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powerpc: Constify struct kobj_type

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'struct kobj_type' is not modified. It is only used in
kobject_init_and_add()/kobject_init() which takes
a 'const struct kobj_type *ktype' parameter.

Constifying this structure moves some data to a read-only section,
so increase over all security.

On a x86_64, compiled with ppc64 defconfig:
Before:
======
   text	   data	    bss	    dec	    hex	filename
   7145	    606	      0	   7751	   1e47	arch/powerpc/kernel/cacheinfo.o
   3663	    384	     16	   4063	    fdf	arch/powerpc/kernel/secvar-sysfs.o

After:
======
   text    data     bss     dec     hex filename
   7193	    558	      0	   7751	   1e47	arch/powerpc/kernel/cacheinfo.o
   3663	    384	     16	   4063	    fdf	arch/powerpc/kernel/secvar-sysfs.o

Signed-off-by: Huang Xiaojia <huangxiaojia2@huawei.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240826150957.3500237-1-huangxiaojia2@huawei.com
This commit is contained in:
Huang Xiaojia 2024-08-26 23:09:55 +08:00 committed by Michael Ellerman
parent 02b98ff44a
commit 7509c23770
2 changed files with 2 additions and 2 deletions
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2
arch/powerpc/kernel/cacheinfo.c
View File

@ -735,7 +735,7 @@ static const struct sysfs_ops cache_index_ops = {
.show = cache_index_show,
};
static struct kobj_type cache_index_type = {
static const struct kobj_type cache_index_type = {
.release = cache_index_release,
.sysfs_ops = &cache_index_ops,
.default_groups = cache_index_default_groups,

2
arch/powerpc/kernel/secvar-sysfs.c
View File

@ -125,7 +125,7 @@ static const struct attribute_group secvar_attr_group = {
};
__ATTRIBUTE_GROUPS(secvar_attr);
static struct kobj_type secvar_ktype = {
static const struct kobj_type secvar_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
.default_groups = secvar_attr_groups,
};