linux-kernel - [PATCH] setup vma->vm_page_prot by vm_get_page

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Date:	Wed, 17 Oct 2007 12:22:40 +0800
From:	Coly Li <coyli@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
CC:	Hugh Dickins <hugh@...itas.com>, "Luck, Tony" <tony.luck@...el.com>
Subject: [PATCH] setup vma->vm_page_prot by vm_get_page_prot()

This patch uses vm_get_page_prot() to setup vma->vm_page_prot.
use-vm_read-write-exec-to-set-vm_page_prot.patch just only replaces "& 0x7" with "&
(VM_READ|VM_WRITE|VM_EXEC)". This is a non-unified method, because there is a vm_get_page_prot() in
mm/mmap.c and exported to kerenl.
Though inside vm_get_page_prot() the protection flags is AND with
(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED), it does not hurt correct code.

This patch can replace use-vm_read-write-exec-to-set-vm_page_prot.patch.

Signed-off-by: Coly Li <coyli@...e.de>
Cc: Hugh Dickins <hugh@...itas.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 arch/ia64/mm/init.c |    2 +-
 fs/exec.c           |    2 +-
 mm/mmap.c           |   11 ++++-------
 mm/mprotect.c       |    6 ++----
 4 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index c14abef..4065280 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -130,8 +130,8 @@ ia64_init_addr_space (void)
 		vma->vm_mm = current->mm;
 		vma->vm_start = current->thread.rbs_bot & PAGE_MASK;
 		vma->vm_end = vma->vm_start + PAGE_SIZE;
-		vma->vm_page_prot = protection_map[VM_DATA_DEFAULT_FLAGS & 0x7];
 		vma->vm_flags = VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT;
+		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 		down_write(&current->mm->mmap_sem);
 		if (insert_vm_struct(current->mm, vma)) {
 			up_write(&current->mm->mmap_sem);
diff --git a/fs/exec.c b/fs/exec.c
index 073b0b8..2794fee 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -260,7 +260,7 @@ static int __bprm_mm_init(struct linux_binprm *bprm)
 	vma->vm_start = vma->vm_end - PAGE_SIZE;

 	vma->vm_flags = VM_STACK_FLAGS;
-	vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
+	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 	err = insert_vm_struct(mm, vma);
 	if (err) {
 		up_write(&mm->mmap_sem);
diff --git a/mm/mmap.c b/mm/mmap.c
index 0d40e66..57f5628 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1049,8 +1049,7 @@ int vma_wants_writenotify(struct vm_area_struct *vma)

 	/* The open routine did something to the protections already? */
 	if (pgprot_val(vma->vm_page_prot) !=
-	    pgprot_val(protection_map[vm_flags &
-		    (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]))
+	    pgprot_val(vm_get_page_prot(vm_flags)))
 		return 0;

 	/* Specialty mapping? */
@@ -1131,8 +1130,7 @@ munmap_back:
 	vma->vm_start = addr;
 	vma->vm_end = addr + len;
 	vma->vm_flags = vm_flags;
-	vma->vm_page_prot = protection_map[vm_flags &
-				(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)];
+	vma->vm_page_prot = vm_get_page_prot(vm_flags);
 	vma->vm_pgoff = pgoff;

 	if (file) {
@@ -2003,8 +2001,7 @@ unsigned long do_brk(unsigned long addr, unsigned long len)
 	vma->vm_end = addr + len;
 	vma->vm_pgoff = pgoff;
 	vma->vm_flags = flags;
-	vma->vm_page_prot = protection_map[flags &
-				(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)];
+	vma->vm_page_prot = vm_get_page_prot(flags);
 	vma_link(mm, vma, prev, rb_link, rb_parent);
 out:
 	mm->total_vm += len >> PAGE_SHIFT;
@@ -2210,7 +2207,7 @@ int install_special_mapping(struct mm_struct *mm,
 	vma->vm_end = addr + len;

 	vma->vm_flags = vm_flags | mm->def_flags;
-	vma->vm_page_prot = protection_map[vma->vm_flags & 7];
+	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);

 	vma->vm_ops = &special_mapping_vmops;
 	vma->vm_private_data = pages;
diff --git a/mm/mprotect.c b/mm/mprotect.c
index e8346c3..d21c358 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -193,11 +193,9 @@ success:
 	 * held in write mode.
 	 */
 	vma->vm_flags = newflags;
-	vma->vm_page_prot = protection_map[newflags &
-		(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)];
+	vma->vm_page_prot = vm_get_page_prot(newflags);
 	if (vma_wants_writenotify(vma)) {
-		vma->vm_page_prot = protection_map[newflags &
-			(VM_READ|VM_WRITE|VM_EXEC)];
+		vma->vm_page_prot = vm_get_page_prot(newflags);
 		dirty_accountable = 1;
 	}




-- 
Coly Li
SuSE PRC Labs
-
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