s390/mm,ptdump: hold cpa mutex while walking for kernel page table dump

Browse source

This is currently only preventing that outdated information is
provided to user space. A concurrent split of huge/large pages does
modify the kernel page tables, however either the huge/large mapping
is reported or the split area is being walked.

This "fixes" also only a potential future bug, since split pages could
also be merged again if page permissions are the same for larger
memory areas.

Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

...

This commit is contained in:

Heiko Carstens 2020-09-07 17:20:05 +02:00 • committed by Vasily Gorbik

parent 36c2733c43

commit da1694ad9e

3 changed files with 8 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

4

arch/s390/include/asm/set_memory.h

View file

3

arch/s390/mm/dump_pagetables.c

View file

2

arch/s390/mm/pageattr.c

View file