netdev - Re: [RFC PATCH] tg3: Convert chip type macros to inline functions

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Date:	Wed, 06 Feb 2013 17:05:38 -0800
From:	Joe Perches <joe@...ches.com>
To:	Michael Chan <mchan@...adcom.com>
Cc:	netdev <netdev@...r.kernel.org>, Hauke Mehrtens <hauke@...ke-m.de>,
	mcarlson@...adcom.com, nsujir@...adcom.com
Subject: Re: [RFC PATCH] tg3: Convert chip type macros to inline functions

On Wed, 2013-02-06 at 16:41 -0800, Michael Chan wrote:
> On Wed, 2013-02-06 at 15:44 -0800, Joe Perches wrote:
> > There are several macros that are used for
> > chip identification.
> > 
> > Perhaps it'd be better to use static inlines
> > instead of these macros as the code becomes a
> > bit more readable with less uppercase use.
[]
> > #define GET_ASIC_REV(CHIP_REV_ID)       ((CHIP_REV_ID) >> 12)
> > 
> > becomes:
> > 
> > static inline u32 tg3_asic_rev(const struct tg3 *tp)
> > {
> >         return tp->pci_chip_rev_id >> 12;
> > }

[]

> I think these don't have to be inline.  there is only one call in the
> fast path that I can see (tg3_start_xmit), and we can easily change that
> to test for a flag instead.  I wonder if that will make it smaller.

Nope.

Even if you make it static in tg3.c,
gcc inlines it anyway.



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