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Re: [PATCH 2/2] drivers/dax: Changing RC value

From Andrew Morton <akpm@linux-foundation.org>
Newsgroups linux.kernel
Subject Re: [PATCH 2/2] drivers/dax: Changing RC value
Date 2017-04-11 23:00 +0200
Message-ID <tvb3k-3yo-19@gated-at.bofh.it> (permalink)
References <tuWxj-2Jg-3@gated-at.bofh.it> <tuWxk-2Jg-27@gated-at.bofh.it>
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On Tue, 11 Apr 2017 10:56:45 +0530 Pushkar Jambhlekar <pushkar.iit@gmail.com> wrote:

> Changing rc value from VM_FAULT_FALLBACK to VM_FAULT_SIGBUS for an unknown / unsupported fault size.
> 
> ...
>
> --- a/drivers/dax/dax.c
> +++ b/drivers/dax/dax.c
> @@ -590,7 +590,7 @@ static int dax_dev_huge_fault(struct vm_fault *vmf,
>  		rc = __dax_dev_pud_fault(dax_dev, vmf);
>  		break;
>  	default:
> -		rc =  VM_FAULT_FALLBACK;
> +		rc = VM_FAULT_SIGBUS;
>  	}
>  	rcu_read_unlock();

The change seems to make sense but more info would be helpful.  What
is wrong with the current code?  ie, what goes wrong if we return
VM_FAULT_FALLBACK here?

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Thread

[PATCH 1/2] drivers/dax: Avoiding potential deadlock Pushkar Jambhlekar <pushkar.iit@gmail.com> - 2017-04-11 07:30 +0200
  [PATCH 2/2] drivers/dax: Changing RC value Pushkar Jambhlekar <pushkar.iit@gmail.com> - 2017-04-11 07:30 +0200
    Re: [PATCH 2/2] drivers/dax: Changing RC value Andrew Morton <akpm@linux-foundation.org> - 2017-04-11 23:00 +0200
      Re: [PATCH 2/2] drivers/dax: Changing RC value Dan Williams <dan.j.williams@intel.com> - 2017-04-12 18:30 +0200
  Re: [PATCH 1/2] drivers/dax: Avoiding potential deadlock Dan Williams <dan.j.williams@intel.com> - 2017-04-11 18:20 +0200
    Re: [PATCH 1/2] drivers/dax: Avoiding potential deadlock Pushkar Jambhlekar <pushkar.iit@gmail.com> - 2017-04-12 06:20 +0200

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