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s390/vmem: fix vmem_add_range for 4-level paging

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The kernel currently crashes if 4-level paging is used. Add missing
p4d_populate for just allocated pud entry.

Fixes: 3e0d3e408e ("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>
This commit is contained in:
Vasily Gorbik 2020-08-21 18:27:36 +02:00
parent 1196f12a2c
commit bffc2f7aa9
1 changed files with 1 additions and 0 deletions
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arch/s390/mm/vmem.c
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@ -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)