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Date:   Thu, 21 Nov 2019 12:52:32 +0100
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Kusanagi Kouichi <slash@ac.auone-net.jp>
Cc:     "Rafael J. Wysocki" <rafael@kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@redhat.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] debugfs: Fix !DEBUG_FS debugfs_create_automount
Message-ID: <20191121115232.GC427938@kroah.com>
References: <20191121102021787.MLMY.25002.ppp.dion.ne.jp@dmta0003.auone-net.jp>
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On Thu, Nov 21, 2019 at 07:20:21PM +0900, Kusanagi Kouichi wrote:
> If DEBUG_FS=n, compile fails with the following error:
> 
> kernel/trace/trace.c: In function 'tracing_init_dentry':
> kernel/trace/trace.c:8658:9: error: passing argument 3 of 'debugfs_create_automount' from incompatible pointer type [-Werror=incompatible-pointer-types]
>  8658 |         trace_automount, NULL);
>       |         ^~~~~~~~~~~~~~~
>       |         |
>       |         struct vfsmount * (*)(struct dentry *, void *)
> In file included from kernel/trace/trace.c:24:
> ./include/linux/debugfs.h:206:25: note: expected 'struct vfsmount * (*)(void *)' but argument is of type 'struct vfsmount * (*)(struct dentry *, void *)'
>   206 |      struct vfsmount *(*f)(void *),
>       |      ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
> 
> Signed-off-by: Kusanagi Kouichi <slash@ac.auone-net.jp>
> ---
>  include/linux/debugfs.h | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)

Has this always been a problem, or did it just show up due to some other
kernel change?

thanks,

greg k-h