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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2015-02-10 14:09:49 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-10 14:30:30 -0800
commit8a5f14a23177061ec11daeaa3d09d0765d785c47 (patch)
tree5199ffd75455cc98b652767813d07e64e6895c4e /mm/madvise.c
parentc8d78c1823f46519473949d33f0d1d33fe21ea16 (diff)
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mm: drop support of non-linear mapping from unmap/zap codepath
We have remap_file_pages(2) emulation in -mm tree for few release cycles and we plan to have it mainline in v3.20. This patchset removes rest of VM_NONLINEAR infrastructure. Patches 1-8 take care about generic code. They are pretty straight-forward and can be applied without other of patches. Rest patches removes pte_file()-related stuff from architecture-specific code. It usually frees up one bit in non-present pte. I've tried to reuse that bit for swap offset, where I was able to figure out how to do that. For obvious reason I cannot test all that arch-specific code and would like to see acks from maintainers. In total, remap_file_pages(2) required about 1.4K lines of not-so-trivial kernel code. That's too much for functionality nobody uses. Tested-by: Felipe Balbi <balbi@ti.com> This patch (of 38): We don't create non-linear mappings anymore. Let's drop code which handles them on unmap/zap. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/madvise.c')
-rw-r--r--mm/madvise.c9
1 files changed, 1 insertions, 8 deletions
diff --git a/mm/madvise.c b/mm/madvise.c
index a271adc93289..917754d26c17 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -278,14 +278,7 @@ static long madvise_dontneed(struct vm_area_struct *vma,
if (vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP))
return -EINVAL;
- if (unlikely(vma->vm_flags & VM_NONLINEAR)) {
- struct zap_details details = {
- .nonlinear_vma = vma,
- .last_index = ULONG_MAX,
- };
- zap_page_range(vma, start, end - start, &details);
- } else
- zap_page_range(vma, start, end - start, NULL);
+ zap_page_range(vma, start, end - start, NULL);
return 0;
}