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| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2016-05-10 12:10:22 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-05-11 10:20:30 +0200 |
| commit | c34a69059d7876e0793eb410deedfb08ccb22b02 (patch) | |
| tree | 18d24e5fd7a5f8e881467035e3e61368d1834adb /arch/s390/mm/vmem.c | |
| parent | s390: add missing include statements (diff) | |
| download | linux-dev-c34a69059d7876e0793eb410deedfb08ccb22b02.tar.xz linux-dev-c34a69059d7876e0793eb410deedfb08ccb22b02.zip | |
s390/vmem: fix identity mapping
The identity mapping is suboptimal for the last 2GB frame. The mapping
will be established with a mix of 4KB and 1MB mappings instead of a
single 2GB mapping.
This happens because of a off-by-one bug introduced with
commit 50be63450728 ("s390/mm: Convert bootmem to memblock").
Currently the identity mapping looks like this:
0x0000000080000000-0x0000000180000000 4G PUD RW
0x0000000180000000-0x00000001fff00000 2047M PMD RW
0x00000001fff00000-0x0000000200000000 1M PTE RW
With the bug fixed it looks like this:
0x0000000080000000-0x0000000200000000 6G PUD RW
Fixes: 50be63450728 ("s390/mm: Convert bootmem to memblock")
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/vmem.c')
| -rw-r--r-- | arch/s390/mm/vmem.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index d27fccbad7c1..f7ad6cd38e3e 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -370,7 +370,7 @@ void __init vmem_map_init(void) ro_end = (unsigned long)&_eshared & PAGE_MASK; for_each_memblock(memory, reg) { start = reg->base; - end = reg->base + reg->size - 1; + end = reg->base + reg->size; if (start >= ro_end || end <= ro_start) vmem_add_mem(start, end - start, 0); else if (start >= ro_start && end <= ro_end) |