[PATCH 4/6] kcore register text area in generic way

[KAMEZAWA Hiroyuki]

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxx>
---
 arch/ia64/Kconfig     |    4 ++++
 arch/ia64/mm/init.c   |    2 --
 arch/x86/Kconfig      |    4 ++++
 arch/x86/mm/init_64.c |    4 +---
 fs/proc/kcore.c       |   19 ++++++++++++++++++-
 5 files changed, 27 insertions(+), 6 deletions(-)

Index: mmotm-2.6.31-Aug6/arch/x86/Kconfig
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/x86/Kconfig
+++ mmotm-2.6.31-Aug6/arch/x86/Kconfig
@@ -1201,6 +1201,10 @@ config ARCH_MEMORY_PROBE
 	def_bool X86_64
 	depends on MEMORY_HOTPLUG
 
+config ARCH_PROC_KCORE_TEXT
+	def_bool y
+	depends on X86_64 && PROC_KCORE
+
 config ILLEGAL_POINTER_VALUE
        hex
        default 0 if X86_32
Index: mmotm-2.6.31-Aug6/arch/ia64/Kconfig
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/ia64/Kconfig
+++ mmotm-2.6.31-Aug6/arch/ia64/Kconfig
@@ -496,6 +496,10 @@ 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
Index: mmotm-2.6.31-Aug6/arch/ia64/mm/init.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/ia64/mm/init.c
+++ mmotm-2.6.31-Aug6/arch/ia64/mm/init.c
@@ -617,7 +617,6 @@ mem_init (void)
 	long reserved_pages, codesize, datasize, initsize;
 	pg_data_t *pgdat;
 	int i;
-	static struct kcore_list kcore_kernel;
 
 	BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE);
 	BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE);
@@ -637,7 +636,6 @@ mem_init (void)
 	max_mapnr = max_low_pfn;
 #endif
 	high_memory = __va(max_low_pfn * PAGE_SIZE);
-	kclist_add(&kcore_kernel, _stext, _end - _stext, KCORE_TEXT);
 
 	for_each_online_pgdat(pgdat)
 		if (pgdat->bdata->node_bootmem_map)
Index: mmotm-2.6.31-Aug6/arch/x86/mm/init_64.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/x86/mm/init_64.c
+++ mmotm-2.6.31-Aug6/arch/x86/mm/init_64.c
@@ -647,8 +647,7 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to
 
 #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,
Index: mmotm-2.6.31-Aug6/fs/proc/kcore.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/fs/proc/kcore.c
+++ mmotm-2.6.31-Aug6/fs/proc/kcore.c
@@ -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 __use
 
 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;

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