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SubjectRe: [patch 1/3] Add BSS to resource tree
* Andrew Morton <akpm@linux-foundation.org> [2007-10-18 23:26]:
>
> > --- 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;
>
> As should these. afaik they're the same on all architectures and even if
> they have different names on some weird arch, an unused declaration won't
> hurt.

It's different on every architectures. Some don't have it at all (like
PPC64), and most of them have code_resource and data_resource static.
Instead of making the data on all architectures (that have it) global,
I'd like to make it static on x86.

See my attached patch.



Thanks,
Bernhard

---
[PATCH] Remove extern declarations for code/data/bss resource

This patch removes the extern struct resource declarations for
data_resource, code_resource and bss_resource on x86 and declares
that three structures as static as done on other architectures like IA64.

On i386, these structures are moved to setup_32.c (from e820_32.c) because
that's code that is not specific to e820 and also required on EFI systems.
That makes the "extern" reference superfluous.

On x86_64, data_resource, code_resource and bss_resource are passed to
e820_reserve_resources() as arguments just as done on i386 and IA64. That also
avoids the "extern" reference and it's possible to make it static.


Signed-off-by: Bernhard Walle <bwalle@suse.de>

---
arch/x86/kernel/e820_32.c | 49 --------------------
arch/x86/kernel/e820_64.c | 11 ++--
arch/x86/kernel/setup_32.c | 106 +++++++++++++++++++++++++++++++++++++++++++--
arch/x86/kernel/setup_64.c | 6 +-
4 files changed, 111 insertions(+), 61 deletions(-)
--- a/arch/x86/kernel/e820_32.c
+++ b/arch/x86/kernel/e820_32.c
@@ -37,26 +37,6 @@ unsigned long pci_mem_start = 0x10000000
EXPORT_SYMBOL(pci_mem_start);
#endif
extern int user_defined_memmap;
-struct resource data_resource = {
- .name = "Kernel data",
- .start = 0,
- .end = 0,
- .flags = IORESOURCE_BUSY | IORESOURCE_MEM
-};
-
-struct resource code_resource = {
- .name = "Kernel code",
- .start = 0,
- .end = 0,
- .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",
@@ -111,60 +91,6 @@ static struct resource video_rom_resourc
.flags = IORESOURCE_BUSY | IORESOURCE_READONLY | IORESOURCE_MEM
};

-static struct resource video_ram_resource = {
- .name = "Video RAM area",
- .start = 0xa0000,
- .end = 0xbffff,
- .flags = IORESOURCE_BUSY | IORESOURCE_MEM
-};
-
-static struct resource standard_io_resources[] = { {
- .name = "dma1",
- .start = 0x0000,
- .end = 0x001f,
- .flags = IORESOURCE_BUSY | IORESOURCE_IO
-}, {
- .name = "pic1",
- .start = 0x0020,
- .end = 0x0021,
- .flags = IORESOURCE_BUSY | IORESOURCE_IO
-}, {
- .name = "timer0",
- .start = 0x0040,
- .end = 0x0043,
- .flags = IORESOURCE_BUSY | IORESOURCE_IO
-}, {
- .name = "timer1",
- .start = 0x0050,
- .end = 0x0053,
- .flags = IORESOURCE_BUSY | IORESOURCE_IO
-}, {
- .name = "keyboard",
- .start = 0x0060,
- .end = 0x006f,
- .flags = IORESOURCE_BUSY | IORESOURCE_IO
-}, {
- .name = "dma page reg",
- .start = 0x0080,
- .end = 0x008f,
- .flags = IORESOURCE_BUSY | IORESOURCE_IO
-}, {
- .name = "pic2",
- .start = 0x00a0,
- .end = 0x00a1,
- .flags = IORESOURCE_BUSY | IORESOURCE_IO
-}, {
- .name = "dma2",
- .start = 0x00c0,
- .end = 0x00df,
- .flags = IORESOURCE_BUSY | IORESOURCE_IO
-}, {
- .name = "fpu",
- .start = 0x00f0,
- .end = 0x00ff,
- .flags = IORESOURCE_BUSY | IORESOURCE_IO
-} };
-
#define ROMSIGNATURE 0xaa55

static int __init romsignature(const unsigned char *rom)
@@ -260,10 +186,9 @@ static void __init probe_roms(void)
* Request address space for all standard RAM and ROM resources
* 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,
- struct resource *bss_resource)
+void __init legacy_init_iomem_resources(struct resource *code_resource,
+ struct resource *data_resource,
+ struct resource *bss_resource)
{
int i;

@@ -305,35 +230,6 @@ legacy_init_iomem_resources(struct resou
}
}

-/*
- * Request address space for all standard resources
- *
- * This is called just before pcibios_init(), which is also a
- * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
- */
-static int __init request_standard_resources(void)
-{
- int i;
-
- printk("Setting up standard PCI resources\n");
- if (efi_enabled)
- efi_initialize_iomem_resources(&code_resource,
- &data_resource, &bss_resource);
- else
- legacy_init_iomem_resources(&code_resource,
- &data_resource, &bss_resource);
-
- /* EFI systems may still have VGA */
- request_resource(&iomem_resource, &video_ram_resource);
-
- /* request I/O space for devices used on all i[345]86 PCs */
- for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
- request_resource(&ioport_resource, &standard_io_resources[i]);
- return 0;
-}
-
-subsys_initcall(request_standard_resources);
-
#if defined(CONFIG_PM) && defined(CONFIG_HIBERNATION)
/**
* e820_mark_nosave_regions - Find the ranges of physical addresses that do not
--- a/arch/x86/kernel/e820_64.c
+++ b/arch/x86/kernel/e820_64.c
@@ -47,8 +47,6 @@ unsigned long end_pfn_map;
*/
static unsigned long __initdata end_user_pfn = MAXMEM>>PAGE_SHIFT;

-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)
{
@@ -201,7 +199,8 @@ unsigned long __init e820_end_of_ram(voi
/*
* Mark e820 reserved areas as busy for the resource manager.
*/
-void __init e820_reserve_resources(void)
+void __init e820_reserve_resources(struct resource *code_resource,
+ struct resource *data_resource, struct resource *bss_resource)
{
int i;
for (i = 0; i < e820.nr_map; i++) {
@@ -223,9 +222,9 @@ void __init e820_reserve_resources(void)
* so we try it repeatedly and let the resource manager
* test it.
*/
- request_resource(res, &code_resource);
- request_resource(res, &data_resource);
- request_resource(res, &bss_resource);
+ 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);
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -72,9 +72,80 @@ int disable_pse __devinitdata = 0;
/*
* Machine setup..
*/
-extern struct resource code_resource;
-extern struct resource data_resource;
-extern struct resource bss_resource;
+static struct resource data_resource = {
+ .name = "Kernel data",
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_BUSY | IORESOURCE_MEM
+};
+
+static struct resource code_resource = {
+ .name = "Kernel code",
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_BUSY | IORESOURCE_MEM
+};
+
+static struct resource bss_resource = {
+ .name = "Kernel bss",
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_BUSY | IORESOURCE_MEM
+};
+
+static struct resource video_ram_resource = {
+ .name = "Video RAM area",
+ .start = 0xa0000,
+ .end = 0xbffff,
+ .flags = IORESOURCE_BUSY | IORESOURCE_MEM
+};
+
+static struct resource standard_io_resources[] = { {
+ .name = "dma1",
+ .start = 0x0000,
+ .end = 0x001f,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO
+}, {
+ .name = "pic1",
+ .start = 0x0020,
+ .end = 0x0021,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO
+}, {
+ .name = "timer0",
+ .start = 0x0040,
+ .end = 0x0043,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO
+}, {
+ .name = "timer1",
+ .start = 0x0050,
+ .end = 0x0053,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO
+}, {
+ .name = "keyboard",
+ .start = 0x0060,
+ .end = 0x006f,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO
+}, {
+ .name = "dma page reg",
+ .start = 0x0080,
+ .end = 0x008f,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO
+}, {
+ .name = "pic2",
+ .start = 0x00a0,
+ .end = 0x00a1,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO
+}, {
+ .name = "dma2",
+ .start = 0x00c0,
+ .end = 0x00df,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO
+}, {
+ .name = "fpu",
+ .start = 0x00f0,
+ .end = 0x00ff,
+ .flags = IORESOURCE_BUSY | IORESOURCE_IO
+} };

/* 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 };
@@ -706,3 +777,32 @@ void __init setup_arch(char **cmdline_p)
#endif
#endif
}
+
+/*
+ * Request address space for all standard resources
+ *
+ * This is called just before pcibios_init(), which is also a
+ * subsys_initcall, but is linked in later (in arch/i386/pci/common.c).
+ */
+static int __init request_standard_resources(void)
+{
+ int i;
+
+ printk(KERN_INFO "Setting up standard PCI resources\n");
+ if (efi_enabled)
+ efi_initialize_iomem_resources(&code_resource,
+ &data_resource, &bss_resource);
+ else
+ legacy_init_iomem_resources(&code_resource,
+ &data_resource, &bss_resource);
+
+ /* EFI systems may still have VGA */
+ request_resource(&iomem_resource, &video_ram_resource);
+
+ /* request I/O space for devices used on all i[345]86 PCs */
+ for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
+ request_resource(&ioport_resource, &standard_io_resources[i]);
+ return 0;
+}
+
+subsys_initcall(request_standard_resources);
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -122,19 +122,19 @@ struct resource standard_io_resources[]

#define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)

-struct resource data_resource = {
+static struct resource data_resource = {
.name = "Kernel data",
.start = 0,
.end = 0,
.flags = IORESOURCE_RAM,
};
-struct resource code_resource = {
+static struct resource code_resource = {
.name = "Kernel code",
.start = 0,
.end = 0,
.flags = IORESOURCE_RAM,
};
-struct resource bss_resource = {
+static struct resource bss_resource = {
.name = "Kernel bss",
.start = 0,
.end = 0,
@@ -437,7 +437,7 @@ void __init setup_arch(char **cmdline_p)
/*
* We trust e820 completely. No explicit ROM probing in memory.
*/
- e820_reserve_resources();
+ e820_reserve_resources(&code_resource, &data_resource, &bss_resource);
e820_mark_nosave_regions();

{
--- a/include/asm-x86/e820_32.h
+++ b/include/asm-x86/e820_32.h
@@ -12,6 +12,8 @@
#ifndef __E820_HEADER
#define __E820_HEADER

+#include <linux/ioport.h>
+
#define E820MAP 0x2d0 /* our map */
#define E820MAX 128 /* number of entries in E820MAP */
#define E820NR 0x1e8 /* # entries in E820MAP */
@@ -46,6 +48,9 @@ extern void register_bootmem_low_pages(u
extern void e820_register_memory(void);
extern void limit_regions(unsigned long long size);
extern void print_memory_map(char *who);
+extern void legacy_init_iomem_resources(struct resource *code_resource,
+ struct resource *data_resource,
+ struct resource *bss_resource);

#if defined(CONFIG_PM) && defined(CONFIG_HIBERNATION)
extern void e820_mark_nosave_regions(void);
@@ -55,6 +60,7 @@ static inline void e820_mark_nosave_regi
}
#endif

+
#endif/*!__ASSEMBLY__*/

#endif/*__E820_HEADER*/
--- a/include/asm-x86/e820_64.h
+++ b/include/asm-x86/e820_64.h
@@ -11,6 +11,8 @@
#ifndef __E820_HEADER
#define __E820_HEADER

+#include <linux/ioport.h>
+
#define E820MAP 0x2d0 /* our map */
#define E820MAX 128 /* number of entries in E820MAP */
#define E820NR 0x1e8 /* # entries in E820MAP */
@@ -39,7 +41,8 @@ extern void add_memory_region(unsigned l
extern void setup_memory_region(void);
extern void contig_e820_setup(void);
extern unsigned long e820_end_of_ram(void);
-extern void e820_reserve_resources(void);
+extern void e820_reserve_resources(struct resource *code_resource,
+ struct resource *data_resource, struct resource *bss_resource);
extern void e820_mark_nosave_regions(void);
extern void e820_print_map(char *who);
extern int e820_any_mapped(unsigned long start, unsigned long end, unsigned type);
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -8,6 +8,7 @@
#ifndef _LINUX_IOPORT_H
#define _LINUX_IOPORT_H

+#ifndef __ASSEMBLY__
#include <linux/compiler.h>
#include <linux/types.h>
/*
@@ -153,4 +154,5 @@ extern struct resource * __devm_request_
extern void __devm_release_region(struct device *dev, struct resource *parent,
resource_size_t start, resource_size_t n);

+#endif /* __ASSEMBLY__ */
#endif /* _LINUX_IOPORT_H */
-
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