powerpc/book3s/32: fix number of bats in p/v_block_mapped()

BugLink: https://bugs.launchpad.net/bugs/1855313

[ Upstream commit e93ba1b7 ]

This patch fixes the loop in p_block_mapped() and v_block_mapped()
to scan the entire bat_addrs[] array.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

arch/powerpc/mm/ppc_mmu_32.c

@@ -52,7 +52,7 @@ struct batrange {		/* stores address ranges mapped by BATs */
 phys_addr_t v_mapped_by_bats(unsigned long va)
 {
 	int b;
-	for (b = 0; b < 4; ++b)
+	for (b = 0; b < ARRAY_SIZE(bat_addrs); ++b)
 		if (va >= bat_addrs[b].start && va < bat_addrs[b].limit)
 			return bat_addrs[b].phys + (va - bat_addrs[b].start);
 	return 0;
@@ -64,7 +64,7 @@ phys_addr_t v_mapped_by_bats(unsigned long va)
 unsigned long p_mapped_by_bats(phys_addr_t pa)
 {
 	int b;
-	for (b = 0; b < 4; ++b)
+	for (b = 0; b < ARRAY_SIZE(bat_addrs); ++b)
 		if (pa >= bat_addrs[b].phys
 	    	    && pa < (bat_addrs[b].limit-bat_addrs[b].start)
 		              +bat_addrs[b].phys)