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x86/boot/e820: Clean up the E820 table size define names

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We've got a number of defines related to the E820 table and its size:

	E820MAP
	E820NR
	E820_X_MAX
	E820MAX

The first two denote byte offsets into the zeropage (struct boot_params),
and can are not used in the kernel and can be removed.

The E820_*_MAX values have an inconsistent structure and it's unclear in any
case what they mean. 'X' presuably goes for extended - but it's not very
expressive altogether.

Change these over to:

	E820_MAX_ENTRIES_ZEROPAGE
	E820_MAX_ENTRIES

... which are self-explanatory names.

No change in functionality.

Cc: Alex Thorlton <athorlton@sgi.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Huang, Ying <ying.huang@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Jackson <pj@sgi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2017-01-28 17:29:08 +01:00
parent 09821ff1d5
commit 08b46d5dd8
10 changed files with 27 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
arch/x86/include/asm/e820/types.h
View File

@ -4,12 +4,12 @@
#include <uapi/asm/e820/types.h>
/*
* The legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the
* constrained space in the zeropage.
* The legacy E820 BIOS limits us to 128 (E820_MAX_ENTRIES_ZEROPAGE) nodes
* due to the constrained space in the zeropage.
*
* On large systems we can easily have thousands of nodes with RAM,
* which cannot be fit into so few entries - so we have a mechanism
* to extend the e820 table size at build-time, via the E820_X_MAX
* to extend the e820 table size at build-time, via the E820_MAX_ENTRIES
* define below.
*
* ( Those extra entries are enumerated via the EFI memory map, not
@ -17,7 +17,7 @@
*
* Size our internal memory map tables to have room for these additional
* entries, based on a heuristic calculation: up to three entries per
* NUMA node, plus E820MAX for some extra space.
* NUMA node, plus E820_MAX_ENTRIES_ZEROPAGE for some extra space.
*
* This allows for bootstrap/firmware quirks such as possible duplicate
* E820 entries that might need room in the same arrays, prior to the
@ -31,20 +31,14 @@
#include <linux/numa.h>
#define E820_X_MAX (E820MAX + 3*MAX_NUMNODES)
/* Our map: */
#define E820MAP 0x2d0
/* Number of entries in E820MAP: */
#define E820NR 0x1e8
#define E820_MAX_ENTRIES (E820_MAX_ENTRIES_ZEROPAGE + 3*MAX_NUMNODES)
/*
* The whole array of E820 entries:
*/
struct e820_table {
__u32 nr_entries;
struct e820_entry entries[E820_X_MAX];
struct e820_entry entries[E820_MAX_ENTRIES];
};
/*

2
arch/x86/include/uapi/asm/bootparam.h
View File

@ -152,7 +152,7 @@ struct boot_params {
struct setup_header hdr; /* setup header */ /* 0x1f1 */
__u8 _pad7[0x290-0x1f1-sizeof(struct setup_header)];
__u32 edd_mbr_sig_buffer[EDD_MBR_SIG_MAX]; /* 0x290 */
struct e820_entry e820_table[E820MAX]; /* 0x2d0 */
struct e820_entry e820_table[E820_MAX_ENTRIES_ZEROPAGE]; /* 0x2d0 */
__u8 _pad8[48]; /* 0xcd0 */
struct edd_info eddbuf[EDDMAXNR]; /* 0xd00 */
__u8 _pad9[276]; /* 0xeec */

7
arch/x86/include/uapi/asm/e820/types.h
View File

@ -1,8 +1,11 @@
#ifndef _UAPI_ASM_E820_TYPES_H
#define _UAPI_ASM_E820_TYPES_H
/* The maximum number of entries in E820MAP: */
#define E820MAX 128
/*
* This is the maximum number of entries in struct boot_params::e820_table (the zeropage),
* which is part of the x86 boot protocol ABI:
*/
#define E820_MAX_ENTRIES_ZEROPAGE 128
#ifndef __ASSEMBLY__

2
arch/x86/kernel/crash.c
View File

@ -509,7 +509,7 @@ static int add_e820_entry(struct boot_params *params, struct e820_entry *entry)
unsigned int nr_e820_entries;
nr_e820_entries = params->e820_entries;
if (nr_e820_entries >= E820MAX)
if (nr_e820_entries >= E820_MAX_ENTRIES_ZEROPAGE)
return 1;
memcpy(&params->e820_table[nr_e820_entries], entry,

8
arch/x86/kernel/e820.c
View File

@ -261,10 +261,10 @@ static int __init cpcompare(const void *a, const void *b)
int __init e820__update_table(struct e820_entry *biosmap, int max_nr_map, u32 *pnr_map)
{
static struct change_member change_point_list[2*E820_X_MAX] __initdata;
static struct change_member *change_point[2*E820_X_MAX] __initdata;
static struct e820_entry *overlap_list[E820_X_MAX] __initdata;
static struct e820_entry new_bios[E820_X_MAX] __initdata;
static struct change_member change_point_list[2*E820_MAX_ENTRIES] __initdata;
static struct change_member *change_point[2*E820_MAX_ENTRIES] __initdata;
static struct e820_entry *overlap_list[E820_MAX_ENTRIES] __initdata;
static struct e820_entry new_bios[E820_MAX_ENTRIES] __initdata;
enum e820_type current_type, last_type;
unsigned long long last_addr;
int chgidx;

6
arch/x86/kernel/kexec-bzimage64.c
View File

@ -102,9 +102,9 @@ static int setup_e820_entries(struct boot_params *params)
nr_e820_entries = e820_table_firmware->nr_entries;
/* TODO: Pass entries more than E820MAX in bootparams setup data */
if (nr_e820_entries > E820MAX)
nr_e820_entries = E820MAX;
/* TODO: Pass entries more than E820_MAX_ENTRIES_ZEROPAGE in bootparams setup data */
if (nr_e820_entries > E820_MAX_ENTRIES_ZEROPAGE)
nr_e820_entries = E820_MAX_ENTRIES_ZEROPAGE;
params->e820_entries = nr_e820_entries;
memcpy(&params->e820_table, &e820_table_firmware->entries, nr_e820_entries*sizeof(struct e820_entry));

6
arch/x86/mm/init.c
View File

@ -373,14 +373,14 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range,
return nr_range;
}
struct range pfn_mapped[E820_X_MAX];
struct range pfn_mapped[E820_MAX_ENTRIES];
int nr_pfn_mapped;
static void add_pfn_range_mapped(unsigned long start_pfn, unsigned long end_pfn)
{
nr_pfn_mapped = add_range_with_merge(pfn_mapped, E820_X_MAX,
nr_pfn_mapped = add_range_with_merge(pfn_mapped, E820_MAX_ENTRIES,
nr_pfn_mapped, start_pfn, end_pfn);
nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_X_MAX);
nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_MAX_ENTRIES);
max_pfn_mapped = max(max_pfn_mapped, end_pfn);

4
arch/x86/mm/kasan_init_64.c
View File

@ -11,7 +11,7 @@
#include <asm/sections.h>
extern pgd_t early_level4_pgt[PTRS_PER_PGD];
extern struct range pfn_mapped[E820_X_MAX];
extern struct range pfn_mapped[E820_MAX_ENTRIES];
static int __init map_range(struct range *range)
{
@ -103,7 +103,7 @@ void __init kasan_init(void)
kasan_populate_zero_shadow((void *)KASAN_SHADOW_START,
kasan_mem_to_shadow((void *)PAGE_OFFSET));
for (i = 0; i < E820_X_MAX; i++) {
for (i = 0; i < E820_MAX_ENTRIES; i++) {
if (pfn_mapped[i].end == 0)
break;

2
arch/x86/xen/setup.c
View File

@ -41,7 +41,7 @@ struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
unsigned long xen_released_pages;
/* E820 map used during setting up memory. */
static struct e820_entry xen_e820_table[E820_X_MAX] __initdata;
static struct e820_entry xen_e820_table[E820_MAX_ENTRIES] __initdata;
static u32 xen_e820_table_entries __initdata;
/*

2
include/xen/page.h
View File

@ -38,7 +38,7 @@ struct xen_memory_region {
unsigned long n_pfns;
};
#define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820MAX */
#define XEN_EXTRA_MEM_MAX_REGIONS 128 /* == E820_MAX_ENTRIES_ZEROPAGE */
extern __initdata
struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS];