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crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn

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The Xen PV drivers in a crashed HVM guest can not connect to the dom0
backend drivers because both frontend and backend drivers are still in
connected state.  To run the connection reset function only in case of a
crashdump, the is_kdump_kernel() function needs to be available for the PV
driver modules.

Consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn into
kernel/crash_dump.c Also export elfcorehdr_addr to make is_kdump_kernel()
usable for modules.

Leave 'elfcorehdr' as early_param().  This changes powerpc from __setup()
to early_param().  It adds an address range check from x86 also on ia64
and powerpc.

[akpm@linux-foundation.org: additional #includes]
[akpm@linux-foundation.org: remove elfcorehdr_addr export]
[akpm@linux-foundation.org: fix for Tejun's mm/nobootmem.c changes]
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Olaf Hering 2011-03-23 16:43:29 -07:00 committed by Linus Torvalds
parent 8547727756
commit 93a72052be
16 changed files with 37 additions and 135 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/kernel/crash_dump.c
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@ -18,9 +18,6 @@
#include <linux/uaccess.h>
#include <linux/io.h>
/* stores the physical address of elf header of crash image */
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
/**
* copy_oldmem_page() - copy one page from old kernel memory
* @pfn: page frame number to be copied

24
arch/arm/kernel/setup.c
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@ -788,30 +788,6 @@ static void __init reserve_crashkernel(void)
static inline void reserve_crashkernel(void) {}
#endif /* CONFIG_KEXEC */
/*
* Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
* is_kdump_kernel() to determine if we are booting after a panic. Hence
* ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
*/
#ifdef CONFIG_CRASH_DUMP
/*
* elfcorehdr= specifies the location of elf core header stored by the crashed
* kernel. This option will be passed by kexec loader to the capture kernel.
*/
static int __init setup_elfcorehdr(char *arg)
{
char *end;
if (!arg)
return -EINVAL;
elfcorehdr_addr = memparse(arg, &end);
return end > arg ? 0 : -EINVAL;
}
early_param("elfcorehdr", setup_elfcorehdr);
#endif /* CONFIG_CRASH_DUMP */
static void __init squash_mem_tags(struct tag *tag)
{
for (; tag->hdr.size; tag = tag_next(tag))

3
arch/ia64/kernel/crash_dump.c
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@ -13,9 +13,6 @@
#include <asm/page.h>
#include <asm/uaccess.h>
/* Stores the physical address of elf header of crash image. */
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
/**
* copy_oldmem_page - copy one page from "oldmem"
* @pfn: page frame number to be copied

1
arch/ia64/kernel/efi.c
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@ -23,6 +23,7 @@
*/
#include <linux/module.h>
#include <linux/bootmem.h>
#include <linux/crash_dump.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>

18
arch/ia64/kernel/setup.c
View File

@ -479,25 +479,7 @@ static __init int setup_nomca(char *s)
}
early_param("nomca", setup_nomca);
/*
* Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
* is_kdump_kernel() to determine if we are booting after a panic. Hence
* ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
*/
#ifdef CONFIG_CRASH_DUMP
/* elfcorehdr= specifies the location of elf core header
* stored by the crashed kernel.
*/
static int __init parse_elfcorehdr(char *arg)
{
if (!arg)
return -EINVAL;
elfcorehdr_addr = memparse(arg, &arg);
return 0;
}
early_param("elfcorehdr", parse_elfcorehdr);
int __init reserve_elfcorehdr(u64 *start, u64 *end)
{
u64 length;

17
arch/powerpc/kernel/crash_dump.c
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@ -28,9 +28,6 @@
#define DBG(fmt...)
#endif
/* Stores the physical address of elf header of crash image. */
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
#ifndef CONFIG_RELOCATABLE
void __init reserve_kdump_trampoline(void)
{
@ -72,20 +69,6 @@ void __init setup_kdump_trampoline(void)
}
#endif /* CONFIG_RELOCATABLE */
/*
* Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
* is_kdump_kernel() to determine if we are booting after a panic. Hence
* ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
*/
static int __init parse_elfcorehdr(char *p)
{
if (p)
elfcorehdr_addr = memparse(p, &p);
return 1;
}
__setup("elfcorehdr=", parse_elfcorehdr);
static int __init parse_savemaxmem(char *p)
{
if (p)

22
arch/sh/kernel/crash_dump.c
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@ -9,28 +9,6 @@
#include <linux/io.h>
#include <asm/uaccess.h>
/* Stores the physical address of elf header of crash image. */
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
/*
* Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
* is_kdump_kernel() to determine if we are booting after a panic. Hence
* ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
*
* elfcorehdr= specifies the location of elf core header
* stored by the crashed kernel.
*/
static int __init parse_elfcorehdr(char *arg)
{
if (!arg)
return -EINVAL;
elfcorehdr_addr = memparse(arg, &arg);
return 0;
}
early_param("elfcorehdr", parse_elfcorehdr);
/**
* copy_oldmem_page - copy one page from "oldmem"
* @pfn: page frame number to be copied

3
arch/x86/kernel/crash_dump_32.c
View File

@ -14,9 +14,6 @@
static void *kdump_buf_page;
/* Stores the physical address of elf header of crash image. */
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
static inline bool is_crashed_pfn_valid(unsigned long pfn)
{
#ifndef CONFIG_X86_PAE

3
arch/x86/kernel/crash_dump_64.c
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@ -10,9 +10,6 @@
#include <linux/uaccess.h>
#include <linux/io.h>
/* Stores the physical address of elf header of crash image. */
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
/**
* copy_oldmem_page - copy one page from "oldmem"
* @pfn: page frame number to be copied

1
arch/x86/kernel/e820.c
View File

@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/crash_dump.h>
#include <linux/bootmem.h>
#include <linux/pfn.h>
#include <linux/suspend.h>

22
arch/x86/kernel/setup.c
View File

@ -619,28 +619,6 @@ void __init reserve_standard_io_resources(void)
}
/*
* Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
* is_kdump_kernel() to determine if we are booting after a panic. Hence
* ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
*/
#ifdef CONFIG_CRASH_DUMP
/* elfcorehdr= specifies the location of elf core header
* stored by the crashed kernel. This option will be passed
* by kexec loader to the capture kernel.
*/
static int __init setup_elfcorehdr(char *arg)
{
char *end;
if (!arg)
return -EINVAL;
elfcorehdr_addr = memparse(arg, &end);
return end > arg ? 0 : -EINVAL;
}
early_param("elfcorehdr", setup_elfcorehdr);
#endif
static __init void reserve_ibft_region(void)
{
unsigned long addr, size = 0;

4
include/linux/bootmem.h
View File

@ -19,10 +19,6 @@ extern unsigned long min_low_pfn;
*/
extern unsigned long max_pfn;
#ifdef CONFIG_CRASH_DUMP
extern unsigned long saved_max_pfn;
#endif
#ifndef CONFIG_NO_BOOTMEM
/*
* node_bootmem_map is a map pointer - the bits represent all physical

1
kernel/Makefile
View File

@ -107,6 +107,7 @@ obj-$(CONFIG_PERF_EVENTS) += perf_event.o
obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o
obj-$(CONFIG_PADATA) += padata.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
# According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is

34
kernel/crash_dump.c Normal file
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@ -0,0 +1,34 @@
#include <linux/kernel.h>
#include <linux/crash_dump.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/module.h>
/*
* If we have booted due to a crash, max_pfn will be a very low value. We need
* to know the amount of memory that the previous kernel used.
*/
unsigned long saved_max_pfn;
/*
* stores the physical address of elf header of crash image
*
* Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
* is_kdump_kernel() to determine if we are booting after a panic. Hence put
* it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
*/
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
/*
* elfcorehdr= specifies the location of elf core header stored by the crashed
* kernel. This option will be passed by kexec loader to the capture kernel.
*/
static int __init setup_elfcorehdr(char *arg)
{
char *end;
if (!arg)
return -EINVAL;
elfcorehdr_addr = memparse(arg, &end);
return end > arg ? 0 : -EINVAL;
}
early_param("elfcorehdr", setup_elfcorehdr);

8
mm/bootmem.c
View File

@ -34,14 +34,6 @@ unsigned long max_low_pfn;
unsigned long min_low_pfn;
unsigned long max_pfn;
#ifdef CONFIG_CRASH_DUMP
/*
* If we have booted due to a crash, max_pfn will be a very low value. We need
* to know the amount of memory that the previous kernel used.
*/
unsigned long saved_max_pfn;
#endif
bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);

8
mm/nobootmem.c
View File

@ -32,14 +32,6 @@ unsigned long max_low_pfn;
unsigned long min_low_pfn;
unsigned long max_pfn;
#ifdef CONFIG_CRASH_DUMP
/*
* If we have booted due to a crash, max_pfn will be a very low value. We need
* to know the amount of memory that the previous kernel used.
*/
unsigned long saved_max_pfn;
#endif
static void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
u64 goal, u64 limit)
{