linux-kernel - Re: [PATCH] cpuset: fix return value of cpuset

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Date:	Wed, 27 Feb 2008 16:49:44 -0800
From:	"Paul Menage" <menage@...gle.com>
To:	"Paul Jackson" <pj@....com>
Cc:	"Li Zefan" <lizf@...fujitsu.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpuset: fix return value of cpuset_populate()

On Tue, Feb 26, 2008 at 11:41 PM, Paul Jackson <pj@....com> wrote:
>
>  - no need to check err == 0
>  - the last return value of cgroup_add_file() is ignored
>
>  Signed-off-by: Li Zefan <lizf@...fujitsu.com>

Looks fine from a cleanliness PoV, although since we don't actually do
anything with an error result from subsys->populate() (a behaviour
that I sort of inherited from cpusets ...) it won't make a whole lot
of difference to the code.

A better change would be to make cpuset_populate() use cgroup_add_files().

Paul

>  ---
>   kernel/cpuset.c |    4 ++--
>   1 files changed, 2 insertions(+), 2 deletions(-)
>
>  diff --git a/kernel/cpuset.c b/kernel/cpuset.c
>  index 3e296ed..1c5b2d2 100644
>  --- a/kernel/cpuset.c
>  +++ b/kernel/cpuset.c
>  @@ -1482,10 +1482,10 @@ static int cpuset_populate(struct cgroup_subsys *ss, struct cgroup *cont)
>         if ((err = cgroup_add_file(cont, ss, &cft_spread_slab)) < 0)
>                 return err;
>         /* memory_pressure_enabled is in root cpuset only */
>  -       if (err == 0 && !cont->parent)
>  +       if (!cont->parent)
>                 err = cgroup_add_file(cont, ss,
>                                          &cft_memory_pressure_enabled);
>  -       return 0;
>  +       return err;
>   }
>
>   /*
>  --
>  1.5.4.rc3
>
>
>  --
>                   I won't rest till it's the best ...
>                   Programmer, Linux Scalability
>                   Paul Jackson <pj@....com> 1.940.382.4214
>
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