linux-kernel - Re: [PATCH v9 2/5] x86/cpuid: Add generic table for cpuid dependencies

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 for Android: free password hash cracker in your pocket

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

Date:   Fri, 13 Oct 2017 10:46:05 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Jonathan McDowell <noodles@...th.li>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v9 2/5] x86/cpuid: Add generic table for cpuid
 dependencies

> So instead of adding helpers the 1<< ops can be written out explicitly - they are 
> easy to read after all. Can also be:
> 
> 	var &= ~BIT(bit);
> 	var |= BIT(bit);

It's some more complicated because "var" are arrays.
Opencoding is fairly ugly.

I changed the main bitmap to use DECLARE_BITMAP now, which
avoids most of the casts. For accessing c->x86_capability and
cpu_caps_cleared it uses helpers now that do implicit casting.

-Andi