ARM: move initialization of the high_memory variable earlier

Some upcoming changes must know the VMALLOC_START value, which is based
on high_memory, before bootmem_init() is called.

The best location to set it is in sanity_check_meminfo() where the needed
computation is already done, and in the non MMU case it is trivial to do
now that the meminfo array is already sorted at that point.
Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

arch/arm/mm/init.c

@@ -381,8 +381,6 @@ void __init bootmem_init(void)
 	 */
 	arm_bootmem_free(min, max_low, max_high);
 
-	high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1;
-
 	/*
 	 * This doesn't seem to be used by the Linux memory manager any
 	 * more, but is used by ll_rw_block.  If we can get rid of it, we

arch/arm/mm/mmu.c

@@ -860,6 +860,7 @@ void __init sanity_check_meminfo(void)
 	}
 #endif
 	meminfo.nr_banks = j;
+	high_memory = __va(lowmem_limit - 1) + 1;
 	memblock_set_current_limit(lowmem_limit);
 }
 

arch/arm/mm/nommu.c

@@ -29,6 +29,8 @@ void __init arm_mm_memblock_reserve(void)
 
 void __init sanity_check_meminfo(void)
 {
+	phys_addr_t end = bank_phys_end(&meminfo.bank[meminfo.nr_banks - 1]);
+	high_memory = __va(end - 1) + 1;
 }
 
 /*