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x86: Change crash kernel to reserve via reserve_early() 

use find_e820_area()/reserve_early() instead.

-v2: address Eric's request, to restore original semantics.
     will fail, if the provided address can not be used.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
LKML-Reference: <4B09E2F9.7040403@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2009-11-22 17:18:49 -08:00 committed by Ingo Molnar
parent 350f8f5631
commit 44280733e7
1 changed files with 15 additions and 42 deletions
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57
arch/x86/kernel/setup.c
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@ -487,42 +487,11 @@ static void __init reserve_early_setup_data(void)
#ifdef CONFIG_KEXEC
/**
* Reserve @size bytes of crashkernel memory at any suitable offset.
*
* @size: Size of the crashkernel memory to reserve.
* Returns the base address on success, and -1ULL on failure.
*/
static
unsigned long long __init find_and_reserve_crashkernel(unsigned long long size)
{
const unsigned long long alignment = 16<<20; /* 16M */
unsigned long long start = 0LL;
while (1) {
int ret;
start = find_e820_area(start, ULONG_MAX, size, alignment);
if (start == -1ULL)
return start;
/* try to reserve it */
ret = reserve_bootmem_generic(start, size, BOOTMEM_EXCLUSIVE);
if (ret >= 0)
return start;
start += alignment;
}
}
static inline unsigned long long get_total_mem(void)
{
unsigned long long total;
total = max_low_pfn - min_low_pfn;
#ifdef CONFIG_HIGHMEM
total += highend_pfn - highstart_pfn;
#endif
total = max_pfn - min_low_pfn;
return total << PAGE_SHIFT;
}
@ -542,21 +511,25 @@ static void __init reserve_crashkernel(void)
/* 0 means: find the address automatically */
if (crash_base <= 0) {
crash_base = find_and_reserve_crashkernel(crash_size);
const unsigned long long alignment = 16<<20; /* 16M */
crash_base = find_e820_area(alignment, ULONG_MAX, crash_size,
alignment);
if (crash_base == -1ULL) {
pr_info("crashkernel reservation failed. "
"No suitable area found.\n");
pr_info("crashkernel reservation failed - No suitable area found.\n");
return;
}
} else {
ret = reserve_bootmem_generic(crash_base, crash_size,
BOOTMEM_EXCLUSIVE);
if (ret < 0) {
pr_info("crashkernel reservation failed - "
"memory is in use\n");
unsigned long long start;
start = find_e820_area(crash_base, ULONG_MAX, crash_size,
1<<20);
if (start != crash_base) {
pr_info("crashkernel reservation failed - memory is in use.\n");
return;
}
}
reserve_early(crash_base, crash_base + crash_size, "CRASH KERNEL");
printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
"for crashkernel (System RAM: %ldMB)\n",
@ -927,6 +900,8 @@ void __init setup_arch(char **cmdline_p)
reserve_initrd();
reserve_crashkernel();
vsmp_init();
io_delay_init();
@ -957,8 +932,6 @@ void __init setup_arch(char **cmdline_p)
*/
find_smp_config();
reserve_crashkernel();
#ifdef CONFIG_X86_64
/*
* dma32_reserve_bootmem() allocates bootmem which may conflict