netdev - Re: [bisected] kernel panic 2.6.22 -> 2.6.26-rc9+

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 13 Jul 2008 14:55:25 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Krzysztof Halasa <khc@...waw.pl>
Cc:	<linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <rmk+lkml@....linux.org.uk>
Subject: Re: [bisected] kernel panic 2.6.22 -> 2.6.26-rc9+

On Sun, 13 Jul 2008 23:51:06 +0200 Krzysztof Halasa <khc@...waw.pl> wrote:

> Andrew Morton <akpm@...ux-foundation.org> writes:
> 
> > --- a/include/asm-arm/bitops.h~a
> > +++ a/include/asm-arm/bitops.h
> > @@ -277,9 +277,16 @@ static inline int constant_fls(int x)
> >   * the clz instruction for much better code efficiency.
> >   */
> >  
> > -#define fls(x) \
> > +#define __fls(x) \
> >  	( __builtin_constant_p(x) ? constant_fls(x) : \
> >  	  ({ int __r; asm("clz\t%0, %1" : "=r"(__r) : "r"(x) : "cc"); 32-__r; }) )
> > +
> > +/* Implement fls() in C so that 64-bit args are suitably truncated */
> > +static inline int fls(int x)
> > +{
> > +	return __fls(x);
> > +}
> > +
> 
> Well, I like it more as it fixes all possible places instead of only
> fls64().
> 
> But... can't we just move the #define body into the inline fls(x)?
> Will there be other users of __fls(x)? It seems the
> __builtin_constant_p(x) works for inline functions.

Could.  That was a minimal&safe thing.

> The above patch fixes the kernel panic, too.

OK, thanks.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html