linux-kernel - Re: [PATCH v3 03/12] locking/ww_mutex: Extract stamp comparison to __ww_mutex_stamp

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Date:   Thu, 22 Dec 2016 09:58:30 +0800
From:   zhoucm1 <david1.zhou@....com>
To:     Nicolai Hähnle <nhaehnle@...il.com>,
        <linux-kernel@...r.kernel.org>
CC:     Maarten Lankhorst <dev@...ankhorst.nl>,
        Nicolai Hähnle <Nicolai.Haehnle@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        <dri-devel@...ts.freedesktop.org>, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v3 03/12] locking/ww_mutex: Extract stamp comparison to
 __ww_mutex_stamp_after



On 2016年12月22日 02:46, Nicolai Hähnle wrote:
> +static inline bool __sched
> +__ww_ctx_stamp_after(struct ww_acquire_ctx *a, struct ww_acquire_ctx *b)
> +{
> +	return a->stamp - b->stamp <= LONG_MAX &&
> +	       (a->stamp != b->stamp || a > b);
I want to ask a stupid question, why a can compare with b? They are 
pointers of structure. Isn't stamp enough for compare?

Thanks,
David Zhou