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| author |   Alexander Gordeev <agordeev@linux.ibm.com> | 2023-07-06 12:28:17 +0200 |
|---|---|---|
| committer |   Heiko Carstens <hca@linux.ibm.com> | 2023-08-16 15:13:02 +0200 |
| commit | 8ddccc8a7d06f7ea4d8579970c95609d1b1de77b (patch) | |
| tree | 582f01214e1f4a8da3c4f945a68c660c741db2b7 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | s390: remove <asm/export.h> (diff) | |
| download | wireguard-linux-8ddccc8a7d06f7ea4d8579970c95609d1b1de77b.tar.xz wireguard-linux-8ddccc8a7d06f7ea4d8579970c95609d1b1de77b.zip | |
s390/boot: cleanup number of page table levels setup
The separate vmalloc area size check against _REGION2_SIZE
is needed in case user provided insanely large value using
vmalloc= kernel command line parameter. That could lead to
overflow and selecting 3 page table levels instead of 4.
Use size_add() for the overflow check and get rid of the
extra vmalloc area check.
With the current values of CONFIG_MAX_PHYSMEM_BITS and
PAGES_PER_SECTION the sum of maximal possible size of
identity mapping and vmemmap area (derived from these
macros) plus modules area size MODULES_LEN can not
overflow. Thus, that sum is used as first addend while
vmalloc area size is second addend for size_add().
Suggested-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions