mm: kill vma flag VM_RESERVED and mm->reserved_vm counter

A long time ago, in v2.4, VM_RESERVED kept swapout process off VMA,
currently it lost original meaning but still has some effects:

 | effect                 | alternative flags
-+------------------------+---------------------------------------------
1| account as reserved_vm | VM_IO
2| skip in core dump      | VM_IO, VM_DONTDUMP
3| do not merge or expand | VM_IO, VM_DONTEXPAND, VM_HUGETLB, VM_PFNMAP
4| do not mlock           | VM_IO, VM_DONTEXPAND, VM_HUGETLB, VM_PFNMAP

This patch removes reserved_vm counter from mm_struct.  Seems like nobody
cares about it, it does not exported into userspace directly, it only
reduces total_vm showed in proc.

Thus VM_RESERVED can be replaced with VM_IO or pair VM_DONTEXPAND | VM_DONTDUMP.

remap_pfn_range() and io_remap_pfn_range() set VM_IO|VM_DONTEXPAND|VM_DONTDUMP.
remap_vmalloc_range() set VM_DONTEXPAND | VM_DONTDUMP.

[akpm@linux-foundation.org: drivers/vfio/pci/vfio_pci.c fixup]
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Carsten Otte <cotte@de.ibm.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Eric Paris <eparis@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Kentaro Takeda <takedakn@nttdata.co.jp>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Venkatesh Pallipadi <venki@google.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

6 files changed, 8 insertions, 15 deletions

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 92177d5aedee..24efae464e2c 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -706,7 +706,7 @@ int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
                 goto out_unlock;
         }
 
-        vma->vm_flags |= VM_RESERVED | VM_IO | VM_PFNMAP | VM_DONTEXPAND;
+        vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
         vma->vm_ops = obj->dev->driver->gem_vm_ops;
         vma->vm_private_data = map->handle;
         vma->vm_page_prot =  pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
index 23a824e6a22a..db7bd292410b 100644
--- a/drivers/gpu/drm/drm_vm.c
+++ b/drivers/gpu/drm/drm_vm.c
@@ -514,8 +514,7 @@ static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
 
         vma->vm_ops = &drm_vm_dma_ops;
 
-        vma->vm_flags |= VM_RESERVED;   /* Don't swap */
-        vma->vm_flags |= VM_DONTEXPAND;
+        vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 
         drm_vm_open_locked(dev, vma);
         return 0;
@@ -643,21 +642,16 @@ int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
         case _DRM_SHM:
                 vma->vm_ops = &drm_vm_shm_ops;
                 vma->vm_private_data = (void *)map;
-                /* Don't let this area swap.  Change when
-                   DRM_KERNEL advisory is supported. */
-                vma->vm_flags |= VM_RESERVED;
                 break;
         case _DRM_SCATTER_GATHER:
                 vma->vm_ops = &drm_vm_sg_ops;
                 vma->vm_private_data = (void *)map;
-                vma->vm_flags |= VM_RESERVED;
                 vma->vm_page_prot = drm_dma_prot(map->type, vma);
                 break;
         default:
                 return -EINVAL; /* This should never happen. */
         }
-        vma->vm_flags |= VM_RESERVED;   /* Don't swap */
-        vma->vm_flags |= VM_DONTEXPAND;
+        vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 
         drm_vm_open_locked(dev, vma);
         return 0;
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index fcdbe46914f7..d2545560664f 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -500,7 +500,7 @@ static int exynos_drm_gem_mmap_buffer(struct file *filp,
 
         DRM_DEBUG_KMS("%s\n", __FILE__);
 
-        vma->vm_flags |= (VM_IO | VM_RESERVED);
+        vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
 
         update_vm_cache_attr(exynos_gem_obj, vma);
 
diff --git a/drivers/gpu/drm/gma500/framebuffer.c b/drivers/gpu/drm/gma500/framebuffer.c
index 884ba73ac6ce..afded54dbb10 100644
--- a/drivers/gpu/drm/gma500/framebuffer.c
+++ b/drivers/gpu/drm/gma500/framebuffer.c
@@ -178,8 +178,7 @@ static int psbfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
          */
         vma->vm_ops = &psbfb_vm_ops;
         vma->vm_private_data = (void *)psbfb;
-        vma->vm_flags |= VM_RESERVED | VM_IO |
-                                        VM_MIXEDMAP | VM_DONTEXPAND;
+        vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP;
         return 0;
 }
 
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index a877813571a4..3ba72dbdc4bd 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -285,7 +285,7 @@ int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
          */
 
         vma->vm_private_data = bo;
-        vma->vm_flags |= VM_RESERVED | VM_IO | VM_MIXEDMAP | VM_DONTEXPAND;
+        vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP;
         return 0;
 out_unref:
         ttm_bo_unref(&bo);
@@ -300,7 +300,7 @@ int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
 
         vma->vm_ops = &ttm_bo_vm_ops;
         vma->vm_private_data = ttm_bo_reference(bo);
-        vma->vm_flags |= VM_RESERVED | VM_IO | VM_MIXEDMAP | VM_DONTEXPAND;
+        vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND;
         return 0;
 }
 EXPORT_SYMBOL(ttm_fbdev_mmap);
diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index 67df842fbb33..69a2b16f42a6 100644
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -243,7 +243,7 @@ static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
                         size = 0;
         }
 
-        vma->vm_flags |= VM_RESERVED;   /* avoid to swap out this VMA */
+        /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
         return 0;
 }