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authorVasily Gorbik <gor@linux.ibm.com>2020-08-21 18:27:36 +0200
committerVasily Gorbik <gor@linux.ibm.com>2020-08-26 18:07:05 +0200
commitbffc2f7aa96343f91931272d7a8a2d8d925e1ab2 (patch)
tree855eed55c1c17572f79f94b60bef421601e28680 /arch/s390
parent1196f12a2c960951d02262af25af0bb1775ebcc2 (diff)
s390/vmem: fix vmem_add_range for 4-level paging
The kernel currently crashes if 4-level paging is used. Add missing p4d_populate for just allocated pud entry. Fixes: 3e0d3e408e63 ("s390/vmem: consolidate vmem_add_range() and vmem_remove_range()") Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/mm/vmem.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 1aed1a4dfc2d..eddf71c22875 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -402,6 +402,7 @@ static int modify_p4d_table(pgd_t *pgd, unsigned long addr, unsigned long end,
pud = vmem_crst_alloc(_REGION3_ENTRY_EMPTY);
if (!pud)
goto out;
+ p4d_populate(&init_mm, p4d, pud);
}
ret = modify_pud_table(p4d, addr, next, add, direct);
if (ret)