Re: [patch/rfc 1/4] GPIO implementation framework

[David Brownell <david-b@pacbell.net>]

On Tuesday 13 November 2007, eric miao wrote:
> 
> Here comes a bunch of patches to illustrate my idea, some are not related to
> the point I mentioned, and they are not mature for now :-)
> 
> Subject: [PATCH 1/5] add gpio_is_onchip() for commonly used gpio range checking

I'll send substantive comments later, but meanwhile note
that the *CURRENT* version was posted last Friday:

  http://marc.info/?l=linux-kernel&m=119463810905330&w=2
  http://marc.info/?l=linux-kernel&m=119463811005344&w=2
  http://marc.info/?l=linux-kernel&m=119463811105352&w=2

Plus the appended tweak.  It's more useful to send patches
against current code, so applying them doesn't provide a
small avalanche of rejects.  :)


With respect to this patch adding gpio_is_onchip(), I
don't see a point.  The "gpio >= chip->base" check
is basically "are the data structures corrupted?" and
so it should only be done if "extra_checks" is defined.
(And IMO, not then ...)  And combining the other two tests
that way doesn't make anything more clear to me.  That's
somewhat of a style issue, I guess, unless you're like
me and don't much trust GCC to avoid extra instructions.

- Dave

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