kexec: add BSS to resource tree

Add the BSS to the resource tree just as kernel text and kernel data are in
the resource tree.  The main reason behind this is to avoid crashkernel
reservation in that area.

While it's not strictly necessary to have the BSS in the resource tree (the
actual collision detection is done in the reserve_bootmem() function before),
the usage of the BSS resource should be presented to the user in /proc/iomem
just as Kernel data and Kernel code.

Note: The patch currently is only implemented for x86 and ia64 (because
efi_initialize_iomem_resources() has the same signature on i386 and ia64).

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Bernhard Walle <bwalle@suse.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Cc: <linux-arch@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 33 insertions, 5 deletions

diff --git a/arch/x86/kernel/e820_32.c b/arch/x86/kernel/e820_32.c
index 58fd54eb557..18f500d185a 100644
--- a/arch/x86/kernel/e820_32.c
+++ b/arch/x86/kernel/e820_32.c
@@ -51,6 +51,13 @@ struct resource code_resource = {
 	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
 };
 
+struct resource bss_resource = {
+	.name	= "Kernel bss",
+	.start	= 0,
+	.end	= 0,
+	.flags	= IORESOURCE_BUSY | IORESOURCE_MEM
+};
+
 static struct resource system_rom_resource = {
 	.name	= "System ROM",
 	.start	= 0xf0000,
@@ -254,7 +261,9 @@ static void __init probe_roms(void)
  * and also for regions reported as reserved by the e820.
  */
 static void __init
-legacy_init_iomem_resources(struct resource *code_resource, struct resource *data_resource)
+legacy_init_iomem_resources(struct resource *code_resource,
+			    struct resource *data_resource,
+			    struct resource *bss_resource)
 {
 	int i;
 
@@ -287,6 +296,7 @@ legacy_init_iomem_resources(struct resource *code_resource, struct resource *dat
 			 */
 			request_resource(res, code_resource);
 			request_resource(res, data_resource);
+			request_resource(res, bss_resource);
 #ifdef CONFIG_KEXEC
 			if (crashk_res.start != crashk_res.end)
 				request_resource(res, &crashk_res);
@@ -307,9 +317,11 @@ static int __init request_standard_resources(void)
 
 	printk("Setting up standard PCI resources\n");
 	if (efi_enabled)
-		efi_initialize_iomem_resources(&code_resource, &data_resource);
+		efi_initialize_iomem_resources(&code_resource,
+				&data_resource, &bss_resource);
 	else
-		legacy_init_iomem_resources(&code_resource, &data_resource);
+		legacy_init_iomem_resources(&code_resource,
+				&data_resource, &bss_resource);
 
 	/* EFI systems may still have VGA */
 	request_resource(&iomem_resource, &video_ram_resource);
diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
index 1ca228b06a2..04698e0b056 100644
--- a/arch/x86/kernel/e820_64.c
+++ b/arch/x86/kernel/e820_64.c
@@ -47,7 +47,7 @@ unsigned long end_pfn_map;
  */
 static unsigned long __initdata end_user_pfn = MAXMEM>>PAGE_SHIFT;
 
-extern struct resource code_resource, data_resource;
+extern struct resource code_resource, data_resource, bss_resource;
 
 /* Check for some hardcoded bad areas that early boot is not allowed to touch */ 
 static inline int bad_addr(unsigned long *addrp, unsigned long size)
@@ -225,6 +225,7 @@ void __init e820_reserve_resources(void)
 			 */
 			request_resource(res, &code_resource);
 			request_resource(res, &data_resource);
+			request_resource(res, &bss_resource);
 #ifdef CONFIG_KEXEC
 			if (crashk_res.start != crashk_res.end)
 				request_resource(res, &crashk_res);
diff --git a/arch/x86/kernel/efi_32.c b/arch/x86/kernel/efi_32.c
index b42558c48e9..e2be78f4939 100644
--- a/arch/x86/kernel/efi_32.c
+++ b/arch/x86/kernel/efi_32.c
@@ -603,7 +603,8 @@ void __init efi_enter_virtual_mode(void)
 
 void __init
 efi_initialize_iomem_resources(struct resource *code_resource,
-			       struct resource *data_resource)
+			       struct resource *data_resource,
+			       struct resource *bss_resource)
 {
 	struct resource *res;
 	efi_memory_desc_t *md;
@@ -675,6 +676,7 @@ efi_initialize_iomem_resources(struct resource *code_resource,
 		if (md->type == EFI_CONVENTIONAL_MEMORY) {
 			request_resource(res, code_resource);
 			request_resource(res, data_resource);
+			request_resource(res, bss_resource);
 #ifdef CONFIG_KEXEC
 			request_resource(res, &crashk_res);
 #endif
diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index ba2e165a8a0..cc0e91447b7 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -60,6 +60,7 @@
 #include <asm/vmi.h>
 #include <setup_arch.h>
 #include <bios_ebda.h>
+#include <asm/cacheflush.h>
 
 /* This value is set up by the early boot code to point to the value
    immediately after the boot time page tables.  It contains a *physical*
@@ -73,6 +74,7 @@ int disable_pse __devinitdata = 0;
  */
 extern struct resource code_resource;
 extern struct resource data_resource;
+extern struct resource bss_resource;
 
 /* cpu data as detected by the assembly code in head.S */
 struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
@@ -600,6 +602,8 @@ void __init setup_arch(char **cmdline_p)
 	code_resource.end = virt_to_phys(_etext)-1;
 	data_resource.start = virt_to_phys(_etext);
 	data_resource.end = virt_to_phys(_edata)-1;
+	bss_resource.start = virt_to_phys(&__bss_start);
+	bss_resource.end = virt_to_phys(&__bss_stop)-1;
 
 	parse_early_param();
 
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 31322d42eaa..e7a9e36bd52 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -58,6 +58,7 @@
 #include <asm/numa.h>
 #include <asm/sections.h>
 #include <asm/dmi.h>
+#include <asm/cacheflush.h>
 
 /*
  * Machine setup..
@@ -133,6 +134,12 @@ struct resource code_resource = {
 	.end = 0,
 	.flags = IORESOURCE_RAM,
 };
+struct resource bss_resource = {
+	.name = "Kernel bss",
+	.start = 0,
+	.end = 0,
+	.flags = IORESOURCE_RAM,
+};
 
 #ifdef CONFIG_PROC_VMCORE
 /* elfcorehdr= specifies the location of elf core header
@@ -276,6 +283,8 @@ void __init setup_arch(char **cmdline_p)
 	code_resource.end = virt_to_phys(&_etext)-1;
 	data_resource.start = virt_to_phys(&_etext);
 	data_resource.end = virt_to_phys(&_edata)-1;
+	bss_resource.start = virt_to_phys(&__bss_start);
+	bss_resource.end = virt_to_phys(&__bss_stop)-1;
 
 	early_identify_cpu(&boot_cpu_data);