linux-kernel - Re: [PATCH] mtrr use type bool

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]

Message-ID: <20071031162016.GD27646@csclub.uwaterloo.ca>
Date:	Wed, 31 Oct 2007 12:20:16 -0400
From:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
To:	Richard Knutsson <ricknu-0@...dent.ltu.se>
Cc:	Paul Jimenez <pj@...ce.org>, rgooch@...f.csiro.au,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtrr use type bool

On Wed, Oct 31, 2007 at 04:27:31PM +0100, Richard Knutsson wrote:
> Paul Jimenez wrote:
....
> >-			usage_table[i] = usage_table[replace] + !!increment;
> >+			usage_table[i] = usage_table[replace] + increment;
> >  
> This seems a bit strange, using a boolean as an integer (yes I know, it 
> works but semantically...). What about:
> 
> +			usage_table[i] = usage_table[replace];
> +			usage_table[i] += increment ? 1 : 0;

What is wrong with:
usage_table[i] = usage_table[replace];
if (increment)
	usage_table[i]++;

I hate code with the '?' operator in general.  It's a conditional either
way, and at least this way you wouldn't even have to do a store in one
of the two cases 9although if the compiler can't figure out that is the
case already, then it really sucks).

Pauls code at least didn't involve a conditional at all, but on the
other hand is less clear to read.

--
Len Sorensen
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/