On Wed, Jan 03, 2018 at 03:04:19PM -0600, Pete Zaitcev wrote:
> @@ -1231,12 +1233,15 @@ static int mon_bin_vma_fault(struct vm_fault *vmf)
>       unsigned long offset, chunk_idx;
>       struct page *pageptr;
>  
> +     mutex_lock(&rp->fetch_lock);
>       offset = vmf->pgoff << PAGE_SHIFT;
>       if (offset >= rp->b_size)
> +             mutex_unlock(&rp->fetch_lock);
>               return VM_FAULT_SIGBUS;
>       chunk_idx = offset / CHUNK_SIZE;

missing braces ... maybe you'd rather a 'goto sigbus' approach?

>       pageptr = rp->b_vec[chunk_idx].pg;
>       get_page(pageptr);
> +     mutex_unlock(&rp->fetch_lock);
>       vmf->page = pageptr;
>       return 0;
>  }
> 
> -- Pete
> 
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