x86: unify crashkernel reservation for 32 and 64 bit

This patch moves the reserve_crashkernel() to setup.c and removes the
architecture-specific version. Both versions were more or less the same.

I tested it on both x86-64 and i386, with CONFIG_KEXEC on and off (so
that it compiles).

Signed-off-by: Bernhard Walle <bwalle@suse.de>
Cc: yhlu.kernel@gmail.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/setup.c

@@ -3,6 +3,7 @@
 #include <linux/init.h>
 #include <linux/bootmem.h>
 #include <linux/percpu.h>
+#include <linux/kexec.h>
 #include <asm/smp.h>
 #include <asm/percpu.h>
 #include <asm/sections.h>
@@ -11,6 +12,7 @@
 #include <asm/topology.h>
 #include <asm/mpspec.h>
 #include <asm/apicdef.h>
+#include <asm/highmem.h>
 
 #ifdef CONFIG_X86_LOCAL_APIC
 unsigned int num_processors;
@@ -404,3 +406,62 @@ EXPORT_SYMBOL(node_to_cpumask);
 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
 
 #endif /* X86_64_NUMA */
+
+
+/*
+ * --------- Crashkernel reservation ------------------------------
+ */
+
+static inline unsigned long long get_total_mem(void)
+{
+	unsigned long long total;
+
+	total = max_low_pfn - min_low_pfn;
+#ifdef CONFIG_HIGHMEM
+	total += highend_pfn - highstart_pfn;
+#endif
+
+	return total << PAGE_SHIFT;
+}
+
+#ifdef CONFIG_KEXEC
+void __init reserve_crashkernel(void)
+{
+	unsigned long long total_mem;
+	unsigned long long crash_size, crash_base;
+	int ret;
+
+	total_mem = get_total_mem();
+
+	ret = parse_crashkernel(boot_command_line, total_mem,
+			&crash_size, &crash_base);
+	if (ret == 0 && crash_size > 0) {
+		if (crash_base <= 0) {
+			printk(KERN_INFO "crashkernel reservation failed - "
+					"you have to specify a base address\n");
+			return;
+		}
+
+		if (reserve_bootmem_generic(crash_base, crash_size,
+					BOOTMEM_EXCLUSIVE) < 0) {
+			printk(KERN_INFO "crashkernel reservation failed - "
+					"memory is in use\n");
+			return;
+		}
+
+		printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
+				"for crashkernel (System RAM: %ldMB)\n",
+				(unsigned long)(crash_size >> 20),
+				(unsigned long)(crash_base >> 20),
+				(unsigned long)(total_mem >> 20));
+
+		crashk_res.start = crash_base;
+		crashk_res.end   = crash_base + crash_size - 1;
+		insert_resource(&iomem_resource, &crashk_res);
+	}
+}
+#else
+void __init reserve_crashkernel(void)
+{}
+#endif
+

arch/x86/kernel/setup_32.c

@@ -429,59 +429,6 @@ extern unsigned long __init setup_memory(void);
 extern void zone_sizes_init(void);
 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 
-static inline unsigned long long get_total_mem(void)
-{
-	unsigned long long total;
-
-	total = max_low_pfn - min_low_pfn;
-#ifdef CONFIG_HIGHMEM
-	total += highend_pfn - highstart_pfn;
-#endif
-
-	return total << PAGE_SHIFT;
-}
-
-#ifdef CONFIG_KEXEC
-static void __init reserve_crashkernel(void)
-{
-	unsigned long long total_mem;
-	unsigned long long crash_size, crash_base;
-	int ret;
-
-	total_mem = get_total_mem();
-
-	ret = parse_crashkernel(boot_command_line, total_mem,
-			&crash_size, &crash_base);
-	if (ret == 0 && crash_size > 0) {
-		if (crash_base <= 0) {
-			printk(KERN_INFO "crashkernel reservation failed - "
-					"you have to specify a base address\n");
-			return;
-		}
-
-		if (reserve_bootmem_generic(crash_base, crash_size,
-					BOOTMEM_EXCLUSIVE) < 0) {
-			printk(KERN_INFO "crashkernel reservation failed - "
-					"memory is in use\n");
-			return;
-		}
-
-		printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
-				"for crashkernel (System RAM: %ldMB)\n",
-				(unsigned long)(crash_size >> 20),
-				(unsigned long)(crash_base >> 20),
-				(unsigned long)(total_mem >> 20));
-
-		crashk_res.start = crash_base;
-		crashk_res.end   = crash_base + crash_size - 1;
-		insert_resource(&iomem_resource, &crashk_res);
-	}
-}
-#else
-static inline void __init reserve_crashkernel(void)
-{}
-#endif
-
 #ifdef CONFIG_BLK_DEV_INITRD
 
 static bool do_relocate_initrd = false;

arch/x86/kernel/setup_64.c

@@ -228,46 +228,6 @@ static inline void copy_edd(void)
 }
 #endif
 
-#ifdef CONFIG_KEXEC
-static void __init reserve_crashkernel(void)
-{
-	unsigned long long total_mem;
-	unsigned long long crash_size, crash_base;
-	int ret;
-
-	total_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
-
-	ret = parse_crashkernel(boot_command_line, total_mem,
-			&crash_size, &crash_base);
-	if (ret == 0 && crash_size) {
-		if (crash_base <= 0) {
-			printk(KERN_INFO "crashkernel reservation failed - "
-					"you have to specify a base address\n");
-			return;
-		}
-
-		if (reserve_bootmem_generic(crash_base, crash_size,
-					BOOTMEM_EXCLUSIVE) < 0) {
-			printk(KERN_INFO "crashkernel reservation failed - "
-					"memory is in use\n");
-			return;
-		}
-
-		printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
-				"for crashkernel (System RAM: %ldMB)\n",
-				(unsigned long)(crash_size >> 20),
-				(unsigned long)(crash_base >> 20),
-				(unsigned long)(total_mem >> 20));
-		crashk_res.start = crash_base;
-		crashk_res.end   = crash_base + crash_size - 1;
-		insert_resource(&iomem_resource, &crashk_res);
-	}
-}
-#else
-static inline void __init reserve_crashkernel(void)
-{}
-#endif
-
 /*
  * setup_arch - architecture-specific boot-time initializations
  *

include/asm-x86/setup.h

@@ -8,6 +8,9 @@
 /* Interrupt control for vSMPowered x86_64 systems */
 void vsmp_init(void);
 
+/* Crashkernel reservation */
+void reserve_crashkernel(void);
+
 #ifndef CONFIG_PARAVIRT
 #define paravirt_post_allocator_init()	do {} while (0)
 #endif