printk: move size limit macros into internal.h

The size limit macros are located further down in printk.c and
behind ifdef conditionals. This complicates their usage for
upcoming changes. Move the macros into internal.h so that they
are still invisible outside of printk, but easily accessible
for printk.

Also, the maximum size of formatted extended messages does not
need to be known by any code outside of printk, so move it to
internal.h as well. And like CONSOLE_LOG_MAX, for !CONFIG_PRINTK
set CONSOLE_EXT_LOG_MAX to 0 to reduce the static memory
footprint.

Signed-off-by: John Ogness <[e-mail]>
Reviewed-by: Petr Mladek <[e-mail]>
Signed-off-by: Petr Mladek <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

include/linux/printk.h

···
 	return buffer;
 }
 
-#define CONSOLE_EXT_LOG_MAX	8192
-
 /* printk's without a loglevel use this.. */
 #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT
 

kernel/printk/internal.h

···
 
 #ifdef CONFIG_PRINTK
 
+#ifdef CONFIG_PRINTK_CALLER
+#define PREFIX_MAX		48
+#else
+#define PREFIX_MAX		32
+#endif
+
+/* the maximum size of a formatted record (i.e. with prefix added per line) */
+#define CONSOLE_LOG_MAX		1024
+
+/* the maximum size of a formatted extended record */
+#define CONSOLE_EXT_LOG_MAX	8192
+
+/* the maximum size for a dropped text message */
+#define DROPPED_TEXT_MAX	64
+
+/* the maximum size allowed to be reserved for a record */
+#define LOG_LINE_MAX		(CONSOLE_LOG_MAX - PREFIX_MAX)
+
 /* Flags for a single printk record. */
 enum printk_info_flags {
 	LOG_NEWLINE	= 2,	/* text ended with a newline */
···
 u16 printk_parse_prefix(const char *text, int *level,
 			enum printk_info_flags *flags);
 #else
+
+#define PREFIX_MAX		0
+#define CONSOLE_LOG_MAX		0
+#define CONSOLE_EXT_LOG_MAX	0
+#define DROPPED_TEXT_MAX	0
+#define LOG_LINE_MAX		0
 
 /*
  * In !PRINTK builds we still export console_sem

kernel/printk/printk.c

···
 	.val[1]		= 0,
 };
 
-#ifdef CONFIG_PRINTK_CALLER
-#define PREFIX_MAX		48
-#else
-#define PREFIX_MAX		32
-#endif
-
-/* the maximum size of a formatted record (i.e. with prefix added per line) */
-#define CONSOLE_LOG_MAX		1024
-
-/* the maximum size for a dropped text message */
-#define DROPPED_TEXT_MAX	64
-
-/* the maximum size allowed to be reserved for a record */
-#define LOG_LINE_MAX		(CONSOLE_LOG_MAX - PREFIX_MAX)
-
 #define LOG_LEVEL(v)		((v) & 0x07)
 #define LOG_FACILITY(v)		((v) >> 3 & 0xff)
 
···
 
 #else /* CONFIG_PRINTK */
 
-#define CONSOLE_LOG_MAX		0
-#define DROPPED_TEXT_MAX	0
 #define printk_time		false
 
 #define prb_read_valid(rb, seq, r)	false