linux-kernel - Re: [patch 3/7] mm: speculative page references

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:	Fri, 06 Jun 2008 16:20:04 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	npiggin@...e.de
Cc:	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	benh@...nel.crashing.org, paulus@...ba.org,
	Paul E McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: [patch 3/7] mm: speculative page references

On Thu, 2008-06-05 at 19:43 +1000, npiggin@...e.de wrote:
> plain text document attachment (mm-speculative-get_page-hugh.patch)

> +static inline int page_cache_get_speculative(struct page *page)
> +{
> +	VM_BUG_ON(in_interrupt());
> +
> +#ifndef CONFIG_SMP
> +# ifdef CONFIG_PREEMPT
> +	VM_BUG_ON(!in_atomic());
> +# endif
> +	/*
> +	 * Preempt must be disabled here - we rely on rcu_read_lock doing
> +	 * this for us.

Preemptible RCU is already in the tree, so I guess you'll have to
explcitly disable preemption if you require it.


--
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/