linux-kernel - Re: [PATCH] fix vmstat per cpu usage

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]

Message-ID: <17615.55638.314556.722153@cargo.ozlabs.ibm.com>
Date:	Wed, 2 Aug 2006 08:44:38 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Andrew Morton <akpm@...l.org>
Cc:	Jan Blunck <jblunck@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix vmstat per cpu usage

Andrew Morton writes:

> On Tue, 1 Aug 2006 19:36:21 +0200
> Jan Blunck <jblunck@...e.de> wrote:
> 
> > The per cpu variables are used incorrectly in vmstat.h.
[snip]
> > -	__get_cpu_var(vm_event_states.event[item])++;
> > +	__get_cpu_var(vm_event_states).event[item]++;
> >  }
> 
> How odd.  Are there any negative consequences to the existing code?

That sort of thing - i.e. using __get_cpu_var on something which isn't
just a simple variable name - works with the current per-cpu macro
definitions, because they are pretty simple, but one can imagine other
reasonable implementations of __get_cpu_var which need the argument to
be a simple variable name.  I struck this when I was experimenting
with using __thread variables for per-cpu data.

Paul.
-
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/