[PATCH] mark struct file_operations const 1

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.

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, 4 insertions, 4 deletions

diff --git a/include/linux/atalk.h b/include/linux/atalk.h
index 75b8baca08f3..d12984ddaa9f 100644
--- a/include/linux/atalk.h
+++ b/include/linux/atalk.h
@@ -182,7 +182,7 @@ extern rwlock_t atalk_interfaces_lock;
 
 extern struct atalk_route atrtr_default;
 
-extern struct file_operations atalk_seq_arp_fops;
+extern const struct file_operations atalk_seq_arp_fops;
 
 extern int sysctl_aarp_expiry_time;
 extern int sysctl_aarp_tick_time;
diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index fd404416f31c..826b15e914e2 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -55,7 +55,7 @@ extern int cpuset_excl_nodes_overlap(const struct task_struct *p);
 extern int cpuset_memory_pressure_enabled;
 extern void __cpuset_memory_pressure_bump(void);
 
-extern struct file_operations proc_cpuset_operations;
+extern const struct file_operations proc_cpuset_operations;
 extern char *cpuset_task_status_allowed(struct task_struct *task, char *buffer);
 
 extern void cpuset_lock(void);
diff --git a/include/linux/random.h b/include/linux/random.h
index 01ad71033d65..36f125c0c603 100644
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -63,7 +63,7 @@ extern u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr,
                                        __be16 sport, __be16 dport);
 
 #ifndef MODULE
-extern struct file_operations random_fops, urandom_fops;
+extern const struct file_operations random_fops, urandom_fops;
 #endif
 
 unsigned int get_random_int(void);
diff --git a/include/linux/security.h b/include/linux/security.h
index c554f60f18e4..7f88d97575fd 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -2130,7 +2130,7 @@ extern int mod_reg_security	(const char *name, struct security_operations *ops);
 extern int mod_unreg_security   (const char *name, struct security_operations *ops);
 extern struct dentry *securityfs_create_file(const char *name, mode_t mode,
                                              struct dentry *parent, void *data,
-                                             struct file_operations *fops);
+                                             const struct file_operations *fops);
 extern struct dentry *securityfs_create_dir(const char *name, struct dentry *parent);
 extern void securityfs_remove(struct dentry *dentry);