linux-kernel - Re: [PATCH 01/18] kernel: add bl

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: <87hbgx5c7z.fsf@basil.nowhere.org>
Date:	Fri, 08 Oct 2010 10:18:40 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/18] kernel: add bl_list

Dave Chinner <david@...morbit.com> writes:

> +static inline void __hlist_bl_del(struct hlist_bl_node *n)
> +{
> +	struct hlist_bl_node *next = n->next;
> +	struct hlist_bl_node **pprev = n->pprev;
> +
> +	LIST_BL_BUG_ON((unsigned long)n & LIST_BL_LOCKMASK);
> +
> +	/* pprev may be `first`, so be careful not to lose the lock bit */
> +	*pprev = (struct hlist_bl_node *)
> +			((unsigned long)next |
> +			 ((unsigned long)*pprev & LIST_BL_LOCKMASK));
> +	if (next)
> +		next->pprev = pprev;
> +}

Should this set n->pprev to NULL so that unhashed returns true
afterwards?


> +
> +static inline void hlist_bl_del(struct hlist_bl_node *n)
> +{
> +	__hlist_bl_del(n);
> +	n->next = BL_LIST_POISON1;
> +	n->pprev = BL_LIST_POISON2;
> +}

Ok so unhashed only works once. Seems unsymmetric.

Other than that looks good to me.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
--
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/