diff options
| author | Heiko Carstens <hca@linux.ibm.com> | 2020-09-07 18:20:05 +0300 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2020-09-14 12:38:34 +0300 |
| commit | da1694ad9e8d13484c8b4ecaabde0bd7b958442a (patch) | |
| tree | bd504d95a0fa035b362274044c6a0f1441b593d0 /arch/s390/mm/pageattr.c | |
| parent | 36c2733c439caa424fe2b7dded870913dcb868ac (diff) | |
| download | linux-da1694ad9e8d13484c8b4ecaabde0bd7b958442a.tar.xz | |
s390/mm,ptdump: hold cpa mutex while walking for kernel page table dump
This is currently only preventing that outdated information is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>
Diffstat (limited to 'arch/s390/mm/pageattr.c')
| -rw-r--r-- | arch/s390/mm/pageattr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c index c5c52ec2b46f..ed8e5b3575d5 100644 --- a/arch/s390/mm/pageattr.c +++ b/arch/s390/mm/pageattr.c @@ -278,7 +278,7 @@ static int walk_p4d_level(pgd_t *pgd, unsigned long addr, unsigned long end, return rc; } -static DEFINE_MUTEX(cpa_mutex); +DEFINE_MUTEX(cpa_mutex); static int change_page_attr(unsigned long addr, unsigned long end, unsigned long flags) |