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x86: Move find_smp_config() earlier and avoid bootmem usage

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Move the find_smp_config() call to before bootmem is initialized.
Use reserve_early() instead of reserve_bootmem() in it.

This simplifies the code, we only need to call find_smp_config()
once and can remove the now unneeded reserve parameter from
x86_init_mpparse::find_smp_config.

We thus also reduce x86's dependency on bootmem allocations.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <4B0BB9F2.70907@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu
2009-11-24 02:48:18 -08:00
committed by Ingo Molnar
parent eb41c8be89
commit b24c2a925a
7 changed files with 22 additions and 64 deletions
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44
arch/x86/kernel/mpparse.c
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@@ -667,36 +667,18 @@ void __init default_get_smp_config(unsigned int early)
*/
}
static void __init smp_reserve_bootmem(struct mpf_intel *mpf)
static void __init smp_reserve_memory(struct mpf_intel *mpf)
{
unsigned long size = get_mpc_size(mpf->physptr);
#ifdef CONFIG_X86_32
/*
* We cannot access to MPC table to compute table size yet,
* as only few megabytes from the bottom is mapped now.
* PC-9800's MPC table places on the very last of physical
* memory; so that simply reserving PAGE_SIZE from mpf->physptr
* yields BUG() in reserve_bootmem.
* also need to make sure physptr is below than max_low_pfn
* we don't need reserve the area above max_low_pfn
*/
unsigned long end = max_low_pfn * PAGE_SIZE;
if (mpf->physptr < end) {
if (mpf->physptr + size > end)
size = end - mpf->physptr;
reserve_bootmem_generic(mpf->physptr, size, BOOTMEM_DEFAULT);
}
#else
reserve_bootmem_generic(mpf->physptr, size, BOOTMEM_DEFAULT);
#endif
reserve_early(mpf->physptr, mpf->physptr+size, "MP-table mpc");
}
static int __init smp_scan_config(unsigned long base, unsigned long length,
unsigned reserve)
static int __init smp_scan_config(unsigned long base, unsigned long length)
{
unsigned int *bp = phys_to_virt(base);
struct mpf_intel *mpf;
unsigned long mem;
apic_printk(APIC_VERBOSE, "Scan SMP from %p for %ld bytes.\n",
bp, length);
@@ -717,12 +699,10 @@ static int __init smp_scan_config(unsigned long base, unsigned long length,
printk(KERN_INFO "found SMP MP-table at [%p] %llx\n",
mpf, (u64)virt_to_phys(mpf));
if (!reserve)
return 1;
reserve_bootmem_generic(virt_to_phys(mpf), sizeof(*mpf),
BOOTMEM_DEFAULT);
mem = virt_to_phys(mpf);
reserve_early(mem, mem + sizeof(*mpf), "MP-table mpf");
if (mpf->physptr)
smp_reserve_bootmem(mpf);
smp_reserve_memory(mpf);
return 1;
}
@@ -732,7 +712,7 @@ static int __init smp_scan_config(unsigned long base, unsigned long length,
return 0;
}
void __init default_find_smp_config(unsigned int reserve)
void __init default_find_smp_config(void)
{
unsigned int address;
@@ -744,9 +724,9 @@ void __init default_find_smp_config(unsigned int reserve)
* 2) Scan the top 1K of base RAM
* 3) Scan the 64K of bios
*/
if (smp_scan_config(0x0, 0x400, reserve) ||
smp_scan_config(639 * 0x400, 0x400, reserve) ||
smp_scan_config(0xF0000, 0x10000, reserve))
if (smp_scan_config(0x0, 0x400) ||
smp_scan_config(639 * 0x400, 0x400) ||
smp_scan_config(0xF0000, 0x10000))
return;
/*
* If it is an SMP machine we should know now, unless the
@@ -767,7 +747,7 @@ void __init default_find_smp_config(unsigned int reserve)
address = get_bios_ebda();
if (address)
smp_scan_config(address, 0x400, reserve);
smp_scan_config(address, 0x400);
}
#ifdef CONFIG_X86_IO_APIC