riscv: mm: WARN_ON() for bad addresses in vmemmap_populate()

Similarly to the same check in arch/arm64/mm/mmu.c, in
vmemmap_populate(), add a warning for start and end being outside of the
range of vmemmap.

Signed-off-by: Vivian Wang <wangruikang@iscas.ac.cn>
Link: https://patch.msgid.link/20260309-riscv-sparsemem-vmemmap-limits-v1-1-f40efe18e3cd@iscas.ac.cn
Signed-off-by: Paul Walmsley <pjw@kernel.org>

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 257df6b..2a34906 100644 (file)
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -1448,6 +1448,8 @@ int __meminit vmemmap_check_pmd(pmd_t *pmdp, int node,
 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
                               struct vmem_altmap *altmap)
 {
+       WARN_ON((start < VMEMMAP_START) || (end > VMEMMAP_END));
+
        /*
         * Note that SPARSEMEM_VMEMMAP is only selected for rv64 and that we
         * can't use hugepage mappings for 2-level page table because in case of