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authorHeiko Carstens <heiko.carstens@de.ibm.com>2016-05-10 12:10:22 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-05-11 10:20:30 +0200
commitc34a69059d7876e0793eb410deedfb08ccb22b02 (patch)
tree18d24e5fd7a5f8e881467035e3e61368d1834adb /arch/s390/mm
parentca21872e43e82c2a5c2e056ee4aea40a921720b1 (diff)
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')
-rw-r--r--arch/s390/mm/vmem.c2
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)