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s390/kasan: optimize kasan vmemmap allocation 

Kasan implementation now supports memory hotplug operations. For that
reason regions of initially standby memory are now skipped from
shadow mapping and are mapped/unmapped dynamically upon bringing
memory online/offline.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik 2018-09-13 16:09:52 +02:00 committed by Martin Schwidefsky
parent 296352397d
commit 12e55fa194
1 changed files with 2 additions and 1 deletions
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3
arch/s390/mm/kasan_init.c
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@ -331,7 +331,8 @@ void __init kasan_early_init(void)
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),
kasan_early_vmemmap_populate(__sha(max_physmem_end),
__sha(untracked_mem_end),
POPULATE_ZERO_SHADOW);
/* memory allocated for identity mapping structs will be freed later */
pgalloc_freeable = pgalloc_pos;