x86: clean up reserve_bootmem_generic() and port it to 32-bit

1. add reserve_bootmem_generic for 32bit
2. change len to unsigned long
3. make early_res_to_bootmem to use it
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/e820.c

@@ -635,7 +635,7 @@ void __init early_res_to_bootmem(u64 start, u64 end)
 			continue;
 		printk(KERN_INFO "  early res: %d [%llx-%llx] %s\n", i,
 			final_start, final_end - 1, r->name);
-		reserve_bootmem(final_start, final_end - final_start,
+		reserve_bootmem_generic(final_start, final_end - final_start,
 				BOOTMEM_DEFAULT);
 	}
 }

arch/x86/kernel/mpparse.c

@@ -859,10 +859,11 @@ static int __init smp_scan_config(unsigned long base, unsigned long length,
 
 			if (!reserve)
 				return 1;
-#ifdef CONFIG_X86_32
-			reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE,
+			reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE,
 					BOOTMEM_DEFAULT);
 			if (mpf->mpf_physptr) {
+				unsigned long size = PAGE_SIZE;
+#ifdef CONFIG_X86_32
 				/*
 				 * We cannot access to MPC table to compute
 				 * table size yet, as only few megabytes from
@@ -872,21 +873,14 @@ static int __init smp_scan_config(unsigned long base, unsigned long length,
 				 * PAGE_SIZE from mpg->mpf_physptr yields BUG()
 				 * in reserve_bootmem.
 				 */
-				unsigned long size = PAGE_SIZE;
 				unsigned long end = max_low_pfn * PAGE_SIZE;
 				if (mpf->mpf_physptr + size > end)
 					size = end - mpf->mpf_physptr;
-				reserve_bootmem(mpf->mpf_physptr, size,
+#endif
+				reserve_bootmem_generic(mpf->mpf_physptr, size,
 						BOOTMEM_DEFAULT);
 			}
 
-#else
-			reserve_bootmem_generic(virt_to_phys(mpf), PAGE_SIZE,
-				BOOTMEM_DEFAULT);
-			if (mpf->mpf_physptr)
-				reserve_bootmem_generic(mpf->mpf_physptr,
-					PAGE_SIZE, BOOTMEM_DEFAULT);
-#endif
 			return 1;
 		}
 		bp += 4;

arch/x86/mm/init_32.c

@@ -785,3 +785,9 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 	free_init_pages("initrd memory", start, end);
 }
 #endif
+
+int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
+				   int flags)
+{
+	return reserve_bootmem(phys, len, flags);
+}

arch/x86/mm/init_64.c

@@ -799,7 +799,8 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 }
 #endif
 
-int __init reserve_bootmem_generic(unsigned long phys, unsigned len, int flags)
+int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
+				   int flags)
 {
 #ifdef CONFIG_NUMA
 	int nid, next_nid;

include/asm-x86/proto.h

@@ -14,8 +14,6 @@ extern void ia32_syscall(void);
 extern void ia32_cstar_target(void);
 extern void ia32_sysenter_target(void);
 
-extern int reserve_bootmem_generic(unsigned long phys, unsigned len, int flags);
-
 extern void syscall32_cpu_init(void);
 
 extern void check_efer(void);

include/linux/bootmem.h

@@ -84,6 +84,8 @@ extern int reserve_bootmem(unsigned long addr, unsigned long size, int flags);
 	__alloc_bootmem_low(x, PAGE_SIZE, 0)
 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
 
+extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
+				   int flags);
 extern unsigned long free_all_bootmem(void);
 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
 extern void *__alloc_bootmem_node(pg_data_t *pgdat,