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crash_dump: Remove no longer used saved_max_pfn

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saved_max_pfn was originally introduced in commit

  92aa63a5a1 ("[PATCH] kdump: Retrieve saved max pfn")

It used to make sure that the user does not try to read the physical memory
beyond saved_max_pfn. But since commit

  921d58c0e6 ("vmcore: remove saved_max_pfn check")

it's no longer used for the check. This variable doesn't have any users
anymore so just remove it.

 [ bp: Drop the Calgary IOMMU reference from the commit message. ]

Signed-off-by: Kairui Song <kasong@redhat.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Link: https://lkml.kernel.org/r/20200330181544.1595733-1-kasong@redhat.com
This commit is contained in:
Kairui Song 2020-03-31 02:15:44 +08:00 committed by Borislav Petkov
parent 2fa9a3cf30
commit 4c5b566c21
3 changed files with 0 additions and 16 deletions
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8
arch/x86/kernel/e820.c
View File

@ -910,14 +910,6 @@ static int __init parse_memmap_one(char *p)
return -EINVAL; return -EINVAL;
if (!strncmp(p, "exactmap", 8)) { if (!strncmp(p, "exactmap", 8)) {
#ifdef CONFIG_CRASH_DUMP
/*
* If we are doing a crash dump, we still need to know
* the real memory size before the original memory map is
* reset.
*/
saved_max_pfn = e820__end_of_ram_pfn();
#endif
e820_table->nr_entries = 0; e820_table->nr_entries = 0;
userdef = 1; userdef = 1;
return 0; return 0;

2
include/linux/crash_dump.h
View File

@ -97,8 +97,6 @@ extern void unregister_oldmem_pfn_is_ram(void);
static inline bool is_kdump_kernel(void) { return 0; } static inline bool is_kdump_kernel(void) { return 0; }
#endif /* CONFIG_CRASH_DUMP */ #endif /* CONFIG_CRASH_DUMP */
extern unsigned long saved_max_pfn;
/* Device Dump information to be filled by drivers */ /* Device Dump information to be filled by drivers */
struct vmcoredd_data { struct vmcoredd_data {
char dump_name[VMCOREDD_MAX_NAME_BYTES]; /* Unique name of the dump */ char dump_name[VMCOREDD_MAX_NAME_BYTES]; /* Unique name of the dump */

6
kernel/crash_dump.c
View File

@ -5,12 +5,6 @@
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/export.h> #include <linux/export.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 * stores the physical address of elf header of crash image
* *