From: Hugh Dickins <hugh@veritas.com>
Date: Mon, 29 Jan 2007 21:24:08 +0000 (+0000)
Subject: [PATCH] mm: mremap correct rmap accounting
X-Git-Tag: MMI-PSA29.97-13-9~45393
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=701dfbc1cbdd42b814dd76a885c4b73f97011d08;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

[PATCH] mm: mremap correct rmap accounting

Nick Piggin points out that page accounting on MIPS multiple ZERO_PAGEs
is not maintained by its move_pte, and could lead to freeing a ZERO_PAGE.

Instead of complicating that move_pte, just forget the minor optimization
when mremapping, and change the one thing which needed it for correctness
- filemap_xip use ZERO_PAGE(0) throughout instead of according to address.

[ "There is no block device driver one could use for XIP on mips
   platforms" - Carsten Otte ]

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andrew Morton <akpm@osdl.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/asm-mips/pgtable.h b/include/asm-mips/pgtable.h
index f2e1325fec6c..3fcfd7979de5 100644
--- a/include/asm-mips/pgtable.h
+++ b/include/asm-mips/pgtable.h
@@ -69,16 +69,6 @@ extern unsigned long zero_page_mask;
 #define ZERO_PAGE(vaddr) \
 	(virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
 
-#define __HAVE_ARCH_MOVE_PTE
-#define move_pte(pte, prot, old_addr, new_addr)				\
-({									\
- 	pte_t newpte = (pte);						\
-	if (pte_present(pte) && pfn_valid(pte_pfn(pte)) &&		\
-			pte_page(pte) == ZERO_PAGE(old_addr))		\
-		newpte = mk_pte(ZERO_PAGE(new_addr), (prot));		\
-	newpte;								\
-})
-
 extern void paging_init(void);
 
 /*
diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
index 45b3553865cf..9dd9fbb75139 100644
--- a/mm/filemap_xip.c
+++ b/mm/filemap_xip.c
@@ -183,7 +183,7 @@ __xip_unmap (struct address_space * mapping,
 		address = vma->vm_start +
 			((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
 		BUG_ON(address < vma->vm_start || address >= vma->vm_end);
-		page = ZERO_PAGE(address);
+		page = ZERO_PAGE(0);
 		pte = page_check_address(page, mm, address, &ptl);
 		if (pte) {
 			/* Nuke the page table entry. */
@@ -246,7 +246,7 @@ xip_file_nopage(struct vm_area_struct * area,
 		__xip_unmap(mapping, pgoff);
 	} else {
 		/* not shared and writable, use ZERO_PAGE() */
-		page = ZERO_PAGE(address);
+		page = ZERO_PAGE(0);
 	}
 
 out:
diff --git a/mm/mremap.c b/mm/mremap.c
index 9c769fa29f32..5d4bd4f95b8e 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -105,7 +105,6 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
 		if (pte_none(*old_pte))
 			continue;
 		pte = ptep_clear_flush(vma, old_addr, old_pte);
-		/* ZERO_PAGE can be dependant on virtual addr */
 		pte = move_pte(pte, new_vma->vm_page_prot, old_addr, new_addr);
 		set_pte_at(mm, new_addr, new_pte, pte);
 	}