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authorLinus Torvalds <torvalds@g5.osdl.org>2005-11-28 14:34:23 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-28 14:34:23 -0800
commit6aab341e0a28aff100a09831c5300a2994b8b986 (patch)
tree1af3908275aa5e1b16e80efee554a9a7504c56d4 /arch/powerpc/kernel/vdso.c
parent458af5439fe7ae7d95ca14106844e61f0795166c (diff)
downloadop-kernel-dev-6aab341e0a28aff100a09831c5300a2994b8b986.zip
op-kernel-dev-6aab341e0a28aff100a09831c5300a2994b8b986.tar.gz
mm: re-architect the VM_UNPAGED logic
This replaces the (in my opinion horrible) VM_UNMAPPED logic with very explicit support for a "remapped page range" aka VM_PFNMAP. It allows a VM area to contain an arbitrary range of page table entries that the VM never touches, and never considers to be normal pages. Any user of "remap_pfn_range()" automatically gets this new functionality, and doesn't even have to mark the pages reserved or indeed mark them any other way. It just works. As a side effect, doing mmap() on /dev/mem works for arbitrary ranges. Sparc update from David in the next commit. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/powerpc/kernel/vdso.c')
-rw-r--r--arch/powerpc/kernel/vdso.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index b44b36e..f0c47da 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -145,8 +145,7 @@ static void dump_vdso_pages(struct vm_area_struct * vma)
struct page *pg = virt_to_page(vdso32_kbase +
i*PAGE_SIZE);
struct page *upg = (vma && vma->vm_mm) ?
- follow_page(vma->vm_mm, vma->vm_start +
- i*PAGE_SIZE, 0)
+ follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
: NULL;
dump_one_vdso_page(pg, upg);
}
@@ -157,8 +156,7 @@ static void dump_vdso_pages(struct vm_area_struct * vma)
struct page *pg = virt_to_page(vdso64_kbase +
i*PAGE_SIZE);
struct page *upg = (vma && vma->vm_mm) ?
- follow_page(vma->vm_mm, vma->vm_start +
- i*PAGE_SIZE, 0)
+ follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
: NULL;
dump_one_vdso_page(pg, upg);
}
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