lib/atomic64_test.c: convert printk(KERN_INFO to pr_info

Convert printk to current pr_foo() logging functions.

Also add pr_fmt based on KBUILD_MODNAME to avoid repeating prefix. Prefix
is now "atomic64_test: "

Signed-off-by: Fabian Frederick <[e-mail]>
Cc: Luca Barbieri <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

lib/atomic64_test.c

···
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/init.h>
 #include <linux/bug.h>
 #include <linux/kernel.h>
···
 	BUG_ON(v.counter != r);
 
 #ifdef CONFIG_X86
-	printk(KERN_INFO "atomic64 test passed for %s platform %s CX8 and %s SSE\n",
+	pr_info("passed for %s platform %s CX8 and %s SSE\n",
 #ifdef CONFIG_X86_64
-	       "x86-64",
+		"x86-64",
 #elif defined(CONFIG_X86_CMPXCHG64)
-	       "i586+",
+		"i586+",
 #else
-	       "i386+",
+		"i386+",
 #endif
 	       boot_cpu_has(X86_FEATURE_CX8) ? "with" : "without",
 	       boot_cpu_has(X86_FEATURE_XMM) ? "with" : "without");
 #else
-	printk(KERN_INFO "atomic64 test passed\n");
+	pr_info("passed\n");
 #endif
 
 	return 0;