linux-kernel - Re: [PATCH 1/4] ipc/sem.c: convert undo structures to struct list

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] [day] [month] [year] [list]

Message-ID: <484CD406.9080607@bull.net>
Date:	Mon, 09 Jun 2008 08:56:06 +0200
From:	Nadia Derbey <Nadia.Derbey@...l.net>
To:	Manfred Spraul <manfred@...orfullife.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] ipc/sem.c: convert undo structures to struct list_head

Manfred Spraul wrote:
> Nadia Derbey wrote:
> 
>> Manfred Spraul wrote:
>>
>>> The undo structures contain two linked lists, the
>>> attached patch replaces them with generic struct list_head lists.
>>
>>
>> If I'm not wrong the undo list is a singly-linked list.
>> So here we are moving from a set of 4 pointers to a set of 8 pointers.
>> It's true that this makes the code much much more readable and clear, 
>> but I was wondering if it's worth?
>>
> IMHO yes: Everything is allocated on demand and memory is not that 
> expensive.
> 
> With regard to the asserts: I'm a big fan of asserts, I usually use them 
> to document the locking.

And you're completely right: when I see your new semaphore code, we can 
easily see what is the lock needed to protect a given field.

> Perhaps assert_spin_locked() should evalute to a nop() for 
> non-CONFIG_DEBUG builds?

Well, it's unconditionally defined as a BUG_ON(!spin_is_locked())

Regards,
Nadia




--
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/