linux-kernel - Re: >Re: [RFC] should VM_BUG_ON(cond) really evaluate cond

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Message-ID: <1319996494.13597.69.camel@edumazet-laptop>
Date:	Sun, 30 Oct 2011 18:41:34 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Ben Hutchings <bhutchings@...arflare.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: >Re: [RFC] should VM_BUG_ON(cond) really evaluate cond

Le dimanche 30 octobre 2011 à 10:07 -0700, Linus Torvalds a écrit :
> On Sun, Oct 30, 2011 at 8:16 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >
> > Because it doesnt work if x is const.
> 
> Just remove the const. Problem solved.
> 
> Both cases of 'const' are totally arbitrary and useless. The
> test_bit() one is literally a cast to const (admittedly also *from*
> const, but nobody cares), and the atomic_read() one is just because it
> uses a silly inline function where a macro would be simpler.
> 

Oh well, I am lost. I always considered inline functione better because
of prototype checks.


Changing atomic_read(const atomic_t *v) prototype to
atomic_read(atomic_t *v) is not an option.


To save your time and my time, please select your favorite between :

1) The patch I did

2) 
 static inline int atomic_read(const atomic_t *v)
 {
	return ACCESS_AT_MOST_ONCE(((atomic_t *)v)->counter);
 }

3) 
 static inline int atomic_read(const atomic_t *v)
 {
	return ACCESS_AT_MOST_ONCE(*(int *)&(v)->counter);
 }

4) macro (I personnaly dont like it)
#define atomic_read(v) ACCESS_AT_MOST_ONCE(*(int *)&(v)->counter)

Thanks


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