1 files changed, 47 insertions, 18 deletions

diff --git a/kernel/panic.c b/kernel/panic.c
index 12c5a0a6c89b..f290e8e866f6 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -23,7 +23,7 @@
 #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);
@@ -143,6 +143,26 @@ 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', ' ' },
+};
+
 /**
  *      print_tainted - return a string to represent the kernel taint state.
  *
@@ -158,32 +178,41 @@ EXPORT_SYMBOL(panic);
  *
  *      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);
 }
 
+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);