Make /dev/port conditional on config symbol

Instead of having /dev/port support dependent in multiple places on a
string of preprocessor symbols, define a new configuration directive for
it.  This ensures that all four places remain consistent with each other.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 10 insertions, 4 deletions

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index a26d91743b2..eeb5d9693ab 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -1071,5 +1071,11 @@ config TELCLOCK
           /sys/devices/platform/telco_clock, with a number of files for
           controlling the behavior of this hardware.
 
+config DEVPORT
+        bool
+        depends on !M68K
+        depends on ISA || PCI
+        default y
+
 endmenu
 
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 2c6fc505cc3..cc9a9d0df97 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -551,7 +551,7 @@ static ssize_t write_kmem(struct file * file, const char __user * buf,
         return virtr + wrote;
 }
 
-#if (defined(CONFIG_ISA) || defined(CONFIG_PCI)) && !defined(__mc68000__)
+#ifdef CONFIG_DEVPORT
 static ssize_t read_port(struct file * file, char __user * buf,
                          size_t count, loff_t *ppos)
 {
@@ -834,7 +834,7 @@ static const struct file_operations null_fops = {
         .splice_write   = splice_write_null,
 };
 
-#if (defined(CONFIG_ISA) || defined(CONFIG_PCI)) && !defined(__mc68000__)
+#ifdef CONFIG_DEVPORT
 static const struct file_operations port_fops = {
         .llseek         = memory_lseek,
         .read           = read_port,
@@ -912,7 +912,7 @@ static int memory_open(struct inode * inode, struct file * filp)
                 case 3:
                         filp->f_op = &null_fops;
                         break;
-#if (defined(CONFIG_ISA) || defined(CONFIG_PCI)) && !defined(__mc68000__)
+#ifdef CONFIG_DEVPORT
                 case 4:
                         filp->f_op = &port_fops;
                         break;
@@ -959,7 +959,7 @@ static const struct {
         {1, "mem",     S_IRUSR | S_IWUSR | S_IRGRP, &mem_fops},
         {2, "kmem",    S_IRUSR | S_IWUSR | S_IRGRP, &kmem_fops},
         {3, "null",    S_IRUGO | S_IWUGO,           &null_fops},
-#if (defined(CONFIG_ISA) || defined(CONFIG_PCI)) && !defined(__mc68000__)
+#ifdef CONFIG_DEVPORT
         {4, "port",    S_IRUSR | S_IWUSR | S_IRGRP, &port_fops},
 #endif
         {5, "zero",    S_IRUGO | S_IWUGO,           &zero_fops},