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[PATCH] Staging : lustre: Struct file_operations should be const

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  [PATCH] Staging : lustre: Struct file_operations should be const Shraddha Barke <shraddha.6596@gmail.com> - 2015-08-03 07:50 +0200
    Re: [PATCH] Staging : lustre: Struct file_operations should be const Sudip Mukherjee <sudipm.mukherjee@gmail.com> - 2015-08-03 09:20 +0200

#1198556 — [PATCH] Staging : lustre: Struct file_operations should be const

Declare the file_operations structure ll_file_operations as const, as done
elsewhere in the kernel, as there are no modifications to its fields.

Problem found using checkpatch:

WARNING: struct file_operations should normally be const

Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
---
 drivers/staging/lustre/lustre/llite/file.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
index dcd0c6d..2c467bf 100644
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -3116,7 +3116,7 @@ int ll_inode_permission(struct inode *inode, int mask)
 }
 
 /* -o localflock - only provides locally consistent flock locks */
-struct file_operations ll_file_operations = {
+const struct file_operations ll_file_operations = {
 	.read_iter = ll_file_read_iter,
 	.write_iter = ll_file_write_iter,
 	.unlocked_ioctl = ll_file_ioctl,
@@ -3129,7 +3129,7 @@ struct file_operations ll_file_operations = {
 	.flush	  = ll_flush
 };
 
-struct file_operations ll_file_operations_flock = {
+const struct file_operations ll_file_operations_flock = {
 	.read_iter    = ll_file_read_iter,
 	.write_iter   = ll_file_write_iter,
 	.unlocked_ioctl = ll_file_ioctl,
@@ -3145,7 +3145,7 @@ struct file_operations ll_file_operations_flock = {
 };
 
 /* These are for -o noflock - to return ENOSYS on flock calls */
-struct file_operations ll_file_operations_noflock = {
+const struct file_operations ll_file_operations_noflock = {
 	.read_iter    = ll_file_read_iter,
 	.write_iter   = ll_file_write_iter,
 	.unlocked_ioctl = ll_file_ioctl,
-- 
2.1.0

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#1198587

On Mon, Aug 03, 2015 at 11:17:06AM +0530, Shraddha Barke wrote:
> Declare the file_operations structure ll_file_operations as const, as done
> elsewhere in the kernel, as there are no modifications to its fields.
> 
> Problem found using checkpatch:
> 
> WARNING: struct file_operations should normally be const
> 
> Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
> ---
You have not even build tested your patch before sending. :(
	
drivers/staging/lustre/lustre/llite/file.c:3119:30: error: conflicting type qualifiers for ‘ll_file_operations’
 const struct file_operations ll_file_operations = {
                              ^
In file included from drivers/staging/lustre/lustre/llite/file.c:48:0:
drivers/staging/lustre/lustre/llite/llite_internal.h:710:31: note: previous declaration of ‘ll_file_operations’ was here
 extern struct file_operations ll_file_operations;
                               ^
drivers/staging/lustre/lustre/llite/file.c:3132:30: error: conflicting type qualifiers for ‘ll_file_operations_flock’
 const struct file_operations ll_file_operations_flock = {
                              ^
In file included from drivers/staging/lustre/lustre/llite/file.c:48:0:
drivers/staging/lustre/lustre/llite/llite_internal.h:711:31: note: previous declaration of ‘ll_file_operations_flock’ was here
 extern struct file_operations ll_file_operations_flock;
                               ^
drivers/staging/lustre/lustre/llite/file.c:3148:30: error: conflicting type qualifiers for ‘ll_file_operations_noflock’
 const struct file_operations ll_file_operations_noflock = {
                              ^
In file included from drivers/staging/lustre/lustre/llite/file.c:48:0:
drivers/staging/lustre/lustre/llite/llite_internal.h:712:31: note: previous declaration of ‘ll_file_operations_noflock’ was here
 extern struct file_operations ll_file_operations_noflock;
                               ^
make[3]: *** [drivers/staging/lustre/lustre/llite/file.o] Error 1
make[2]: *** [drivers/staging/lustre/lustre/llite] Error 2
make[1]: *** [drivers/staging/lustre/lustre] Error 2
make: *** [_module_drivers/staging/lustre] Error 2

regards
sudip
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