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Date: Mon, 16 Jun 2008 16:11:08 -0700
From: Yinghai Lu <yhlu.kernel@...il.com>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: kill bad_ppro
so don't punish all other cpus without that problem when init highmem
Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
Index: linux-2.6/arch/x86/kernel/setup_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_32.c
+++ linux-2.6/arch/x86/kernel/setup_32.c
@@ -69,6 +69,7 @@
#include <asm/cacheflush.h>
#include <asm/processor.h>
#include <asm/efi.h>
+#include <asm/bugs.h>
/* This value is set up by the early boot code to point to the value
immediately after the boot time page tables. It contains a *physical*
@@ -776,6 +777,14 @@ void __init setup_arch(char **cmdline_p)
if (efi_enabled)
efi_init();
+ if (ppro_with_ram_bug()) {
+ e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
+ E820_RESERVED);
+ sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
+ printk(KERN_INFO "fixed physical RAM map:\n");
+ e820_print_map("bad_ppro");
+ }
+
e820_register_active_regions(0, 0, -1UL);
/*
* partially used pages are not usable - thus
Index: linux-2.6/arch/x86/mm/discontig_32.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/discontig_32.c
+++ linux-2.6/arch/x86/mm/discontig_32.c
@@ -405,7 +405,7 @@ void __init zone_sizes_init(void)
return;
}
-void __init set_highmem_pages_init(int bad_ppro)
+void __init set_highmem_pages_init(void)
{
#ifdef CONFIG_HIGHMEM
struct zone *zone;
@@ -425,7 +425,7 @@ void __init set_highmem_pages_init(int b
zone->name, nid, zone_start_pfn, zone_end_pfn);
add_highpages_with_active_regions(nid, zone_start_pfn,
- zone_end_pfn, bad_ppro);
+ zone_end_pfn);
}
totalram_pages += totalhigh_pages;
#endif
Index: linux-2.6/arch/x86/mm/init_32.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/init_32.c
+++ linux-2.6/arch/x86/mm/init_32.c
@@ -225,13 +225,6 @@ static void __init kernel_physical_mappi
update_page_count(PG_LEVEL_4K, pages_4k);
}
-static inline int page_kills_ppro(unsigned long pagenr)
-{
- if (pagenr >= 0x70000 && pagenr <= 0x7003F)
- return 1;
- return 0;
-}
-
/*
* devmem_is_allowed() checks to see if /dev/mem access to a certain address
* is valid. The argument is a physical page number.
@@ -292,22 +285,17 @@ static void __init permanent_kmaps_init(
pkmap_page_table = pte;
}
-static void __init
-add_one_highpage_init(struct page *page, int pfn, int bad_ppro)
+static void __init add_one_highpage_init(struct page *page, int pfn)
{
- if (!(bad_ppro && page_kills_ppro(pfn))) {
- ClearPageReserved(page);
- init_page_count(page);
- __free_page(page);
- totalhigh_pages++;
- } else
- SetPageReserved(page);
+ ClearPageReserved(page);
+ init_page_count(page);
+ __free_page(page);
+ totalhigh_pages++;
}
struct add_highpages_data {
unsigned long start_pfn;
unsigned long end_pfn;
- int bad_ppro;
};
static void __init add_highpages_work_fn(unsigned long start_pfn,
@@ -317,10 +305,8 @@ static void __init add_highpages_work_fn
struct page *page;
unsigned long final_start_pfn, final_end_pfn;
struct add_highpages_data *data;
- int bad_ppro;
data = (struct add_highpages_data *)datax;
- bad_ppro = data->bad_ppro;
final_start_pfn = max(start_pfn, data->start_pfn);
final_end_pfn = min(end_pfn, data->end_pfn);
@@ -332,29 +318,26 @@ static void __init add_highpages_work_fn
if (!pfn_valid(node_pfn))
continue;
page = pfn_to_page(node_pfn);
- add_one_highpage_init(page, node_pfn, bad_ppro);
+ add_one_highpage_init(page, node_pfn);
}
}
void __init add_highpages_with_active_regions(int nid, unsigned long start_pfn,
- unsigned long end_pfn,
- int bad_ppro)
+ unsigned long end_pfn)
{
struct add_highpages_data data;
data.start_pfn = start_pfn;
data.end_pfn = end_pfn;
- data.bad_ppro = bad_ppro;
work_with_active_regions(nid, add_highpages_work_fn, &data);
}
#ifndef CONFIG_NUMA
-static void __init set_highmem_pages_init(int bad_ppro)
+static void __init set_highmem_pages_init(void)
{
- add_highpages_with_active_regions(0, highstart_pfn, highend_pfn,
- bad_ppro);
+ add_highpages_with_active_regions(0, highstart_pfn, highend_pfn);
totalram_pages += totalhigh_pages;
}
@@ -363,7 +346,7 @@ static void __init set_highmem_pages_ini
#else
# define kmap_init() do { } while (0)
# define permanent_kmaps_init(pgd_base) do { } while (0)
-# define set_highmem_pages_init(bad_ppro) do { } while (0)
+# define set_highmem_pages_init() do { } while (0)
#endif /* CONFIG_HIGHMEM */
pteval_t __PAGE_KERNEL = _PAGE_KERNEL;
@@ -610,13 +593,11 @@ static struct kcore_list kcore_mem, kcor
void __init mem_init(void)
{
int codesize, reservedpages, datasize, initsize;
- int tmp, bad_ppro;
+ int tmp;
#ifdef CONFIG_FLATMEM
BUG_ON(!mem_map);
#endif
- bad_ppro = ppro_with_ram_bug();
-
/* this will put all low memory onto the freelists */
totalram_pages += free_all_bootmem();
@@ -628,7 +609,7 @@ void __init mem_init(void)
if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp)))
reservedpages++;
- set_highmem_pages_init(bad_ppro);
+ set_highmem_pages_init();
codesize = (unsigned long) &_etext - (unsigned long) &_text;
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
Index: linux-2.6/include/asm-x86/highmem.h
===================================================================
--- linux-2.6.orig/include/asm-x86/highmem.h
+++ linux-2.6/include/asm-x86/highmem.h
@@ -75,7 +75,7 @@ struct page *kmap_atomic_to_page(void *p
#define flush_cache_kmaps() do { } while (0)
extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn,
- unsigned long end_pfn, int bad_ppro);
+ unsigned long end_pfn);
#endif /* __KERNEL__ */
Index: linux-2.6/include/asm-x86/numa_32.h
===================================================================
--- linux-2.6.orig/include/asm-x86/numa_32.h
+++ linux-2.6/include/asm-x86/numa_32.h
@@ -6,7 +6,7 @@ extern void numa_remove_cpu(int cpu);
#ifdef CONFIG_NUMA
extern void __init remap_numa_kva(void);
-extern void set_highmem_pages_init(int);
+extern void set_highmem_pages_init(void);
#else
static inline void remap_numa_kva(void)
{
--
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