[PATCH] scsi: ibmvscsi: constify dev_pm_ops structures.

[PATCH] scsi: ibmvscsi: constify dev_pm_ops structures.

[Arvind Yadav]

dev_pm_ops are not supposed to change at runtime. All functions
working with dev_pm_ops provided by <linux/device.h> work with const
dev_pm_ops. So mark the non-const structs as const.

File size before:
   text	   data	    bss	    dec	    hex	filename
  17956	   1456	      8	  19420	   4bdc	drivers/scsi/ibmvscsi/ibmvscsi.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
  18164	   1264	      8	  19436	   4bec	drivers/scsi/ibmvscsi/ibmvscsi.o

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
---
 drivers/scsi/ibmvscsi/ibmvscsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 1deb0a9..da22b36 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -2336,7 +2336,7 @@ static int ibmvscsi_resume(struct device *dev)
 };
 MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
 
-static struct dev_pm_ops ibmvscsi_pm_ops = {
+static const struct dev_pm_ops ibmvscsi_pm_ops = {
 	.resume = ibmvscsi_resume
 };
 
-- 
1.9.1

Re: [PATCH] scsi: ibmvscsi: constify dev_pm_ops structures.

[Tyrel Datwyler]

On 06/29/2017 12:43 AM, Arvind Yadav wrote:
> dev_pm_ops are not supposed to change at runtime. All functions
> working with dev_pm_ops provided by <linux/device.h> work with const
> dev_pm_ops. So mark the non-const structs as const.
> 
> File size before:
>    text	   data	    bss	    dec	    hex	filename
>   17956	   1456	      8	  19420	   4bdc	drivers/scsi/ibmvscsi/ibmvscsi.o
> 
> File size After adding 'const':
>    text	   data	    bss	    dec	    hex	filename
>   18164	   1264	      8	  19436	   4bec	drivers/scsi/ibmvscsi/ibmvscsi.o
> 
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>

Acked-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>

Re: [PATCH] scsi: ibmvscsi: constify dev_pm_ops structures.

[Martin K. Petersen]

Arvind,

> dev_pm_ops are not supposed to change at runtime. All functions
> working with dev_pm_ops provided by <linux/device.h> work with const
> dev_pm_ops. So mark the non-const structs as const.

Applied to 4.13/scsi-queue.

-- 
Martin K. Petersen	Oracle Linux Engineering

[PATCH] scsi: ibmvscsi: constify dev_pm_ops structures

[Bhumika Goyal]

Declare dev_pm_ops structures as const as they are only stored in the pm
field of a vio_driver structure. This field is of type const, so
dev_pm_ops structures having similar properties can be declared const.
Done using Coccinelle:

@r1 disable optional_qualifier@
identifier i;
position p;
@@
static struct dev_pm_ops i@p={...};

@ok@
identifier r1.i;
position p;
struct vio_driver x;
@@
x.pm=&i@p;

@bad@
position p!={r1.p,ok.p};
identifier r1.i;
@@
i@p

@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
+const
struct dev_pm_ops i;

File sizes after cross compiling the .o files for powerpc architecture.

File size before:
  text	   data	    bss	    dec	    hex	filename
  57893	   5665	     20	  63578	   f85a	drivers/scsi/ibmvscsi/ibmvfc.o

File size after:
  text	   data	    bss	    dec	    hex	filename
  58077	   5481	     20	  63578	   f85a	drivers/scsi/ibmvscsi/ibmvfc.o

File size before:
   text	   data	    bss	    dec	    hex	filenam
  20990	   2816	     80	  23886	   5d4e	drivers/scsi/ibmvscsi/ibmvscsi.o

File size after:
  text	   data	    bss	    dec	    hex	filename
  21174	   2632	     80	  23886	   5d4e	drivers/scsi/ibmvscsi/ibmvscsi.o

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
---
 drivers/scsi/ibmvscsi/ibmvfc.c   | 2 +-
 drivers/scsi/ibmvscsi/ibmvscsi.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 78b72c2..1e1b343 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -4940,7 +4940,7 @@ static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
 };
 MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
 
-static struct dev_pm_ops ibmvfc_pm_ops = {
+static const struct dev_pm_ops ibmvfc_pm_ops = {
 	.resume = ibmvfc_resume
 };
 
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 50cd011..b94e7b1 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -2335,7 +2335,7 @@ static int ibmvscsi_resume(struct device *dev)
 };
 MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
 
-static struct dev_pm_ops ibmvscsi_pm_ops = {
+static const struct dev_pm_ops ibmvscsi_pm_ops = {
 	.resume = ibmvscsi_resume
 };
 
-- 
1.9.1