From: Vasily Gorbik Date: Thu, 13 Sep 2018 14:09:52 +0000 (+0200) Subject: s390/kasan: optimize kasan vmemmap allocation X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=12e55fa1944d2f2f15c580a94eda80cb7623f89d;p=linux.git 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 Signed-off-by: Martin Schwidefsky --- diff --git a/arch/s390/mm/kasan_init.c b/arch/s390/mm/kasan_init.c index 6b0574340f7fd..5b253247bc972 100644 --- a/arch/s390/mm/kasan_init.c +++ b/arch/s390/mm/kasan_init.c @@ -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;