[PATCH] mark struct file_operations const 4

Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

[akpm@sdl.org: dvb fix]
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 7 insertions, 7 deletions

diff --git a/drivers/media/video/saa7134/saa7134-empress.c b/drivers/media/video/saa7134/saa7134-empress.c
index daaae870a2c4..f521603482ca 100644
--- a/drivers/media/video/saa7134/saa7134-empress.c
+++ b/drivers/media/video/saa7134/saa7134-empress.c
@@ -319,7 +319,7 @@ static int ts_ioctl(struct inode *inode, struct file *file,
         return video_usercopy(inode, file, cmd, arg, ts_do_ioctl);
 }
 
-static struct file_operations ts_fops =
+static const struct file_operations ts_fops =
 {
         .owner    = THIS_MODULE,
         .open     = ts_open,
diff --git a/drivers/media/video/saa7134/saa7134-oss.c b/drivers/media/video/saa7134/saa7134-oss.c
index bfcb860d14cc..72444f039e3d 100644
--- a/drivers/media/video/saa7134/saa7134-oss.c
+++ b/drivers/media/video/saa7134/saa7134-oss.c
@@ -563,7 +563,7 @@ static unsigned int dsp_poll(struct file *file, struct poll_table_struct *wait)
         return mask;
 }
 
-struct file_operations saa7134_dsp_fops = {
+const struct file_operations saa7134_dsp_fops = {
         .owner   = THIS_MODULE,
         .open    = dsp_open,
         .release = dsp_release,
@@ -804,7 +804,7 @@ static int mixer_ioctl(struct inode *inode, struct file *file,
         }
 }
 
-struct file_operations saa7134_mixer_fops = {
+const struct file_operations saa7134_mixer_fops = {
         .owner   = THIS_MODULE,
         .open    = mixer_open,
         .release = mixer_release,
diff --git a/drivers/media/video/saa7134/saa7134-video.c b/drivers/media/video/saa7134/saa7134-video.c
index 830617ea81cc..f2cb63053041 100644
--- a/drivers/media/video/saa7134/saa7134-video.c
+++ b/drivers/media/video/saa7134/saa7134-video.c
@@ -2336,7 +2336,7 @@ static int radio_ioctl(struct inode *inode, struct file *file,
         return video_usercopy(inode, file, cmd, arg, radio_do_ioctl);
 }
 
-static struct file_operations video_fops =
+static const struct file_operations video_fops =
 {
         .owner    = THIS_MODULE,
         .open     = video_open,
@@ -2349,7 +2349,7 @@ static struct file_operations video_fops =
         .llseek   = no_llseek,
 };
 
-static struct file_operations radio_fops =
+static const struct file_operations radio_fops =
 {
         .owner    = THIS_MODULE,
         .open     = video_open,
diff --git a/drivers/media/video/saa7134/saa7134.h b/drivers/media/video/saa7134/saa7134.h
index e88ad7b40c47..88cd1297df13 100644
--- a/drivers/media/video/saa7134/saa7134.h
+++ b/drivers/media/video/saa7134/saa7134.h
@@ -683,8 +683,8 @@ int saa_dsp_writel(struct saa7134_dev *dev, int reg, u32 value);
 /* ----------------------------------------------------------- */
 /* saa7134-oss.c                                               */
 
-extern struct file_operations saa7134_dsp_fops;
-extern struct file_operations saa7134_mixer_fops;
+extern const struct file_operations saa7134_dsp_fops;
+extern const struct file_operations saa7134_mixer_fops;
 
 int saa7134_oss_init1(struct saa7134_dev *dev);
 int saa7134_oss_fini(struct saa7134_dev *dev);