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| author | Heiko Carstens <hca@linux.ibm.com> | 2021-08-24 15:21:44 +0200 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2021-08-25 11:03:34 +0200 |
| commit | c4f0e5cfde354b1d6cf2388c0920264985c6c139 (patch) | |
| tree | 20b2756b1da2350a4ac577382833d68eaf930025 /arch/s390 | |
| parent | 8b5f08b484bd948e1bedcd5a637a4f7609f1c7c1 (diff) | |
| download | linux-c4f0e5cfde354b1d6cf2388c0920264985c6c139.tar.gz | |
s390/mm,pageattr: fix walk_pte_level() early exit
In case of splitting to 4k mapping the early exit in walk_pte_level()
must only be taken iff flags is equal to SET_MEMORY_4K.
Currently the early exit is taken if the flag is set, and also others
might be set. This may lead to the situation that a mapping is split
but other changes are not done, like e.g. setting pages to R/W.
There is currently no such caller, but there might be in the future.
Fixes: b3e1a00c8fa4 ("s390/mm: implement set_memory_4k()")
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390')
| -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 45197b71d55f..fdc86c0e4e6c 100644 --- a/arch/s390/mm/pageattr.c +++ b/arch/s390/mm/pageattr.c @@ -86,7 +86,7 @@ static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end, { pte_t *ptep, new; - if ((flags & SET_MEMORY_4K) == SET_MEMORY_4K) + if (flags == SET_MEMORY_4K) return 0; ptep = pte_offset_kernel(pmdp, addr); do { |