netdev - Re: [PATCH v2 1/2] kernfs: Convert to u64 id

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Date:   Mon, 4 Nov 2019 08:59:01 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>,
        Li Zefan <lizefan@...wei.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Song Liu <liu.song.a23@...il.com>, cgroups@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Jens Axboe <axboe@...nel.dk>,
        "David S. Miller" <davem@...emloft.net>,
        linux-block@...r.kernel.org, bpf@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v2 1/2] kernfs: Convert to u64 id

On Mon,  4 Nov 2019 17:45:19 +0900
Namhyung Kim <namhyung@...nel.org> wrote:

> From: Tejun Heo <tj@...nel.org>
> 
> The kernfs_id was an union type sharing a 64bit id with 32bit ino +
> gen.  But it resulted in using 32bit inode even on 64bit systems.
> Also dealing with an union is annoying especially if you just want to
> use a single id.
> 
> Thus let's get rid of the kernfs_node_id type and use u64 directly.
> The upper 32bit is used for gen and lower is for ino on 32bit systems.
> The kernfs_id_ino() and kernfs_id_gen() helpers will take care of the
> bit handling depends on the system word size.
> 
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Alexei Starovoitov <ast@...nel.org>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Martin KaFai Lau <kafai@...com>
> Cc: Song Liu <songliubraving@...com>
> Cc: Yonghong Song <yhs@...com>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: linux-block@...r.kernel.org
> Cc: bpf@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Signed-off-by: Tejun Heo <tj@...nel.org>
> [namhyung: fix build error in bpf_get_current_cgroup_id()]
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  fs/kernfs/dir.c                  | 36 ++++++++-----
>  fs/kernfs/file.c                 |  4 +-
>  fs/kernfs/inode.c                |  4 +-
>  fs/kernfs/kernfs-internal.h      |  2 -
>  fs/kernfs/mount.c                | 92 +++++++++++++++++++-------------
>  include/linux/cgroup.h           | 17 +++---
>  include/linux/exportfs.h         |  5 ++
>  include/linux/kernfs.h           | 47 +++++++++-------

>  include/trace/events/writeback.h | 92 ++++++++++++++++----------------

I only looked at the above file, and didn't see anything bad about it.

Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve


>  kernel/bpf/helpers.c             |  2 +-
>  kernel/cgroup/cgroup.c           |  5 +-
>  kernel/trace/blktrace.c          | 66 +++++++++++------------
>  net/core/filter.c                |  4 +-
>  13 files changed, 207 insertions(+), 169 deletions(-)