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[PATCH] i386: initialize end-of-memory variables as early as possible

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Move initialization of all memory end variables to as early as
possible, so that dependent code doesn't need to check whether these
variables have already been set.

Change the range check in kunmap_atomic to actually make use of this
so that the no-mapping-estabished path (under CONFIG_DEBUG_HIGHMEM)
gets used only when the address is inside the lowmem area (and BUG()
otherwise).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Jan Beulich 2006-09-26 10:52:31 +02:00 committed by Andi Kleen
parent 3b94355c47
commit ba9c231f74
4 changed files with 14 additions and 21 deletions
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8
arch/i386/kernel/setup.c
View File

@ -1170,6 +1170,14 @@ static unsigned long __init setup_memory(void)
}
printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
pages_to_mb(highend_pfn - highstart_pfn));
num_physpages = highend_pfn;
high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
#else
num_physpages = max_low_pfn;
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
#endif
#ifdef CONFIG_FLATMEM
max_mapnr = num_physpages;
#endif
printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
pages_to_mb(max_low_pfn));

5
arch/i386/mm/discontig.c
View File

@ -313,6 +313,11 @@ unsigned long __init setup_memory(void)
highstart_pfn = system_max_low_pfn;
printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
pages_to_mb(highend_pfn - highstart_pfn));
num_physpages = highend_pfn;
high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
#else
num_physpages = system_max_low_pfn;
high_memory = (void *) __va(system_max_low_pfn * PAGE_SIZE - 1) + 1;
#endif
printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
pages_to_mb(system_max_low_pfn));

2
arch/i386/mm/highmem.c
View File

@ -54,7 +54,7 @@ void kunmap_atomic(void *kvaddr, enum km_type type)
unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id();
if (vaddr < FIXADDR_START) { // FIXME
if (vaddr >= PAGE_OFFSET && vaddr < (unsigned long)high_memory) {
dec_preempt_count();
preempt_check_resched();
return;

20
arch/i386/mm/init.c
View File

@ -552,18 +552,6 @@ static void __init test_wp_bit(void)
}
}
static void __init set_max_mapnr_init(void)
{
#ifdef CONFIG_HIGHMEM
num_physpages = highend_pfn;
#else
num_physpages = max_low_pfn;
#endif
#ifdef CONFIG_FLATMEM
max_mapnr = num_physpages;
#endif
}
static struct kcore_list kcore_mem, kcore_vmalloc;
void __init mem_init(void)
@ -590,14 +578,6 @@ void __init mem_init(void)
}
#endif
set_max_mapnr_init();
#ifdef CONFIG_HIGHMEM
high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
#else
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
#endif
/* this will put all low memory onto the freelists */
totalram_pages += free_all_bootmem();