Commit bffc2f7a authored Aug 21, 2020 by Vasily Gorbik

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: 3e0d3e40 ("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>

parent 1196f12a

arch/s390/mm/vmem.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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)

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