[PATCH] mark struct file_operations const 2

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@osdl.org: sparc64 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>

5 files changed, 8 insertions, 8 deletions

diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index ce49fe3..c1dca22 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -1881,7 +1881,7 @@ ioc_open(struct inode *inode, struct file *file)
 	return seq_open(file, &ioc_seq_ops);
 }
 
-static struct file_operations ioc_fops = {
+static const struct file_operations ioc_fops = {
 	.open    = ioc_open,
 	.read    = seq_read,
 	.llseek  = seq_lseek,
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index 86e144f..9860794 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -621,7 +621,7 @@ EXPORT_PER_CPU_SYMBOL_GPL(pfm_syst_info);
 
 
 /* forward declaration */
-static struct file_operations pfm_file_ops;
+static const struct file_operations pfm_file_ops;
 
 /*
  * forward declarations
@@ -2126,7 +2126,7 @@ pfm_no_open(struct inode *irrelevant, struct file *dontcare)
 
 
 
-static struct file_operations pfm_file_ops = {
+static const struct file_operations pfm_file_ops = {
 	.llseek   = no_llseek,
 	.read     = pfm_read,
 	.write    = pfm_write,
@@ -6596,7 +6596,7 @@ found:
 	return 0;
 }
 
-static struct file_operations pfm_proc_fops = {
+static const struct file_operations pfm_proc_fops = {
 	.open		= pfm_proc_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
diff --git a/arch/ia64/kernel/salinfo.c b/arch/ia64/kernel/salinfo.c
index e375a2f..af9f875 100644
--- a/arch/ia64/kernel/salinfo.c
+++ b/arch/ia64/kernel/salinfo.c
@@ -352,7 +352,7 @@ retry:
 	return size;
 }
 
-static struct file_operations salinfo_event_fops = {
+static const struct file_operations salinfo_event_fops = {
 	.open  = salinfo_event_open,
 	.read  = salinfo_event_read,
 };
@@ -568,7 +568,7 @@ salinfo_log_write(struct file *file, const char __user *buffer, size_t count, lo
 	return count;
 }
 
-static struct file_operations salinfo_data_fops = {
+static const struct file_operations salinfo_data_fops = {
 	.open    = salinfo_log_open,
 	.release = salinfo_log_release,
 	.read    = salinfo_log_read,
diff --git a/arch/ia64/sn/kernel/sn2/sn2_smp.c b/arch/ia64/sn/kernel/sn2/sn2_smp.c
index d9d306c..601747b 100644
--- a/arch/ia64/sn/kernel/sn2/sn2_smp.c
+++ b/arch/ia64/sn/kernel/sn2/sn2_smp.c
@@ -455,7 +455,7 @@ static int sn2_ptc_proc_open(struct inode *inode, struct file *file)
 	return seq_open(file, &sn2_ptc_seq_ops);
 }
 
-static struct file_operations proc_sn2_ptc_operations = {
+static const struct file_operations proc_sn2_ptc_operations = {
 	.open = sn2_ptc_proc_open,
 	.read = seq_read,
 	.llseek = seq_lseek,
diff --git a/arch/ia64/sn/kernel/sn2/sn_hwperf.c b/arch/ia64/sn/kernel/sn2/sn_hwperf.c
index 3336799..6da9854 100644
--- a/arch/ia64/sn/kernel/sn2/sn_hwperf.c
+++ b/arch/ia64/sn/kernel/sn2/sn_hwperf.c
@@ -865,7 +865,7 @@ error:
 	return r;
 }
 
-static struct file_operations sn_hwperf_fops = {
+static const struct file_operations sn_hwperf_fops = {
 	.ioctl = sn_hwperf_ioctl,
 };