linux-kernel - Re: early exception error

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Date:	Mon, 5 Jan 2009 18:30:25 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Robert Hancock <hancockr@...w.ca>,
	linux-kernel@...r.kernel.org, david@...g.hm,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: early exception error

[Jiri Slaby - Mon, Jan 05, 2009 at 04:14:12PM +0100]
| On 01/05/2009 04:01 PM, Cyrill Gorcunov wrote:
| > [Jiri Slaby - Mon, Jan 05, 2009 at 03:51:26PM +0100]
| > | On 01/05/2009 02:08 PM, Andi Kleen wrote:
| > | > +#define EARLY_BUG_ON(x) do { if (unlikely(!(x))) EARLY_BUG(); } while (0)
| > | 
| > | I think unintentionally inverted logic.
| > 
| > just second ! is missed :)
| 
| None is needed, two '!' are added in the macro itself while it passes the
| parameter to the builtin.

ah, yep :)

| 
| > | 
| > | > +#define EARLY_BUG_ON(x) do {} while(0)
| > | 
| > | Shouldn't be x referenced here?
| > |
| > 
| > but for what?
| 
| I know, core devs are sane, but e.g. for reasons such as
| 
| {'a' is used here already}
| EARLY_BUG_ON(!(a = readl(...)))
| {use 'a' again}
| 
| to stay on the safe side.
| 

I wouldn't populate this style Jiri. It become more complicated
as it should to be, agreed?

		- Cyrill -
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