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Commit a04ad82d authored by Yinghai Lu's avatar Yinghai Lu Committed by Ingo Molnar
Browse files

x86: fix init_memory_mapping over boundary, v4 



use PMD_SHIFT to calculate boundary also adjust size for pre-allocated
table size

Signed-off-by: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent b4df32f4

arch/x86/mm/init_32.c

+67 −22
Original line number Diff line number Diff line
@@ -184,8 +184,9 @@ static inline int is_kernel_text(unsigned long addr) 
 * PAGE_OFFSET:

 */

static void __init kernel_physical_mapping_init(pgd_t *pgd_base,

						unsigned long start,

						unsigned long end)

						unsigned long start_pfn,

						unsigned long end_pfn,

						int use_pse)

{

	int pgd_idx, pmd_idx, pte_ofs;

	unsigned long pfn;
@@ -193,33 +194,33 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base, 
	pmd_t *pmd;

	pte_t *pte;

	unsigned pages_2m = 0, pages_4k = 0;

	unsigned limit_pfn = end >> PAGE_SHIFT;



	pgd_idx = pgd_index(start + PAGE_OFFSET);

	pgd = pgd_base + pgd_idx;

	pfn = start >> PAGE_SHIFT;

	if (!cpu_has_pse)

		use_pse = 0;



	pfn = start_pfn;

	pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);

	pgd = pgd_base + pgd_idx;

	for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) {

		pmd = one_md_table_init(pgd);

		if (pfn >= limit_pfn)

			continue;



		for (pmd_idx = 0;

		     pmd_idx < PTRS_PER_PMD && pfn < limit_pfn;

		if (pfn >= end_pfn)

			continue;

#ifdef CONFIG_X86_PAE

		pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);

		pmd += pmd_idx;

#else

		pmd_idx = 0;

#endif

		for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn;

		     pmd++, pmd_idx++) {

			unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET;



			/*

			 * Map with big pages if possible, otherwise

			 * create normal page tables:

			 *

			 * Don't use a large page for the first 2/4MB of memory

			 * because there are often fixed size MTRRs in there

			 * and overlapping MTRRs into large pages can cause

			 * slowdowns.

			 */

			if (cpu_has_pse && !(pgd_idx == 0 && pmd_idx == 0) &&

				(pfn + PTRS_PER_PTE) <= limit_pfn) {

			if (use_pse) {

				unsigned int addr2;

				pgprot_t prot = PAGE_KERNEL_LARGE;
@@ -238,8 +239,9 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base, 
			}

			pte = one_page_table_init(pmd);



			for (pte_ofs = 0;

			     pte_ofs < PTRS_PER_PTE && pfn < limit_pfn;

			pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET);

			pte += pte_ofs;

			for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn;

			     pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) {

				pgprot_t prot = PAGE_KERNEL;
@@ -738,14 +740,18 @@ static void __init find_early_table_space(unsigned long end) 


	if (cpu_has_pse) {

		unsigned long extra;

		extra = end - ((end>>21) << 21);

		extra += (2UL<<20);



		extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT);

		extra += PMD_SIZE;

		ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;

	} else

		ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;



	tables += PAGE_ALIGN(ptes * sizeof(pte_t));



	/* for fixmap */

	tables += PAGE_SIZE * 2;



	/*

	 * RED-PEN putting page tables only on node 0 could

	 * cause a hotspot and fill up ZONE_DMA. The page tables
@@ -770,6 +776,8 @@ unsigned long __init_refok init_memory_mapping(unsigned long start, 
						unsigned long end)

{

	pgd_t *pgd_base = swapper_pg_dir;

	unsigned long start_pfn, end_pfn;

	unsigned long big_page_start;



	/*

	 * Find space for the kernel direct mapping tables.
@@ -794,7 +802,44 @@ unsigned long __init_refok init_memory_mapping(unsigned long start, 
		__PAGE_KERNEL_EXEC |= _PAGE_GLOBAL;

	}



	kernel_physical_mapping_init(pgd_base, start, end);

	/*

	 * Don't use a large page for the first 2/4MB of memory

	 * because there are often fixed size MTRRs in there

	 * and overlapping MTRRs into large pages can cause

	 * slowdowns.

	 */

	big_page_start = PMD_SIZE;



	if (start < big_page_start) {

		start_pfn = start >> PAGE_SHIFT;

		end_pfn = min(big_page_start>>PAGE_SHIFT, end>>PAGE_SHIFT);

	} else {

		/* head is not big page alignment ? */

		start_pfn = start >> PAGE_SHIFT;

		end_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)

				 << (PMD_SHIFT - PAGE_SHIFT);

	}

	if (start_pfn < end_pfn)

		kernel_physical_mapping_init(pgd_base, start_pfn, end_pfn, 0);



	/* big page range */

	start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT)

			 << (PMD_SHIFT - PAGE_SHIFT);

	if (start_pfn < (big_page_start >> PAGE_SHIFT))

		start_pfn =  big_page_start >> PAGE_SHIFT;

	end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT);

	if (start_pfn < end_pfn)

		kernel_physical_mapping_init(pgd_base, start_pfn, end_pfn,

						cpu_has_pse);



	/* tail is not big page alignment ? */

	start_pfn = end_pfn;

	if (start_pfn > (big_page_start>>PAGE_SHIFT)) {

		end_pfn = end >> PAGE_SHIFT;

		if (start_pfn < end_pfn)

			kernel_physical_mapping_init(pgd_base, start_pfn,

							 end_pfn, 0);

	}



	early_ioremap_page_table_range_init(pgd_base);