linux-kernel - Re: [PATCH v10 1/4] cgroups: use bitmask to filter for_each

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Message-ID: <20150426160909.GC1499@htj.duckdns.org>
Date:	Sun, 26 Apr 2015 12:09:09 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Aleksa Sarai <cyphar@...har.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, lizefan@...wei.com,
	mingo@...hat.com, richard@....at,
	Frédéric Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH v10 1/4] cgroups: use bitmask to filter for_each_subsys

Hello,

On Mon, Apr 27, 2015 at 02:05:47AM +1000, Aleksa Sarai wrote:
> In addition, there are a bunch of cgroup_* functions that use unsigned
> ints for bitops (cgroup_calc_child_subsys_mask, rebind_subsystems,
> cgroup_print_ss_mask). Is there a better solution to this problem, or
> should I just switch back to my naive solution?

Hmmmm... You can either convert all masks to ulong (which is fine) or
do something like the following.

#define for_each_subsys_which(ss_mask, ss, ssid)            \
    unsigned long __tmp_mask = (ss_mask);		    \
    for_each_set_bit(ssid, &__tmp_mask, CGROUP_SUBSYS_COUNT)\
            if ((ss) = group_subsys[ssid] && false)         \
                    ;                                       \
             else

Thanks.

-- 
tejun
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