Commit 10054230 authored by Yinghai Lu's avatar Yinghai Lu Committed by H. Peter Anvin
Browse files

x86, 64bit: Don't set max_pfn_mapped wrong value early on native path 



We are not having max_pfn_mapped set correctly until init_memory_mapping.
So don't print its initial value for 64bit

Also need to use KERNEL_IMAGE_SIZE directly for highmap cleanup.

-v2: update comments about max_pfn_mapped according to Stefano Stabellini.

Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-14-git-send-email-yinghai@kernel.org


Acked-by: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 6b9c75ac

arch/x86/kernel/head64.c

+0 −3
Original line number Diff line number Diff line
@@ -148,9 +148,6 @@ void __init x86_64_start_kernel(char * real_mode_data) 
	/* clear bss before set_intr_gate with early_idt_handler */

	clear_bss();



	/* XXX - this is wrong... we need to build page tables from scratch */

	max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT;



	for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) {

#ifdef CONFIG_EARLY_PRINTK

		set_intr_gate(i, &early_idt_handlers[i]);

arch/x86/kernel/setup.c

+2 −0
Original line number Diff line number Diff line
@@ -996,8 +996,10 @@ void __init setup_arch(char **cmdline_p) 
	setup_bios_corruption_check();

#endif



#ifdef CONFIG_X86_32

	printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",

			(max_pfn_mapped<<PAGE_SHIFT) - 1);

#endif



	reserve_real_mode();

arch/x86/mm/init_64.c

+9 −1
Original line number Diff line number Diff line
@@ -378,10 +378,18 @@ void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) 
void __init cleanup_highmap(void)

{

	unsigned long vaddr = __START_KERNEL_map;

	unsigned long vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);

	unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE;

	unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;

	pmd_t *pmd = level2_kernel_pgt;



	/*

	 * Native path, max_pfn_mapped is not set yet.

	 * Xen has valid max_pfn_mapped set in

	 *	arch/x86/xen/mmu.c:xen_setup_kernel_pagetable().

	 */

	if (max_pfn_mapped)

		vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);



	for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) {

		if (pmd_none(*pmd))

			continue;

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