1 files changed, 65 insertions, 52 deletions

diff --git a/kernel/panic.c b/kernel/panic.c
index e0a87bb025c0..3a0b0898690a 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -21,9 +21,10 @@
 #include <linux/debug_locks.h>
 #include <linux/random.h>
 #include <linux/kallsyms.h>
+#include <linux/dmi.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);
@@ -34,13 +35,6 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
 
 EXPORT_SYMBOL(panic_notifier_list);
 
-static int __init panic_setup(char *str)
-{
-        panic_timeout = simple_strtoul(str, NULL, 0);
-        return 1;
-}
-__setup("panic=", panic_setup);
-
 static long no_blink(long time)
 {
         return 0;
@@ -146,6 +140,27 @@ 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.
  *
@@ -156,46 +171,50 @@ EXPORT_SYMBOL(panic);
  *  'M' - System experienced a machine check exception.
  *  'B' - System has hit bad_page.
  *  'U' - Userspace-defined naughtiness.
+ *  'D' - Kernel has oopsed before
  *  '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%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' : ' ',
-                        tainted & TAINT_OVERRIDDEN_ACPI_TABLE ? 'A' : ' ',
-                        tainted & TAINT_WARN ? 'W' : ' ');
-        }
-        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);
 }
 
-void add_taint(unsigned flag)
+int test_taint(unsigned flag)
 {
-        debug_locks = 0; /* can't trust the integrity of the kernel anymore */
-        tainted |= flag;
+        return test_bit(flag, &tainted_mask);
+}
+EXPORT_SYMBOL(test_taint);
+
+unsigned long get_taint(void)
+{
+        return tainted_mask;
 }
-EXPORT_SYMBOL(add_taint);
 
-static int __init pause_on_oops_setup(char *str)
+void add_taint(unsigned flag)
 {
-        pause_on_oops = simple_strtoul(str, NULL, 0);
-        return 1;
+        debug_locks = 0; /* can't trust the integrity of the kernel anymore */
+        set_bit(flag, &tainted_mask);
 }
-__setup("pause_on_oops=", pause_on_oops_setup);
+EXPORT_SYMBOL(add_taint);
 
 static void spin_msec(int msecs)
 {
@@ -306,36 +325,27 @@ void oops_exit(void)
 }
 
 #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);
+        const char *board;
+
         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);
+        board = dmi_get_system_info(DMI_PRODUCT_NAME);
+        if (board)
+                printk(KERN_WARNING "Hardware name: %s\n", board);
+
+        if (fmt) {
+                va_start(args, fmt);
+                vprintk(fmt, args);
+                va_end(args);
+        }
 
         print_modules();
         dump_stack();
@@ -363,3 +373,6 @@ void __stack_chk_fail(void)
 EXPORT_SYMBOL(__stack_chk_fail);
 
 #endif
+
+core_param(panic, panic_timeout, int, 0644);
+core_param(pause_on_oops, pause_on_oops, int, 0644);