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Diffstat (limited to 'arch/x86/mm/init_64.c')
-rw-r--r--arch/x86/mm/init_64.c116
1 files changed, 49 insertions, 67 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 9a6674689a20..84346200e783 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -21,6 +21,7 @@
#include <linux/initrd.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
+#include <linux/memblock.h>
#include <linux/proc_fs.h>
#include <linux/pci.h>
#include <linux/pfn.h>
@@ -52,8 +53,6 @@
#include <asm/init.h>
#include <linux/bootmem.h>
-static unsigned long dma_reserve __initdata;
-
static int __init parse_direct_gbpages_off(char *arg)
{
direct_gbpages = 0;
@@ -98,6 +97,43 @@ static int __init nonx32_setup(char *str)
__setup("noexec32=", nonx32_setup);
/*
+ * When memory was added/removed make sure all the processes MM have
+ * suitable PGD entries in the local PGD level page.
+ */
+void sync_global_pgds(unsigned long start, unsigned long end)
+{
+ unsigned long address;
+
+ for (address = start; address <= end; address += PGDIR_SIZE) {
+ const pgd_t *pgd_ref = pgd_offset_k(address);
+ unsigned long flags;
+ struct page *page;
+
+ if (pgd_none(*pgd_ref))
+ continue;
+
+ spin_lock_irqsave(&pgd_lock, flags);
+ list_for_each_entry(page, &pgd_list, lru) {
+ pgd_t *pgd;
+ spinlock_t *pgt_lock;
+
+ pgd = (pgd_t *)page_address(page) + pgd_index(address);
+ pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
+ spin_lock(pgt_lock);
+
+ if (pgd_none(*pgd))
+ set_pgd(pgd, *pgd_ref);
+ else
+ BUG_ON(pgd_page_vaddr(*pgd)
+ != pgd_page_vaddr(*pgd_ref));
+
+ spin_unlock(pgt_lock);
+ }
+ spin_unlock_irqrestore(&pgd_lock, flags);
+ }
+}
+
+/*
* NOTE: This function is marked __ref because it calls __init function
* (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
*/
@@ -293,7 +329,7 @@ static __ref void *alloc_low_page(unsigned long *phys)
panic("alloc_low_page: ran out of memory");
adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE);
- memset(adr, 0, PAGE_SIZE);
+ clear_page(adr);
*phys = pfn * PAGE_SIZE;
return adr;
}
@@ -534,11 +570,13 @@ kernel_physical_mapping_init(unsigned long start,
unsigned long end,
unsigned long page_size_mask)
{
-
+ bool pgd_changed = false;
unsigned long next, last_map_addr = end;
+ unsigned long addr;
start = (unsigned long)__va(start);
end = (unsigned long)__va(end);
+ addr = start;
for (; start < end; start = next) {
pgd_t *pgd = pgd_offset_k(start);
@@ -563,7 +601,12 @@ kernel_physical_mapping_init(unsigned long start,
spin_lock(&init_mm.page_table_lock);
pgd_populate(&init_mm, pgd, __va(pud_phys));
spin_unlock(&init_mm.page_table_lock);
+ pgd_changed = true;
}
+
+ if (pgd_changed)
+ sync_global_pgds(addr, end);
+
__flush_tlb_all();
return last_map_addr;
@@ -573,23 +616,7 @@ kernel_physical_mapping_init(unsigned long start,
void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn,
int acpi, int k8)
{
-#ifndef CONFIG_NO_BOOTMEM
- unsigned long bootmap_size, bootmap;
-
- bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
- bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size,
- PAGE_SIZE);
- if (bootmap == -1L)
- panic("Cannot find bootmem map of size %ld\n", bootmap_size);
- reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP");
- /* 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);
-#else
- e820_register_active_regions(0, start_pfn, end_pfn);
-#endif
+ memblock_x86_register_active_regions(0, start_pfn, end_pfn);
}
#endif
@@ -799,52 +826,6 @@ void mark_rodata_ro(void)
#endif
-int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
- int flags)
-{
-#ifdef CONFIG_NUMA
- int nid, next_nid;
- int ret;
-#endif
- unsigned long pfn = phys >> PAGE_SHIFT;
-
- if (pfn >= max_pfn) {
- /*
- * This can happen with kdump kernels when accessing
- * firmware tables:
- */
- if (pfn < max_pfn_mapped)
- return -EFAULT;
-
- printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n",
- phys, len);
- return -EFAULT;
- }
-
- /* Should check here against the e820 map to avoid double free */
-#ifdef CONFIG_NUMA
- nid = phys_to_nid(phys);
- next_nid = phys_to_nid(phys + len - 1);
- if (nid == next_nid)
- ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags);
- else
- ret = reserve_bootmem(phys, len, flags);
-
- if (ret != 0)
- return ret;
-
-#else
- reserve_bootmem(phys, len, flags);
-#endif
-
- if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
- dma_reserve += len / PAGE_SIZE;
- set_dma_reserve(dma_reserve);
- }
-
- return 0;
-}
-
int kern_addr_valid(unsigned long addr)
{
unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
@@ -1003,6 +984,7 @@ vmemmap_populate(struct page *start_page, unsigned long size, int node)
}
}
+ sync_global_pgds((unsigned long)start_page, end);
return 0;
}