linux-kernel - Re: [PATCH 1/8] cgroups: Add res_counter_write

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: <20110809173117.GB31645@somewhere.redhat.com>
Date:	Tue, 9 Aug 2011 19:31:23 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Aditya Kali <adityakali@...gle.com>
Subject: Re: [PATCH 1/8] cgroups: Add res_counter_write_u64() API

On Tue, Aug 09, 2011 at 05:17:39PM +0200, Oleg Nesterov wrote:
> On 07/29, Frederic Weisbecker wrote:
> >
> > +void res_counter_write_u64(struct res_counter *counter, int member, u64 val)
> > +{
> > +	unsigned long long *target;
> > +	unsigned long flags;
> > +
> > +	spin_lock_irqsave(&counter->lock, flags);
> > +	target = res_counter_member(counter, member);
> > +	*target = val;
> > +	spin_unlock_irqrestore(&counter->lock, flags);
> > +}
> 
> Hmm. Why do we need counter->lock?
> 
> OK, probably it is for BITS_PER_LONG < 64. May be it makes sense
> to ifdef, just to make the code more understandable.

Ok, will add that.
--
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/