diff options
| -rw-r--r-- | arch/x86_64/kernel/e820.c | 82 |
1 files changed, 48 insertions, 34 deletions
diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c index 13c6c37610e..2570643ba1c 100644 --- a/arch/x86_64/kernel/e820.c +++ b/arch/x86_64/kernel/e820.c @@ -289,47 +289,61 @@ void __init e820_mark_nosave_regions(void) } } -/* Walk the e820 map and register active regions within a node */ -void __init -e820_register_active_regions(int nid, unsigned long start_pfn, - unsigned long end_pfn) +/* + * Finds an active region in the address range from start_pfn to end_pfn and + * returns its range in ei_startpfn and ei_endpfn for the e820 entry. + */ +static int __init e820_find_active_region(const struct e820entry *ei, + unsigned long start_pfn, + unsigned long end_pfn, + unsigned long *ei_startpfn, + unsigned long *ei_endpfn) { - int i; - unsigned long ei_startpfn, ei_endpfn; - for (i = 0; i < e820.nr_map; i++) { - struct e820entry *ei = &e820.map[i]; - ei_startpfn = round_up(ei->addr, PAGE_SIZE) >> PAGE_SHIFT; - ei_endpfn = round_down(ei->addr + ei->size, PAGE_SIZE) - >> PAGE_SHIFT; + *ei_startpfn = round_up(ei->addr, PAGE_SIZE) >> PAGE_SHIFT; + *ei_endpfn = round_down(ei->addr + ei->size, PAGE_SIZE) >> PAGE_SHIFT; - /* Skip map entries smaller than a page */ - if (ei_startpfn >= ei_endpfn) - continue; + /* Skip map entries smaller than a page */ + if (*ei_startpfn >= *ei_endpfn) + return 0; - /* Check if end_pfn_map should be updated */ - if (ei->type != E820_RAM && ei_endpfn > end_pfn_map) - end_pfn_map = ei_endpfn; + /* Check if end_pfn_map should be updated */ + if (ei->type != E820_RAM && *ei_endpfn > end_pfn_map) + end_pfn_map = *ei_endpfn; - /* Skip if map is outside the node */ - if (ei->type != E820_RAM || - ei_endpfn <= start_pfn || - ei_startpfn >= end_pfn) - continue; + /* Skip if map is outside the node */ + if (ei->type != E820_RAM || *ei_endpfn <= start_pfn || + *ei_startpfn >= end_pfn) + return 0; - /* Check for overlaps */ - if (ei_startpfn < start_pfn) - ei_startpfn = start_pfn; - if (ei_endpfn > end_pfn) - ei_endpfn = end_pfn; + /* Check for overlaps */ + if (*ei_startpfn < start_pfn) + *ei_startpfn = start_pfn; + if (*ei_endpfn > end_pfn) + *ei_endpfn = end_pfn; - /* Obey end_user_pfn to save on memmap */ - if (ei_startpfn >= end_user_pfn) - continue; - if (ei_endpfn > end_user_pfn) - ei_endpfn = end_user_pfn; + /* Obey end_user_pfn to save on memmap */ + if (*ei_startpfn >= end_user_pfn) + return 0; + if (*ei_endpfn > end_user_pfn) + *ei_endpfn = end_user_pfn; - add_active_range(nid, ei_startpfn, ei_endpfn); - } + return 1; +} + +/* Walk the e820 map and register active regions within a node */ +void __init +e820_register_active_regions(int nid, unsigned long start_pfn, + unsigned long end_pfn) +{ + unsigned long ei_startpfn; + unsigned long ei_endpfn; + int i; + + for (i = 0; i < e820.nr_map; i++) + if (e820_find_active_region(&e820.map[i], + start_pfn, end_pfn, + &ei_startpfn, &ei_endpfn)) + add_active_range(nid, ei_startpfn, ei_endpfn); } /* |