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s390/kasan: remove obvious parameter with the only possible value 

Kasan early code is only working on init_mm, remove unneeded pgd
parameter from kasan_copy_shadow and rename it to
kasan_copy_shadow_mapping.

Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2020-10-05 10:28:48 +02:00 committed by Heiko Carstens
parent 92bca2fe61
commit 54b52981bb
3 changed files with 5 additions and 5 deletions
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4
arch/s390/include/asm/kasan.h
View File

@ -12,12 +12,12 @@
#define KASAN_SHADOW_END (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
extern void kasan_early_init(void);
extern void kasan_copy_shadow(pgd_t *dst);
extern void kasan_copy_shadow_mapping(void);
extern void kasan_free_early_identity(void);
extern unsigned long kasan_vmax;
#else
static inline void kasan_early_init(void) { }
static inline void kasan_copy_shadow(pgd_t *dst) { }
static inline void kasan_copy_shadow_mapping(void) { }
static inline void kasan_free_early_identity(void) { }
#endif

2
arch/s390/mm/init.c
View File

@ -105,7 +105,7 @@ void __init paging_init(void)
S390_lowcore.user_asce = S390_lowcore.kernel_asce;
crst_table_init((unsigned long *) init_mm.pgd, pgd_type);
vmem_map_init();
kasan_copy_shadow(init_mm.pgd);
kasan_copy_shadow_mapping();
/* enable virtual mapping in kernel mode */
__ctl_load(S390_lowcore.kernel_asce, 1, 1);

4
arch/s390/mm/kasan_init.c
View File

@ -393,7 +393,7 @@ void __init kasan_early_init(void)
sclp_early_printk("KernelAddressSanitizer initialized\n");
}
void __init kasan_copy_shadow(pgd_t *pg_dir)
void __init kasan_copy_shadow_mapping(void)
{
/*
* At this point we are still running on early pages setup early_pg_dir,
@ -407,7 +407,7 @@ void __init kasan_copy_shadow(pgd_t *pg_dir)
p4d_t *p4_dir_dst;
pg_dir_src = pgd_offset_raw(early_pg_dir, KASAN_SHADOW_START);
pg_dir_dst = pgd_offset_raw(pg_dir, KASAN_SHADOW_START);
pg_dir_dst = pgd_offset_raw(init_mm.pgd, KASAN_SHADOW_START);
p4_dir_src = p4d_offset(pg_dir_src, KASAN_SHADOW_START);
p4_dir_dst = p4d_offset(pg_dir_dst, KASAN_SHADOW_START);
memcpy(p4_dir_dst, p4_dir_src,