netdev - Re: dst->obsolete has become pointless

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Date:	Wed, 09 Nov 2011 15:56:09 -0800
From:	Joe Perches <joe@...ches.com>
To:	David Miller <davem@...emloft.net>
Cc:	steffen.klassert@...unet.com, netdev@...r.kernel.org,
	timo.teras@....fi
Subject: Re: dst->obsolete has become pointless

On Wed, 2011-11-09 at 14:20 -0500, David Miller wrote:
> From: Joe Perches <joe@...ches.com>
> Date: Wed, 09 Nov 2011 04:49:08 -0800
> 
> > On Tue, 2011-11-08 at 13:59 -0500, David Miller wrote:
> >> net: Kill pointless and misleading checks on dst->obsolete.
> > []
> >> Therefore rename it to dst->freed, and make it take on only the values
> >> "0" and "1".
> >> diff --git a/include/net/dst.h b/include/net/dst.h
> > []
> >> @@ -55,7 +55,7 @@ struct dst_entry {
> >>  #define DST_NOCOUNT		0x0020
> >>  
> >>  	short			error;
> >> -	short			obsolete;
> >> +	unsigned short		freed;
> > 
> > perhaps
> > 	bool freed;
> > 	bool __pad3;
> > just to mark the available space a bit more obviously.
> 
> Hmmm, what is a bool's defined type anyways?  It is a char on every
> architecture and ABI?

As far as I know, other than being large enough to
store a 1 and 0, it's implementation defined.

Just like an unsigned short.

I _believe_ gcc uses unsigned char width for
_Bool in all normal cases though.


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