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From: Peter Zijlstra on 13 Apr 2010 06:00
On Mon, 2010-04-12 at 13:22 -0700, Linus Torvalds wrote:
> +static int anon_vma_compatible(struct vm_area_struct *a, struct vm_area_struct *b)
> +{
> + return a->vm_end == b->vm_start &&
> + mpol_equal(vma_policy(a), vma_policy(b)) &&
> + a->vm_file == b->vm_file &&
> + !((a->vm_flags ^ b->vm_flags) & ~(VM_READ|VM_WRITE|VM_EXEC)) &&
> + b->vm_pgoff == a->vm_pgoff + ((b->vm_start - a->vm_start) >> PAGE_SHIFT);
> +}

Maybe write that as:

static int anon_vma_compatible(struct vm_area_struct *a, struct vm_area_struct *b)
{
if (a->vm_end != b->vm_start)
return 0;

if (!mpol_equal(vma_policy(a), vma_policy(b))
return 0;

if (a->vm_file != b->vm_file)
return 0;

if ((a->vm_flags ^ b->vm_flags) & ~(VM_READ|VM_WRITE|VM_EXEC))
return 0;

if (a->vm_pgoff + ((b->vm_start - a->vm_start) >> PAGE_SHIFT) != b->vm_pgoff)
return 0;

return 1;
}


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Prev: Fix missing of last user while dumping slab corruption log
Next: [RESEND] io-controller: add per device weight rule support