scsi: Conditionally compile in constants.c

Instead of having constants.c littered with ifdef statements we should
be moving dummy functions into the header and condintionally compile in
constants.c if selected. And update the Kconfig description to reflect
the actual size difference.

Suggested-by: Christoph Hellwig <hch@infradead.org>
Tested-by: Robert Elliott <elliott@hp.com>
Reviewed-by: Robert Elliott <elliott@hp.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>

4 files changed, 5 insertions, 48 deletions

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 9c92f415229f..b021bcb88537 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -201,12 +201,12 @@ config SCSI_ENCLOSURE
 	  certain enclosure conditions to be reported and is not required.
 
 config SCSI_CONSTANTS
-	bool "Verbose SCSI error reporting (kernel size +=12K)"
+	bool "Verbose SCSI error reporting (kernel size +=75K)"
 	depends on SCSI
 	help
 	  The error messages regarding your SCSI hardware will be easier to
 	  understand if you say Y here; it will enlarge your kernel by about
-	  12 KB. If in doubt, say Y.
+	  75 KB. If in doubt, say Y.
 
 config SCSI_LOGGING
 	bool "SCSI logging facility"
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 447c2d24aafa..dee160a4f163 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -159,9 +159,9 @@ obj-$(CONFIG_SCSI_OSD_INITIATOR) += osd/
 
 # This goes last, so that "real" scsi devices probe earlier
 obj-$(CONFIG_SCSI_DEBUG)	+= scsi_debug.o
-
-scsi_mod-y			+= scsi.o hosts.o scsi_ioctl.o constants.o \
+scsi_mod-y			+= scsi.o hosts.o scsi_ioctl.o \
 				   scsicam.o scsi_error.o scsi_lib.o
+scsi_mod-$(CONFIG_SCSI_CONSTANTS) += constants.o
 scsi_mod-$(CONFIG_SCSI_DMA)	+= scsi_lib_dma.o
 scsi_mod-y			+= scsi_scan.o scsi_sysfs.o scsi_devinfo.o
 scsi_mod-$(CONFIG_SCSI_NETLINK)	+= scsi_netlink.o
diff --git a/drivers/scsi/constants.c b/drivers/scsi/constants.c
index 956fbdd38681..fa09d4be2b53 100644
--- a/drivers/scsi/constants.c
+++ b/drivers/scsi/constants.c
@@ -18,8 +18,6 @@
 #include <scsi/scsi_eh.h>
 #include <scsi/scsi_dbg.h>
 
-
-
 /* Commands with service actions that change the command name */
 #define THIRD_PARTY_COPY_OUT 0x83
 #define THIRD_PARTY_COPY_IN 0x84
@@ -35,7 +33,6 @@ struct value_name_pair {
 	const char * name;
 };
 
-#ifdef CONFIG_SCSI_CONSTANTS
 static const char * cdb_byte0_names[] = {
 /* 00-03 */ "Test Unit Ready", "Rezero Unit/Rewind", NULL, "Request Sense",
 /* 04-07 */ "Format Unit/Medium", "Read Block Limits", NULL,
@@ -259,26 +256,6 @@ static struct sa_name_list sa_names_arr[] = {
 	{0, NULL, 0},
 };
 
-#else /* ifndef CONFIG_SCSI_CONSTANTS */
-static const char *cdb_byte0_names[0];
-
-static struct sa_name_list sa_names_arr[] = {
-	{VARIABLE_LENGTH_CMD, NULL, 0},
-	{MAINTENANCE_IN, NULL, 0},
-	{MAINTENANCE_OUT, NULL, 0},
-	{PERSISTENT_RESERVE_IN, NULL, 0},
-	{PERSISTENT_RESERVE_OUT, NULL, 0},
-	{SERVICE_ACTION_IN_12, NULL, 0},
-	{SERVICE_ACTION_OUT_12, NULL, 0},
-	{SERVICE_ACTION_BIDIRECTIONAL, NULL, 0},
-	{SERVICE_ACTION_IN_16, NULL, 0},
-	{SERVICE_ACTION_OUT_16, NULL, 0},
-	{THIRD_PARTY_COPY_IN, NULL, 0},
-	{THIRD_PARTY_COPY_OUT, NULL, 0},
-	{0, NULL, 0},
-};
-#endif /* CONFIG_SCSI_CONSTANTS */
-
 bool scsi_opcode_sa_name(int opcode, int service_action,
 			 const char **cdb_name, const char **sa_name)
 {
@@ -313,8 +290,6 @@ bool scsi_opcode_sa_name(int opcode, int service_action,
 	return true;
 }
 
-#ifdef CONFIG_SCSI_CONSTANTS
-
 struct error_info {
 	unsigned short code12;	/* 0x0302 looks better than 0x03,0x02 */
 	const char * text;
@@ -1203,15 +1178,12 @@ static const char * const snstext[] = {
 	"Completed",	    /* F: command completed sense data reported,
 				  may occur for successful command */
 };
-#endif
 
 /* Get sense key string or NULL if not available */
 const char *
 scsi_sense_key_string(unsigned char key) {
-#ifdef CONFIG_SCSI_CONSTANTS
 	if (key <= 0xE)
 		return snstext[key];
-#endif
 	return NULL;
 }
 EXPORT_SYMBOL(scsi_sense_key_string);
@@ -1223,7 +1195,6 @@ EXPORT_SYMBOL(scsi_sense_key_string);
 const char *
 scsi_extd_sense_format(unsigned char asc, unsigned char ascq, const char **fmt)
 {
-#ifdef CONFIG_SCSI_CONSTANTS
 	int i;
 	unsigned short code = ((asc << 8) | ascq);
 
@@ -1239,15 +1210,10 @@ scsi_extd_sense_format(unsigned char asc, unsigned char ascq, const char **fmt)
 			return additional2[i].str;
 		}
 	}
-#else
-	*fmt = NULL;
-#endif
 	return NULL;
 }
 EXPORT_SYMBOL(scsi_extd_sense_format);
 
-#ifdef CONFIG_SCSI_CONSTANTS
-
 static const char * const hostbyte_table[]={
 "DID_OK", "DID_NO_CONNECT", "DID_BUS_BUSY", "DID_TIME_OUT", "DID_BAD_TARGET",
 "DID_ABORT", "DID_PARITY", "DID_ERROR", "DID_RESET", "DID_BAD_INTR",
@@ -1259,17 +1225,13 @@ static const char * const driverbyte_table[]={
 "DRIVER_OK", "DRIVER_BUSY", "DRIVER_SOFT",  "DRIVER_MEDIA", "DRIVER_ERROR",
 "DRIVER_INVALID", "DRIVER_TIMEOUT", "DRIVER_HARD", "DRIVER_SENSE"};
 
-#endif
-
 const char *scsi_hostbyte_string(int result)
 {
 	const char *hb_string = NULL;
-#ifdef CONFIG_SCSI_CONSTANTS
 	int hb = host_byte(result);
 
 	if (hb < ARRAY_SIZE(hostbyte_table))
 		hb_string = hostbyte_table[hb];
-#endif
 	return hb_string;
 }
 EXPORT_SYMBOL(scsi_hostbyte_string);
@@ -1277,17 +1239,14 @@ EXPORT_SYMBOL(scsi_hostbyte_string);
 const char *scsi_driverbyte_string(int result)
 {
 	const char *db_string = NULL;
-#ifdef CONFIG_SCSI_CONSTANTS
 	int db = driver_byte(result);
 
 	if (db < ARRAY_SIZE(driverbyte_table))
 		db_string = driverbyte_table[db];
-#endif
 	return db_string;
 }
 EXPORT_SYMBOL(scsi_driverbyte_string);
 
-#ifdef CONFIG_SCSI_CONSTANTS
 #define scsi_mlreturn_name(result)	{ result, #result }
 static const struct value_name_pair scsi_mlreturn_arr[] = {
 	scsi_mlreturn_name(NEEDS_RETRY),
@@ -1300,11 +1259,9 @@ static const struct value_name_pair scsi_mlreturn_arr[] = {
 	scsi_mlreturn_name(SCSI_RETURN_NOT_HANDLED),
 	scsi_mlreturn_name(FAST_IO_FAIL)
 };
-#endif
 
 const char *scsi_mlreturn_string(int result)
 {
-#ifdef CONFIG_SCSI_CONSTANTS
 	const struct value_name_pair *arr = scsi_mlreturn_arr;
 	int k;
 
@@ -1312,7 +1269,6 @@ const char *scsi_mlreturn_string(int result)
 		if (result == arr->value)
 			return arr->name;
 	}
-#endif
 	return NULL;
 }
 EXPORT_SYMBOL(scsi_mlreturn_string);
diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index e999496eda3e..471ab0661696 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -47,6 +47,7 @@
 
 #include <generated/utsrelease.h>
 
+#include <scsi/scsi.h>
 #include <scsi/scsi_dbg.h>
 #include <scsi/scsi_eh.h>
 #include <scsi/scsi_tcq.h>