diff options
Diffstat (limited to 'arch/s390/mm/kasan_init.c')
-rw-r--r-- | arch/s390/mm/kasan_init.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/s390/mm/kasan_init.c b/arch/s390/mm/kasan_init.c index e4697900e884..40748afc43fa 100644 --- a/arch/s390/mm/kasan_init.c +++ b/arch/s390/mm/kasan_init.c @@ -15,6 +15,7 @@ static unsigned long segment_pos __initdata; static unsigned long segment_low __initdata; static unsigned long pgalloc_pos __initdata; static unsigned long pgalloc_low __initdata; +static unsigned long pgalloc_freeable __initdata; static bool has_edat __initdata; static bool has_nx __initdata; @@ -298,14 +299,16 @@ void __init kasan_early_init(void) * | 2Gb | \| unmapped | allocated per module * +-----------------+ +- shadow end ---+ */ - /* populate identity mapping */ - kasan_early_vmemmap_populate(0, memsize, POPULATE_ONE2ONE); /* populate kasan shadow (for identity mapping and zero page mapping) */ kasan_early_vmemmap_populate(__sha(0), __sha(memsize), POPULATE_MAP); if (IS_ENABLED(CONFIG_MODULES)) untracked_mem_end = vmax - MODULES_LEN; kasan_early_vmemmap_populate(__sha(memsize), __sha(untracked_mem_end), POPULATE_ZERO_SHADOW); + /* memory allocated for identity mapping structs will be freed later */ + pgalloc_freeable = pgalloc_pos; + /* populate identity mapping */ + kasan_early_vmemmap_populate(0, memsize, POPULATE_ONE2ONE); kasan_set_pgd(early_pg_dir, asce_type); kasan_enable_dat(); /* enable kasan */ @@ -345,3 +348,8 @@ void __init kasan_copy_shadow(pgd_t *pg_dir) memcpy(pu_dir_dst, pu_dir_src, (KASAN_SHADOW_SIZE >> PUD_SHIFT) * sizeof(pud_t)); } + +void __init kasan_free_early_identity(void) +{ + memblock_free(pgalloc_pos, pgalloc_freeable - pgalloc_pos); +} |