x86: extend e820 early_res support 32bit -fix #5

reserve early numa kva, so it will not clash with new RAMDISK
Signed-off-by: NYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/setup_32.c

@@ -614,7 +614,6 @@ void __init setup_bootmem_allocator(void)
 	 */
 	find_smp_config();
 #endif
-	numa_kva_reserve();
 	reserve_crashkernel();
 
 	reserve_ibft_region();

arch/x86/mm/discontig_32.c

@@ -357,6 +357,11 @@ unsigned long __init setup_memory(void)
 	printk("kva_start_pfn ~ %ld find_max_low_pfn() ~ %ld\n",
 		kva_start_pfn, max_low_pfn);
 	printk("max_pfn = %ld\n", max_pfn);
+
+	/* avoid clash with initrd */
+	reserve_early(kva_start_pfn<<PAGE_SHIFT,
+		      (kva_start_pfn + kva_pages)<<PAGE_SHIFT,
+		     "KVA PG");
 #ifdef CONFIG_HIGHMEM
 	highstart_pfn = highend_pfn = max_pfn;
 	if (max_pfn > system_max_low_pfn)
@@ -392,13 +397,6 @@ unsigned long __init setup_memory(void)
 	return max_low_pfn;
 }
 
-void __init numa_kva_reserve(void)
-{
-	if (kva_pages)
-		reserve_bootmem(PFN_PHYS(kva_start_pfn), PFN_PHYS(kva_pages),
-				BOOTMEM_DEFAULT);
-}
-
 void __init zone_sizes_init(void)
 {
 	int nid;

include/asm-x86/mmzone_32.h

@@ -38,16 +38,12 @@ static inline void get_memcfg_numa(void)
 }
 
 extern int early_pfn_to_nid(unsigned long pfn);
-extern void numa_kva_reserve(void);
 
 #else /* !CONFIG_NUMA */
 
 #define get_memcfg_numa get_memcfg_numa_flat
 #define get_zholes_size(n) (0)
 
-static inline void numa_kva_reserve(void)
-{
-}
 #endif /* CONFIG_NUMA */
 
 #ifdef CONFIG_DISCONTIGMEM