[PATCH 5/7] UBI: make debugging messages dynamic

[Artem Bityutskiy <dedekind1@gmail.com>]

From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

This patch adds a possibility to dynamically select UBI debugging
messages, instead of selecting them compile-time from the configuration
menu. This is much more flexible, and consistent with UBIFS, and this
also simplifies UBI Kconfig menu and the code.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
 drivers/mtd/ubi/Kconfig.debug |   30 ----------------------
 drivers/mtd/ubi/debug.c       |    8 ++++++
 drivers/mtd/ubi/debug.h       |   54 ++++++++++++++++++++++-------------------
 3 files changed, 37 insertions(+), 55 deletions(-)

diff --git a/drivers/mtd/ubi/Kconfig.debug b/drivers/mtd/ubi/Kconfig.debug
index fad4adc..d40134e 100644
--- a/drivers/mtd/ubi/Kconfig.debug
+++ b/drivers/mtd/ubi/Kconfig.debug
@@ -10,11 +10,6 @@ config MTD_UBI_DEBUG
 
 if MTD_UBI_DEBUG
 
-config MTD_UBI_DEBUG_MSG
-	bool "UBI debugging messages"
-	help
-	  This option enables UBI debugging messages.
-
 config MTD_UBI_DEBUG_PARANOID
 	bool "Extra self-checks"
 	help
@@ -45,29 +40,4 @@ config MTD_UBI_DEBUG_EMULATE_ERASE_FAILURES
 	  This option emulates erase failures with probability 1/100. Useful for
 	  debugging and testing how UBI handlines errors.
 
-comment "Additional UBI debugging messages"
-
-config MTD_UBI_DEBUG_MSG_BLD
-	bool "Additional UBI initialization and build messages"
-	help
-	  This option enables detailed UBI initialization and device build
-	  debugging messages.
-
-config MTD_UBI_DEBUG_MSG_EBA
-	bool "Eraseblock association unit messages"
-	help
-	  This option enables debugging messages from the UBI eraseblock
-	  association unit.
-
-config MTD_UBI_DEBUG_MSG_WL
-	bool "Wear-leveling unit messages"
-	help
-	  This option enables debugging messages from the UBI wear-leveling
-	  unit.
-
-config MTD_UBI_DEBUG_MSG_IO
-	bool "Input/output unit messages"
-	help
-	  This option enables debugging messages from the UBI input/output unit.
-
 endif # MTD_UBI_DEBUG
diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
index 4876977..8ae0bc7 100644
--- a/drivers/mtd/ubi/debug.c
+++ b/drivers/mtd/ubi/debug.c
@@ -27,6 +27,14 @@
 #ifdef CONFIG_MTD_UBI_DEBUG
 
 #include "ubi.h"
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+unsigned int ubi_msg_flags;
+
+module_param_named(debug_msgs, ubi_msg_flags, uint, S_IRUGO | S_IWUSR);
+
+MODULE_PARM_DESC(debug_msgs, "Debug message type flags");
 
 /**
  * ubi_dbg_dump_ec_hdr - dump an erase counter header.
diff --git a/drivers/mtd/ubi/debug.h b/drivers/mtd/ubi/debug.h
index 8bd1d17..bee6fa1 100644
--- a/drivers/mtd/ubi/debug.h
+++ b/drivers/mtd/ubi/debug.h
@@ -38,6 +38,11 @@
 	printk(KERN_DEBUG "UBI DBG (pid %d): %s: " fmt "\n", \
 	       current->pid, __func__, ##__VA_ARGS__)
 
+#define dbg_do_msg(typ, fmt, ...) do {                       \
+	if (ubi_msg_flags & typ)                             \
+		dbg_msg(fmt, ##__VA_ARGS__);                 \
+} while (0)
+
 #define ubi_dbg_dump_stack() dump_stack()
 
 struct ubi_ec_hdr;
@@ -57,43 +62,42 @@ void ubi_dbg_dump_seb(const struct ubi_scan_leb *seb, int type);
 void ubi_dbg_dump_mkvol_req(const struct ubi_mkvol_req *req);
 void ubi_dbg_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len);
 
+extern unsigned int ubi_msg_flags;
+
+/*
+ * Debugging message type flags (must match msg_type_names in debug.c).
+ *
+ * UBI_MSG_GEN: general messages
+ * UBI_MSG_EBA: journal messages
+ * UBI_MSG_WL: mount messages
+ * UBI_MSG_IO: commit messages
+ * UBI_MSG_BLD: LEB find messages
+ */
+enum {
+	UBI_MSG_GEN  = 0x1,
+	UBI_MSG_EBA  = 0x2,
+	UBI_MSG_WL   = 0x4,
+	UBI_MSG_IO   = 0x8,
+	UBI_MSG_BLD  = 0x10,
+};
+
 #define ubi_dbg_print_hex_dump(l, ps, pt, r, g, b, len, a)  \
 		print_hex_dump(l, ps, pt, r, g, b, len, a)
 
-#ifdef CONFIG_MTD_UBI_DEBUG_MSG
 /* General debugging messages */
-#define dbg_gen(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
-#else
-#define dbg_gen(fmt, ...) ({})
-#endif
+#define dbg_gen(fmt, ...) dbg_do_msg(UBI_MSG_GEN, fmt, ##__VA_ARGS__)
 
-#ifdef CONFIG_MTD_UBI_DEBUG_MSG_EBA
 /* Messages from the eraseblock association sub-system */
-#define dbg_eba(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
-#else
-#define dbg_eba(fmt, ...) ({})
-#endif
+#define dbg_eba(fmt, ...) dbg_do_msg(UBI_MSG_EBA, fmt, ##__VA_ARGS__)
 
-#ifdef CONFIG_MTD_UBI_DEBUG_MSG_WL
 /* Messages from the wear-leveling sub-system */
-#define dbg_wl(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
-#else
-#define dbg_wl(fmt, ...) ({})
-#endif
+#define dbg_wl(fmt, ...) dbg_do_msg(UBI_MSG_WL, fmt, ##__VA_ARGS__)
 
-#ifdef CONFIG_MTD_UBI_DEBUG_MSG_IO
 /* Messages from the input/output sub-system */
-#define dbg_io(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
-#else
-#define dbg_io(fmt, ...) ({})
-#endif
+#define dbg_io(fmt, ...) dbg_do_msg(UBI_MSG_IO, fmt, ##__VA_ARGS__)
 
-#ifdef CONFIG_MTD_UBI_DEBUG_MSG_BLD
 /* Initialization and build messages */
-#define dbg_bld(fmt, ...) dbg_msg(fmt, ##__VA_ARGS__)
-#else
-#define dbg_bld(fmt, ...) ({})
-#endif
+#define dbg_bld(fmt, ...) dbg_do_msg(UBI_MSG_BLD, fmt, ##__VA_ARGS__)
 
 #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
 int ubi_dbg_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len);
-- 
1.7.2.3