct tnt *t = &tnts[i];
+                       *s++ = test_bit(t->bit, &tainted_mask) ?
+                                       t->true : t->false;
+               }
+               *s = 0;
+       } else
                snprintf(buf, sizeof(buf), "Not tainted");
        return(buf);
 }
 
+int test_taint(unsigned flag)
+{
+       return test_bit(flag, &tainted_mask);
+}
+EXPORT_SYMBOL(test_taint);
+
+unsigned long get_taint(void)
+{
+       return tainted_mask;
+}
+
 void add_taint(unsigned flag)
 {
        debug_locks = 0; /* can't trust the integrity of the kernel anymore */
-       tainted |= flag;
+       set_bit(flag, &tainted_mask);
 }
 EXPORT_SYMBOL(add_taint);
 
@@ -280,6 +316,13 @@ static int init_oops_id(void)
 }
 late_initcall(init_oops_id);
 
+static void print_oops_end_marker(void)
+{
+       init_oops_id();
+       printk(KERN_WARNING "---[ end trace %016llx ]---\n",
+               (unsigned long long)oops_id);
+}
+
 /*
  * Called when the architecture exits its oops handler, after printing
  * everything.
@@ -287,10 +330,48 @@ late_initcall(init_oops_id);
 void oops_exit(void)
 {
        do_oops_enter_exit();
-       init_oops_id();
-       printk(KERN_WARNING "---[ end trace %016llx ]---\n",
-               (unsigned long long)oops_id);
+       print_oops_end_marker();
+}
+
+#ifdef WANT_WARN_ON_SLOWPATH
+void warn_on_slowpath(const char *file, int line)
+{
+       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);
+       print_modules();
+       dump_stack();
+       print_oops_end_marker();
+       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
 /*