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| author | Vasily Gorbik <gor@linux.ibm.com> | 2017-11-19 13:54:14 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-10-09 12:21:29 +0300 |
| commit | 5dff03813f46f267bc1ecb334901e916346692ff (patch) | |
| tree | e9bbcc7ed939aca9e7c180d7946e1f728bc7883c /arch/s390/kernel | |
| parent | 135ff163939294f5573927ca890699ed619c0031 (diff) | |
| download | linux-5dff03813f46f267bc1ecb334901e916346692ff.tar.xz | |
s390/kasan: add option for 4-level paging support
By default 3-level paging is used when the kernel is compiled with
kasan support. Add 4-level paging option to support systems with more
then 3TB of physical memory and to cover 4-level paging specific code
with kasan as well.
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/setup.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index d7548806d887..4b2039f3e2f4 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -535,7 +535,9 @@ static void __init setup_memory_end(void) /* Choose kernel address space layout: 3 or 4 levels. */ vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN; if (IS_ENABLED(CONFIG_KASAN)) { - vmax = _REGION2_SIZE; /* 3-level kernel page table */ + vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING) + ? _REGION1_SIZE + : _REGION2_SIZE; } else { tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE; tmp = tmp * (sizeof(struct page) + PAGE_SIZE); |