linux-kernel - Re: [PATCH 07/25] x86, pkeys: new page fault error code bit: PF

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Date:	Thu, 1 Oct 2015 13:54:05 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dave Hansen <dave@...1.net>
cc:	borntraeger@...ibm.com, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	dave.hansen@...ux.intel.com
Subject: Re: [PATCH 07/25] x86, pkeys: new page fault error code bit: PF_PK

On Mon, 28 Sep 2015, Dave Hansen wrote:
>  
>  /*
> @@ -916,7 +918,10 @@ static int spurious_fault_check(unsigned
>  
>  	if ((error_code & PF_INSTR) && !pte_exec(*pte))
>  		return 0;
> -
> +	/*
> +	 * Note: We do not do lazy flushing on protection key
> +	 * changes, so no spurious fault will ever set PF_PK.
> +	 */

It might be a bit more clear to have:

   	/* Comment .... */
  	if ((error_code & PF_PK))
  		return 1;

  	return 1;

That way the comment is associated to obviously redundant code, but
it's easier to read, especially if we add some new PF_ thingy after
that.

Other than that:

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>


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