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kcore: register text area in generic way

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Some 64bit arch has special segment for mapping kernel text.  It should be
entried to /proc/kcore in addtion to direct-linear-map, vmalloc area.
This patch unifies KCORE_TEXT entry scattered under x86 and ia64.

I'm not familiar with other archs (mips has its own even after this patch)
but range of [_stext ..._end) is a valid area of text and it's not in
direct-map area, defining CONFIG_ARCH_PROC_KCORE_TEXT is only a necessary
thing to do.

Note: I left mips as it is now.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2009-09-22 16:45:45 -07:00 committed by Linus Torvalds
parent a0614da88b
commit 9492587cf3
5 changed files with 28 additions and 6 deletions
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4
arch/ia64/Kconfig
View File

@ -500,6 +500,10 @@ config HAVE_ARCH_NODEDATA_EXTENSION
def_bool y
depends on NUMA
config ARCH_PROC_KCORE_TEXT
def_bool y
depends on PROC_KCORE
config IA32_SUPPORT
bool "Support for Linux/x86 binaries"
help

3
arch/ia64/mm/init.c
View File

@ -617,7 +617,7 @@ mem_init (void)
long reserved_pages, codesize, datasize, initsize;
pg_data_t *pgdat;
int i;
static struct kcore_list kcore_mem, kcore_kernel;
static struct kcore_list kcore_mem;
BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE);
BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE);
@ -640,7 +640,6 @@ mem_init (void)
high_memory = __va(max_low_pfn * PAGE_SIZE);
kclist_add(&kcore_mem, __va(0), max_low_pfn * PAGE_SIZE, KCORE_RAM);
kclist_add(&kcore_kernel, _stext, _end - _stext, KCORE_TEXT);
for_each_online_pgdat(pgdat)
if (pgdat->bdata->node_bootmem_map)

4
arch/x86/Kconfig
View File

@ -1204,6 +1204,10 @@ config ARCH_DISCONTIGMEM_DEFAULT
def_bool y
depends on NUMA && X86_32
config ARCH_PROC_KCORE_TEXT
def_bool y
depends on X86_64 && PROC_KCORE
config ARCH_SPARSEMEM_DEFAULT
def_bool y
depends on X86_64

4
arch/x86/mm/init_64.c
View File

@ -647,8 +647,7 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif /* CONFIG_MEMORY_HOTPLUG */
static struct kcore_list kcore_mem, kcore_kernel,
kcore_modules, kcore_vsyscall;
static struct kcore_list kcore_mem, kcore_modules, kcore_vsyscall;
void __init mem_init(void)
{
@ -678,7 +677,6 @@ void __init mem_init(void)
/* Register memory areas for /proc/kcore */
kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
kclist_add(&kcore_kernel, &_stext, _end - _stext, KCORE_TEXT);
kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN,
KCORE_OTHER);
kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,

19
fs/proc/kcore.c
View File

@ -21,6 +21,7 @@
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/list.h>
#include <asm/sections.h>
#define CORE_STR "CORE"
@ -374,10 +375,26 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
static struct kcore_list kcore_vmalloc;
#ifdef CONFIG_ARCH_PROC_KCORE_TEXT
static struct kcore_list kcore_text;
/*
* If defined, special segment is used for mapping kernel text instead of
* direct-map area. We need to create special TEXT section.
*/
static void __init proc_kcore_text_init(void)
{
kclist_add(&kcore_text, _stext, _end - _stext, KCORE_TEXT);
}
#else
static void __init proc_kcore_text_init(void)
{
}
#endif
static int __init proc_kcore_init(void)
{
proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
proc_kcore_text_init();
kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
VMALLOC_END - VMALLOC_START, KCORE_VMALLOC);
return 0;