[PATCH 0/5] constify drm pci_device_id

[PATCH 0/5] constify drm pci_device_id

[Arvind Yadav]

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

Arvind Yadav (5):
  [PATCH 1/5] drm: radeon: constify pci_device_id.
  [PATCH 2/5] drm: vmwgfx: constify pci_device_id.
  [PATCH 3/5] drm: nouveau: constify pci_device_id.
  [PATCH 4/5] drm: via: constify pci_device_id.
  [PATCH 5/5] drm: hisilicon: constify pci_device_id.

 drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 2 +-
 drivers/gpu/drm/nouveau/nouveau_drm.c           | 2 +-
 drivers/gpu/drm/radeon/radeon_drv.c             | 2 +-
 drivers/gpu/drm/via/via_drv.c                   | 2 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c             | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

-- 
2.7.4

[PATCH 1/5] drm: radeon: constify pci_device_id.

[Arvind Yadav]

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

File size before:
   text	   data	    bss	    dec	    hex	filename
   6560	  23212	     72	  29844	   7494	gpu/drm/radeon/radeon_drv.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
  28960	    812	     72	  29844	   7494	gpu/drm/radeon/radeon_drv.o

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

diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index e25cb51..b079937 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -298,7 +298,7 @@ module_param_named(uvd, radeon_uvd, int, 0444);
 MODULE_PARM_DESC(vce, "vce enable/disable vce support (1 = enable, 0 = disable)");
 module_param_named(vce, radeon_vce, int, 0444);
 
-static struct pci_device_id pciidlist[] = {
+static const struct pci_device_id pciidlist[] = {
 	radeon_PCI_IDS
 };
 
-- 
2.7.4

Re: [PATCH 1/5] drm: radeon: constify pci_device_id.

[Christian König]

Am 15.07.2017 um 09:12 schrieb Arvind Yadav:
> pci_device_id are not supposed to change at runtime. All functions
> working with pci_device_id provided by <linux/pci.h> work with
> const pci_device_id. So mark the non-const structs as const.
>
> File size before:
>     text	   data	    bss	    dec	    hex	filename
>     6560	  23212	     72	  29844	   7494	gpu/drm/radeon/radeon_drv.o
>
> File size After adding 'const':
>     text	   data	    bss	    dec	    hex	filename
>    28960	    812	     72	  29844	   7494	gpu/drm/radeon/radeon_drv.o
>
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>

Impressive result for such a simple change.

Patch is Reviewed-by: Christian König <christian.koenig@amd.com>

Are the PCI IDs already const in amdgpu or do we need a similar patch 
there as well? I only see patch 1 of 5 in my inbox.

Christian.

> ---
>   drivers/gpu/drm/radeon/radeon_drv.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
> index e25cb51..b079937 100644
> --- a/drivers/gpu/drm/radeon/radeon_drv.c
> +++ b/drivers/gpu/drm/radeon/radeon_drv.c
> @@ -298,7 +298,7 @@ module_param_named(uvd, radeon_uvd, int, 0444);
>   MODULE_PARM_DESC(vce, "vce enable/disable vce support (1 = enable, 0 = disable)");
>   module_param_named(vce, radeon_vce, int, 0444);
>   
> -static struct pci_device_id pciidlist[] = {
> +static const struct pci_device_id pciidlist[] = {
>   	radeon_PCI_IDS
>   };
>