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SubjectRe: [PATCH 3/3] vdso: preallocate new vmas
This seems somewhat insane:

int install_special_mapping(struct mm_struct *mm,
unsigned long addr, unsigned long len,
+ unsigned long vm_flags, struct page **pages,
+ struct vm_area_struct **vma_prealloc)
+ int ret = 0;
+ struct vm_area_struct *vma = *vma_prealloc;

(removed the "old" lines to make it more readable).

Why pass in "struct vm_area_struct **vma_prealloc" when you could just
pass in a plain and more readable "struct vm_area_struct *vma"?

My *guess* is that you originally cleared the vma_prealloc thing if
you used it, but in the patch you sent out you definitely don't (the
_only_ use of that "vma_prealloc" is the line that loads the content
into "vma", so this interface looks like it is some remnant of an
earlier and more complicated patch?


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