linux-kernel - Re: [PATCH 01/45] kstrtox: converting strings to integers done (hopefully) right

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Message-Id: <201012071004.58311.arnd@arndb.de>
Date:	Tue, 7 Dec 2010 10:04:58 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Jesper Juhl <jj@...osbits.net>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/45] kstrtox: converting strings to integers done (hopefully) right

On Monday 06 December 2010 16:16:36 Alexey Dobriyan wrote:
> > <snip>
> >> +/* Internal, do not use. */
> >> +int _kstrtol(const char *s, unsigned int base, long *res)
> >> +{
> >> +     long long tmp;
> >> +     int rv;
> >> +
> >> +     rv = kstrtoll(s, base, &tmp);
> >> +     if (rv < 0)
> >> +             return rv;
> >> +     if (tmp != (long long)(long)tmp)
> >> +             return -EINVAL;
> >> +     *res = tmp;
> >> +     return 0;
> >> +}
> >> +EXPORT_SYMBOL(_kstrtol);
> >
> > Ok, probably I'm just being dense, but the "_" prefix tells me I probably
> > shouldn't use this function. The comment clearly tells me I shouldn't use
> > this function.
> > So, why is this exported? And if it is not/should not be exported, then
> > why is it not static?
> > (goes for other functions in this patch as well).
> 
> It is used by kstrtol() if "long" and "long long" aren't the same type.
> I can't ifdef it because gcc doesn't allow "#if sizeof(long long) == ".
> "Do not use" hints "use kstrtol()".

Can't you use #ifdef CONFIG_64BIT to see if long is 64 bit wide?

	Arnd
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