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Commit 0ebabb41 authored by Naoya Horiguchi's avatar Naoya Horiguchi Committed by Andi Kleen
Browse files

hugetlb: redefine hugepage copy functions 



This patch modifies hugepage copy functions to have only destination
and source hugepages as arguments for later use.
The old ones are renamed from copy_{gigantic,huge}_page() to
copy_user_{gigantic,huge}_page().
This naming convention is consistent with that between copy_highpage()
and copy_user_highpage().

ChangeLog since v4:
- add blank line between local declaration and code
- remove unnecessary might_sleep()

ChangeLog since v2:
- change copy_huge_page() from macro to inline dummy function
  to avoid compile warning when !CONFIG_HUGETLB_PAGE.

Signed-off-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: default avatarMel Gorman <mel@csn.ul.ie>
Reviewed-by: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
parent bf50bab2

include/linux/hugetlb.h

+4 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ int hugetlb_reserve_pages(struct inode *inode, long from, long to, 
						int acctflags);

void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);

void __isolate_hwpoisoned_huge_page(struct page *page);

void copy_huge_page(struct page *dst, struct page *src);



extern unsigned long hugepages_treat_as_movable;

extern const unsigned long hugetlb_zero, hugetlb_infinity;
@@ -102,6 +103,9 @@ static inline void hugetlb_report_meminfo(struct seq_file *m) 
#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })

#define huge_pte_offset(mm, address)	0

#define __isolate_hwpoisoned_huge_page(page)	0

static inline void copy_huge_page(struct page *dst, struct page *src)

{

}



#define hugetlb_change_protection(vma, address, end, newprot)

mm/hugetlb.c

+40 −5
Original line number Diff line number Diff line
@@ -423,14 +423,14 @@ static void clear_huge_page(struct page *page, 
	}

}



static void copy_gigantic_page(struct page *dst, struct page *src,

static void copy_user_gigantic_page(struct page *dst, struct page *src,

			   unsigned long addr, struct vm_area_struct *vma)

{

	int i;

	struct hstate *h = hstate_vma(vma);

	struct page *dst_base = dst;

	struct page *src_base = src;

	might_sleep();



	for (i = 0; i < pages_per_huge_page(h); ) {

		cond_resched();

		copy_user_highpage(dst, src, addr + i*PAGE_SIZE, vma);
@@ -440,14 +440,15 @@ static void copy_gigantic_page(struct page *dst, struct page *src, 
		src = mem_map_next(src, src_base, i);

	}

}

static void copy_huge_page(struct page *dst, struct page *src,



static void copy_user_huge_page(struct page *dst, struct page *src,

			   unsigned long addr, struct vm_area_struct *vma)

{

	int i;

	struct hstate *h = hstate_vma(vma);



	if (unlikely(pages_per_huge_page(h) > MAX_ORDER_NR_PAGES)) {

		copy_gigantic_page(dst, src, addr, vma);

		copy_user_gigantic_page(dst, src, addr, vma);

		return;

	}
@@ -458,6 +459,40 @@ static void copy_huge_page(struct page *dst, struct page *src, 
	}

}



static void copy_gigantic_page(struct page *dst, struct page *src)

{

	int i;

	struct hstate *h = page_hstate(src);

	struct page *dst_base = dst;

	struct page *src_base = src;



	for (i = 0; i < pages_per_huge_page(h); ) {

		cond_resched();

		copy_highpage(dst, src);



		i++;

		dst = mem_map_next(dst, dst_base, i);

		src = mem_map_next(src, src_base, i);

	}

}



void copy_huge_page(struct page *dst, struct page *src)

{

	int i;

	struct hstate *h = page_hstate(src);



	if (unlikely(pages_per_huge_page(h) > MAX_ORDER_NR_PAGES)) {

		copy_gigantic_page(dst, src);

		return;

	}



	might_sleep();

	for (i = 0; i < pages_per_huge_page(h); i++) {

		cond_resched();

		copy_highpage(dst + i, src + i);

	}

}



static void enqueue_huge_page(struct hstate *h, struct page *page)

{

	int nid = page_to_nid(page);
@@ -2412,7 +2447,7 @@ static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, 
	if (unlikely(anon_vma_prepare(vma)))

		return VM_FAULT_OOM;



	copy_huge_page(new_page, old_page, address, vma);

	copy_user_huge_page(new_page, old_page, address, vma);

	__SetPageUptodate(new_page);



	/*