linux-kernel - Re: [PATCH] mm/memory.c: Convert to use vmf

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Date:   Thu, 5 Sep 2019 11:59:10 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     akpm@...ux-foundation.org, rcampbell@...dia.com,
        jglisse@...hat.com, mhocko@...e.com, aneesh.kumar@...ux.ibm.com,
        peterz@...radead.org, airlied@...hat.com, thellstrom@...are.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/memory.c: Convert to use vmf_error()

On Fri, Sep 06, 2019 at 12:13:00AM +0530, Souptick Joarder wrote:
> +++ b/mm/memory.c
> @@ -1750,13 +1750,10 @@ static vm_fault_t __vm_insert_mixed(struct vm_area_struct *vma,
>  	} else {
>  		return insert_pfn(vma, addr, pfn, pgprot, mkwrite);
>  	}
> -
> -	if (err == -ENOMEM)
> -		return VM_FAULT_OOM;
> -	if (err < 0 && err != -EBUSY)
> -		return VM_FAULT_SIGBUS;
> -
> -	return VM_FAULT_NOPAGE;
> +	if (!err || err == -EBUSY)
> +		return VM_FAULT_NOPAGE;
> +	else
> +		return vmf_error(err);
>  }

My plan is to convert insert_page() to return a VM_FAULT error code like
insert_pfn() does.  Need to finish off the vm_insert_page() conversions
first ;-)