Commit 60e64d46 authored by Vivek Goyal's avatar Vivek Goyal Committed by Linus Torvalds
Browse files

[PATCH] kdump: Routines for copying dump pages 



This patch provides the interfaces necessary to read the dump contents,
treating it as a high memory device.

Signed off by Hariprasad Nellitheertha <hari@in.ibm.com>
Signed-off-by: default avatarEric Biederman <ebiederm@xmission.com>
Signed-off-by: default avatarVivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 5f016456

arch/i386/mm/highmem.c

+18 −0
Original line number Diff line number Diff line
@@ -75,6 +75,24 @@ void kunmap_atomic(void *kvaddr, enum km_type type) 
	preempt_check_resched();

}



/* This is the same as kmap_atomic() but can map memory that doesn't

 * have a struct page associated with it.

 */

void *kmap_atomic_pfn(unsigned long pfn, enum km_type type)

{

	enum fixed_addresses idx;

	unsigned long vaddr;



	inc_preempt_count();



	idx = type + KM_TYPE_NR*smp_processor_id();

	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);

	set_pte(kmap_pte-idx, pfn_pte(pfn, kmap_prot));

	__flush_tlb_one(vaddr);



	return (void*) vaddr;

}



struct page *kmap_atomic_to_page(void *ptr)

{

	unsigned long idx, vaddr = (unsigned long)ptr;

include/asm-i386/highmem.h

+1 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ void *kmap(struct page *page); 
void kunmap(struct page *page);

void *kmap_atomic(struct page *page, enum km_type type);

void kunmap_atomic(void *kvaddr, enum km_type type);

void *kmap_atomic_pfn(unsigned long pfn, enum km_type type);

struct page *kmap_atomic_to_page(void *ptr);



#define flush_cache_kmaps()	do { } while (0)

include/linux/crash_dump.h

0 → 100644
+13 −0
Original line number Diff line number Diff line 
#ifndef LINUX_CRASH_DUMP_H

#define LINUX_CRASH_DUMP_H



#ifdef CONFIG_CRASH_DUMP

#include <linux/kexec.h>

#include <linux/smp_lock.h>

#include <linux/device.h>

#include <linux/proc_fs.h>



extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,

						unsigned long, int);

#endif /* CONFIG_CRASH_DUMP */

#endif /* LINUX_CRASHDUMP_H */

include/linux/highmem.h

+1 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ static inline void *kmap(struct page *page) 


#define kmap_atomic(page, idx)		page_address(page)

#define kunmap_atomic(addr, idx)	do { } while (0)

#define kmap_atomic_pfn(pfn, idx)	page_address(pfn_to_page(pfn))

#define kmap_atomic_to_page(ptr)	virt_to_page(ptr)



#endif /* CONFIG_HIGHMEM */

kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ obj-$(CONFIG_AUDITSYSCALL) += auditsc.o 
obj-$(CONFIG_KPROBES) += kprobes.o

obj-$(CONFIG_SYSFS) += ksysfs.o

obj-$(CONFIG_GENERIC_HARDIRQS) += irq/

obj-$(CONFIG_CRASH_DUMP) += crash_dump.o

obj-$(CONFIG_SECCOMP) += seccomp.o



ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y)