powerpc/book3e: Fix sparse report in mm/nohash/fsl_book3e.c

Make tlbcam_addrs[] static.

Declare TLBCAM[] in mm/mmu_decl.h

And use NULL instead of 0 as pointer when calling restore_to_as0().
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/fd0cc30b5556428ce1d8a1fc0f983b462e88a956.1647200488.git.christophe.leroy@csgroup.eu

arch/powerpc/mm/mmu_decl.h

@@ -155,6 +155,10 @@ struct tlbcam {
 	u32	MAS3;
 	u32	MAS7;
 };
+
+#define NUM_TLBCAMS	64
+
+extern struct tlbcam TLBCAM[NUM_TLBCAMS];
 #endif
 
 #if defined(CONFIG_PPC_BOOK3S_32) || defined(CONFIG_FSL_BOOKE) || defined(CONFIG_PPC_8xx)

arch/powerpc/mm/nohash/fsl_book3e.c

@@ -51,10 +51,9 @@
 
 unsigned int tlbcam_index;
 
-#define NUM_TLBCAMS	(64)
 struct tlbcam TLBCAM[NUM_TLBCAMS];
 
-struct tlbcamrange {
+static struct {
 	unsigned long start;
 	unsigned long limit;
 	phys_addr_t phys;
@@ -274,7 +273,7 @@ void __init adjust_total_lowmem(void)
 
 	i = switch_to_as1();
 	__max_low_memory = map_mem_in_cams(ram, CONFIG_LOWMEM_CAM_NUM, false, true);
-	restore_to_as0(i, 0, 0, 1);
+	restore_to_as0(i, 0, NULL, 1);
 
 	pr_info("Memory CAM mapping: ");
 	for (i = 0; i < tlbcam_index - 1; i++)