x86: clean up min_low_pfn

for 32bit
we already had early_res support, so don't need to track min_low_pfn.
keep it to 0 always.

also use init_bootmem_node instead of init_bootmem, so don't touch
min_low_pfn.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 27b8293..9bb35cf 100644 (file)
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -565,11 +565,7 @@ void __init find_low_pfn_range(void)
 {
        /* it could update max_pfn */
 
-       /*
-        * partially used pages are not usable - thus
-        * we are rounding upwards:
-        */
-       min_low_pfn = PFN_UP(init_pg_tables_end);
+       /* max_low_pfn is 0, we already have early_res support */
 
        max_low_pfn = max_pfn;
        if (max_low_pfn > MAXMEM_PFN) {
@@ -694,7 +690,9 @@ void __init setup_bootmem_allocator(void)
                panic("Cannot find bootmem map of size %ld\n", bootmap_size);
        reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP");
 
-       bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, max_low_pfn);
+       /* don't touch min_low_pfn */
+       bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT,
+                                        min_low_pfn, max_low_pfn);
        printk(KERN_INFO "  mapped low ram: 0 - %08lx\n",
                 max_pfn_mapped<<PAGE_SHIFT);
        printk(KERN_INFO "  low ram: %08lx - %08lx\n",

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 99a091e..955dbc8 100644 (file)
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -620,7 +620,9 @@ void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn)
                                 PAGE_SIZE);
        if (bootmap == -1L)
                panic("Cannot find bootmem map of size %ld\n", bootmap_size);
-       bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
+       /* don't touch min_low_pfn */
+       bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT,
+                                        0, end_pfn);
        e820_register_active_regions(0, start_pfn, end_pfn);
        free_bootmem_with_active_regions(0, end_pfn);
        early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT);