On 05/11/2013 06:23 PM, Kirill A. Shutemov wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
>
> do_huge_pmd_anonymous_page() has copy-pasted piece of handle_mm_fault()
> to handle fallback path.
>
> Let's consolidate code back by introducing VM_FAULT_FALLBACK return
> code.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> ---
> include/linux/huge_mm.h | 3 ---
> include/linux/mm.h | 3 ++-
> mm/huge_memory.c | 31 +++++--------------------------
> mm/memory.c | 9 ++++++---
> 4 files changed, 13 insertions(+), 33 deletions
Wow, nice diffstat!
This and the previous patch can go in the cleanups pile, no?
> @@ -3788,9 +3788,12 @@ retry:
> if (!pmd)
> return VM_FAULT_OOM;
> if (pmd_none(*pmd) && transparent_hugepage_enabled(vma)) {
> + int ret = 0;
> if (!vma->vm_ops)
> - return do_huge_pmd_anonymous_page(mm, vma, address,
> - pmd, flags);
> + ret = do_huge_pmd_anonymous_page(mm, vma, address,
> + pmd, flags);
> + if ((ret & VM_FAULT_FALLBACK) == 0)
> + return ret;
This could use a small comment about where the code flow is going, when
and why. FWIW, I vastly prefer the '!' form in these:
if (!(ret & VM_FAULT_FALLBACK))
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