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fbdev: Constify struct sbus_mmap_map

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'struct sbus_mmap_map' are not modified in these drivers.

Constifying this structure moves some data to a read-only section, so
increases overall security.

Update sbusfb_mmap_helper() accordingly.

On a x86_64, with allmodconfig, as an example:
Before:
======
   text	   data	    bss	    dec	    hex	filename
   2452	    536	     16	   3004	    bbc	drivers/video/fbdev/bw2.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
   2500	    483	     16	   2999	    bb7	drivers/video/fbdev/bw2.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Christophe JAILLET 2024-10-13 13:48:01 +02:00 committed by Helge Deller
parent 57e755d333
commit 161e95b899
10 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/video/fbdev/bw2.c
View File

@ -147,7 +147,7 @@ bw2_blank(int blank, struct fb_info *info)
return 0; return 0;
} }
static struct sbus_mmap_map bw2_mmap_map[] = { static const struct sbus_mmap_map bw2_mmap_map[] = {
{ {
.size = SBUS_MMAP_FBSIZE(1) .size = SBUS_MMAP_FBSIZE(1)
}, },

2
drivers/video/fbdev/cg14.c
View File

@ -360,7 +360,7 @@ static void cg14_init_fix(struct fb_info *info, int linebytes,
info->fix.accel = FB_ACCEL_SUN_CG14; info->fix.accel = FB_ACCEL_SUN_CG14;
} }
static struct sbus_mmap_map __cg14_mmap_map[CG14_MMAP_ENTRIES] = { static const struct sbus_mmap_map __cg14_mmap_map[CG14_MMAP_ENTRIES] = {
{ {
.voff = CG14_REGS, .voff = CG14_REGS,
.poff = 0x80000000, .poff = 0x80000000,

2
drivers/video/fbdev/cg3.c
View File

@ -209,7 +209,7 @@ static int cg3_blank(int blank, struct fb_info *info)
return 0; return 0;
} }
static struct sbus_mmap_map cg3_mmap_map[] = { static const struct sbus_mmap_map cg3_mmap_map[] = {
{ {
.voff = CG3_MMAP_OFFSET, .voff = CG3_MMAP_OFFSET,
.poff = CG3_RAM_OFFSET, .poff = CG3_RAM_OFFSET,

2
drivers/video/fbdev/cg6.c
View File

@ -545,7 +545,7 @@ static int cg6_blank(int blank, struct fb_info *info)
return 0; return 0;
} }
static struct sbus_mmap_map cg6_mmap_map[] = { static const struct sbus_mmap_map cg6_mmap_map[] = {
{ {
.voff = CG6_FBC, .voff = CG6_FBC,
.poff = CG6_FBC_OFFSET, .poff = CG6_FBC_OFFSET,

2
drivers/video/fbdev/ffb.c
View File

@ -710,7 +710,7 @@ static int ffb_blank(int blank, struct fb_info *info)
return 0; return 0;
} }
static struct sbus_mmap_map ffb_mmap_map[] = { static const struct sbus_mmap_map ffb_mmap_map[] = {
{ {
.voff = FFB_SFB8R_VOFF, .voff = FFB_SFB8R_VOFF,
.poff = FFB_SFB8R_POFF, .poff = FFB_SFB8R_POFF,

2
drivers/video/fbdev/leo.c
View File

@ -338,7 +338,7 @@ static int leo_blank(int blank, struct fb_info *info)
return 0; return 0;
} }
static struct sbus_mmap_map leo_mmap_map[] = { static const struct sbus_mmap_map leo_mmap_map[] = {
{ {
.voff = LEO_SS0_MAP, .voff = LEO_SS0_MAP,
.poff = LEO_OFF_SS0, .poff = LEO_OFF_SS0,

2
drivers/video/fbdev/p9100.c
View File

@ -206,7 +206,7 @@ p9100_blank(int blank, struct fb_info *info)
return 0; return 0;
} }
static struct sbus_mmap_map p9100_mmap_map[] = { static const struct sbus_mmap_map p9100_mmap_map[] = {
{ CG3_MMAP_OFFSET, 0, SBUS_MMAP_FBSIZE(1) }, { CG3_MMAP_OFFSET, 0, SBUS_MMAP_FBSIZE(1) },
{ 0, 0, 0 } { 0, 0, 0 }
}; };

2
drivers/video/fbdev/sbuslib.c
View File

@ -38,7 +38,7 @@ static unsigned long sbusfb_mmapsize(long size, unsigned long fbsize)
return fbsize * (-size); return fbsize * (-size);
} }
int sbusfb_mmap_helper(struct sbus_mmap_map *map, int sbusfb_mmap_helper(const struct sbus_mmap_map *map,
unsigned long physbase, unsigned long physbase,
unsigned long fbsize, unsigned long fbsize,
unsigned long iospace, unsigned long iospace,

2
drivers/video/fbdev/sbuslib.h
View File

@ -19,7 +19,7 @@ struct sbus_mmap_map {
extern void sbusfb_fill_var(struct fb_var_screeninfo *var, extern void sbusfb_fill_var(struct fb_var_screeninfo *var,
struct device_node *dp, int bpp); struct device_node *dp, int bpp);
extern int sbusfb_mmap_helper(struct sbus_mmap_map *map, extern int sbusfb_mmap_helper(const struct sbus_mmap_map *map,
unsigned long physbase, unsigned long fbsize, unsigned long physbase, unsigned long fbsize,
unsigned long iospace, unsigned long iospace,
struct vm_area_struct *vma); struct vm_area_struct *vma);

2
drivers/video/fbdev/tcx.c
View File

@ -236,7 +236,7 @@ tcx_blank(int blank, struct fb_info *info)
return 0; return 0;
} }
static struct sbus_mmap_map __tcx_mmap_map[TCX_MMAP_ENTRIES] = { static const struct sbus_mmap_map __tcx_mmap_map[TCX_MMAP_ENTRIES] = {
{ {
.voff = TCX_RAM8BIT, .voff = TCX_RAM8BIT,
.size = SBUS_MMAP_FBSIZE(1) .size = SBUS_MMAP_FBSIZE(1)