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[PATCH] mm: remove VM_LOCKED before remap_pfn_range and drop VM_SHM 

Remove VM_LOCKED before remap_pfn range from device drivers and get rid of
VM_SHM.

remap_pfn_range() already sets VM_IO.  There is no need to set VM_SHM since
it does nothing.  VM_LOCKED is of no use since the remap_pfn_range does not
place pages on the LRU.  The pages are therefore never subject to swap
anyways.  Remove all the vm_flags settings before calling remap_pfn_range.

After removing all the vm_flag settings no use of VM_SHM is left.  Drop it.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-06-25 05:46:47 -07:00 committed by Linus Torvalds
parent 9f1a3cfcff
commit 68402ddc67
14 changed files with 1 additions and 32 deletions
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1
arch/arm/kernel/bios32.c
View File

@ -702,7 +702,6 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
/*
* Mark this as IO
*/
vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
if (remap_pfn_range(vma, vma->vm_start, phys,

2
arch/cris/arch-v32/drivers/pci/bios.c
View File

@ -27,8 +27,6 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
/* Leave vm_pgoff as-is, the PCI space address is the physical
* address on this platform.
*/
vma->vm_flags |= (VM_SHM | VM_LOCKED | VM_IO);
prot = pgprot_val(vma->vm_page_prot);
vma->vm_page_prot = __pgprot(prot);

2
arch/i386/pci/i386.c
View File

@ -285,8 +285,6 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
/* Leave vm_pgoff as-is, the PCI space address is the physical
* address on this platform.
*/
vma->vm_flags |= (VM_SHM | VM_LOCKED | VM_IO);
prot = pgprot_val(vma->vm_page_prot);
if (boot_cpu_data.x86 > 3)
prot |= _PAGE_PCD | _PAGE_PWT;

3
arch/ia64/pci/pci.c
View File

@ -602,8 +602,6 @@ pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
* Leave vm_pgoff as-is, the PCI space address is the physical
* address on this platform.
*/
vma->vm_flags |= (VM_SHM | VM_RESERVED | VM_IO);
if (write_combine && efi_range_is_wc(vma->vm_start,
vma->vm_end - vma->vm_start))
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
@ -666,7 +664,6 @@ pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma)
vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT;
vma->vm_page_prot = prot;
vma->vm_flags |= (VM_SHM | VM_RESERVED | VM_IO);
if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
size, vma->vm_page_prot))

1
arch/powerpc/kernel/pci_32.c
View File

@ -1654,7 +1654,6 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
return -EINVAL;
vma->vm_pgoff = offset >> PAGE_SHIFT;
vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp,
vma->vm_page_prot,
mmap_state, write_combine);

1
arch/powerpc/kernel/pci_64.c
View File

@ -877,7 +877,6 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
return -EINVAL;
vma->vm_pgoff = offset >> PAGE_SHIFT;
vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp,
vma->vm_page_prot,
mmap_state, write_combine);

2
arch/powerpc/kernel/proc_ppc64.c
View File

@ -115,8 +115,6 @@ static int page_map_mmap( struct file *file, struct vm_area_struct *vma )
{
struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode);
vma->vm_flags |= VM_SHM | VM_LOCKED;
if ((vma->vm_end - vma->vm_start) > dp->size)
return -EINVAL;

1
arch/ppc/kernel/pci.c
View File

@ -1032,7 +1032,6 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
return -EINVAL;
vma->vm_pgoff = offset >> PAGE_SHIFT;
vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
vma->vm_page_prot = __pci_mmap_set_pgprot(dev, rp,
vma->vm_page_prot,
mmap_state, write_combine);

12
arch/xtensa/kernel/pci.c
View File

@ -349,17 +349,6 @@ __pci_mmap_make_offset(struct pci_dev *dev, struct vm_area_struct *vma,
return -EINVAL;
}
/*
* Set vm_flags of VMA, as appropriate for this architecture, for a pci device
* mapping.
*/
static __inline__ void
__pci_mmap_set_flags(struct pci_dev *dev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state)
{
vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
}
/*
* Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
* device mapping.
@ -399,7 +388,6 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
if (ret < 0)
return ret;
__pci_mmap_set_flags(dev, vma, mmap_state);
__pci_mmap_set_pgprot(dev, vma, mmap_state, write_combine);
ret = io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,

1
drivers/char/mmtimer.c
View File

@ -329,7 +329,6 @@ static int mmtimer_mmap(struct file *file, struct vm_area_struct *vma)
if (PAGE_SIZE > (1 << 16))
return -ENOSYS;
vma->vm_flags |= (VM_IO | VM_SHM | VM_LOCKED );
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
mmtimer_addr = __pa(RTC_COUNTER_ADDR);

1
drivers/sbus/char/flash.c
View File

@ -71,7 +71,6 @@ flash_mmap(struct file *file, struct vm_area_struct *vma)
if (vma->vm_end - (vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT)) > size)
size = vma->vm_end - (vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT));
vma->vm_flags |= (VM_SHM | VM_LOCKED);
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
if (io_remap_pfn_range(vma, vma->vm_start, addr, size, vma->vm_page_prot))

2
drivers/sbus/char/vfc_dev.c
View File

@ -623,7 +623,7 @@ static int vfc_mmap(struct file *file, struct vm_area_struct *vma)
map_size = sizeof(struct vfc_regs);
vma->vm_flags |=
(VM_SHM | VM_LOCKED | VM_IO | VM_MAYREAD | VM_MAYWRITE | VM_MAYSHARE);
(VM_MAYREAD | VM_MAYWRITE | VM_MAYSHARE);
map_offset = (unsigned int) (long)dev->phys_regs;
ret = io_remap_pfn_range(vma, vma->vm_start,
MK_IOSPACE_PFN(dev->which_io,

3
drivers/video/igafb.c
View File

@ -232,9 +232,6 @@ static int igafb_mmap(struct fb_info *info,
size = vma->vm_end - vma->vm_start;
/* To stop the swapper from even considering these pages. */
vma->vm_flags |= (VM_SHM | VM_LOCKED);
/* Each page, see which map applies */
for (page = 0; page < size; ) {
map_size = 0;

1
include/linux/mm.h
View File

@ -145,7 +145,6 @@ extern unsigned int kobjsize(const void *objp);
#define VM_GROWSDOWN 0x00000100 /* general info on the segment */
#define VM_GROWSUP 0x00000200
#define VM_SHM 0x00000000 /* Means nothing: delete it later */
#define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */
#define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */