extract and use FILE_LINE macro

Extract nifty FILE_LINE useful for printk style debugging:

	printk("%s\n", FILE_LINE);

It should not be used en mass probably because __FILE__ string literals
can be merged while FILE_LINE's won't. But for debugging it is what
the doctor ordered.

Don't add leading and trailing underscores, they're painful to type. 
Trust me, I've tried both versions.

Link: https://lkml.kernel.org/r/ebf12ac4-5a61-4b12-b8b0-1253eb371332@p183


Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/fortify-string.h

@@ -643,7 +643,7 @@ __FORTIFY_INLINE bool fortify_memcpy_chk(__kernel_size_t size,
 				     __q_size_field, #op),		\
 		  #op ": detected field-spanning write (size %zu) of single %s (size %zu)\n", \
 		  __fortify_size,					\
-		  "field \"" #p "\" at " __FILE__ ":" __stringify(__LINE__), \
+		  "field \"" #p "\" at " FILE_LINE,			\
 		  __p_size_field);					\
 	__underlying_##op(p, q, __fortify_size);			\
 })

include/linux/stringify.h

@@ -9,4 +9,6 @@
 #define __stringify_1(x...)	#x
 #define __stringify(x...)	__stringify_1(x)
 
+#define FILE_LINE	__FILE__ ":" __stringify(__LINE__)
+
 #endif	/* !__LINUX_STRINGIFY_H */

include/linux/timer.h

@@ -77,8 +77,7 @@ struct timer_list {
 		.entry = { .next = TIMER_ENTRY_STATIC },	\
 		.function = (_function),			\
 		.flags = (_flags),				\
-		__TIMER_LOCKDEP_MAP_INITIALIZER(		\
-			__FILE__ ":" __stringify(__LINE__))	\
+		__TIMER_LOCKDEP_MAP_INITIALIZER(FILE_LINE)	\
 	}
 
 #define DEFINE_TIMER(_name, _function)				\

sound/pci/asihpi/hpidebug.h

@@ -29,16 +29,15 @@ enum { HPI_DEBUG_LEVEL_ERROR = 0,	/* always log errors */
    the start of each message, eg see linux kernel hpios.h */
 
 #ifdef SOURCEFILE_NAME
+#undef FILE_LINE
 #define FILE_LINE  SOURCEFILE_NAME ":" __stringify(__LINE__) " "
-#else
-#define FILE_LINE  __FILE__ ":" __stringify(__LINE__) " "
 #endif
 
 #define HPI_DEBUG_ASSERT(expression) \
 	do { \
 		if (!(expression)) { \
 			printk(KERN_ERR  FILE_LINE \
-				"ASSERT " __stringify(expression)); \
+				" ASSERT " __stringify(expression)); \
 		} \
 	} while (0)
 
@@ -46,7 +45,7 @@ enum { HPI_DEBUG_LEVEL_ERROR = 0,	/* always log errors */
 	do { \
 		if (hpi_debug_level >= HPI_DEBUG_LEVEL_##level) { \
 			printk(HPI_DEBUG_FLAG_##level \
-			FILE_LINE  __VA_ARGS__); \
+			FILE_LINE " " __VA_ARGS__); \
 		} \
 	} while (0)
 
@@ -70,7 +69,7 @@ void hpi_debug_data(u16 *pdata, u32 len);
 	do { \
 		if (hpi_debug_level >= HPI_DEBUG_LEVEL_##level) { \
 			hpi_debug_message(phm, HPI_DEBUG_FLAG_##level \
-				FILE_LINE __stringify(level)); \
+				FILE_LINE " " __stringify(level)); \
 		} \
 	} while (0)