riscv: add __init section marker to some functions

They are not needed after booting, so mark them as __init to move them
to the __init section.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
index 28f4d52..4fa412a 100644
--- a/arch/riscv/mm/kasan_init.c
+++ b/arch/riscv/mm/kasan_init.c
@@ -48,7 +48,7 @@ asmlinkage void __init kasan_early_init(void)
 	local_flush_tlb_all();
 }
 
-static void kasan_populate_pte(pmd_t *pmd, unsigned long vaddr, unsigned long end)
+static void __init kasan_populate_pte(pmd_t *pmd, unsigned long vaddr, unsigned long end)
 {
 	phys_addr_t phys_addr;
 	pte_t *ptep, *base_pte;
@@ -70,7 +70,7 @@ static void kasan_populate_pte(pmd_t *pmd, unsigned long vaddr, unsigned long en
 	set_pmd(pmd, pfn_pmd(PFN_DOWN(__pa(base_pte)), PAGE_TABLE));
 }
 
-static void kasan_populate_pmd(pgd_t *pgd, unsigned long vaddr, unsigned long end)
+static void __init kasan_populate_pmd(pgd_t *pgd, unsigned long vaddr, unsigned long end)
 {
 	phys_addr_t phys_addr;
 	pmd_t *pmdp, *base_pmd;
@@ -105,7 +105,7 @@ static void kasan_populate_pmd(pgd_t *pgd, unsigned long vaddr, unsigned long en
 	set_pgd(pgd, pfn_pgd(PFN_DOWN(__pa(base_pmd)), PAGE_TABLE));
 }
 
-static void kasan_populate_pgd(unsigned long vaddr, unsigned long end)
+static void __init kasan_populate_pgd(unsigned long vaddr, unsigned long end)
 {
 	phys_addr_t phys_addr;
 	pgd_t *pgdp = pgd_offset_k(vaddr);