Re: [PATCH AUTOSEL 4.9 85/91] debugfs: Fix !DEBUG_FS debugfs_create_automount

[Greg Kroah-Hartman]

On Tue, Dec 10, 2019 at 05:30:29PM -0500, Sasha Levin wrote:
> From: Kusanagi Kouichi <slash@xxxxxxxxxxxxxxx>
> 
> [ Upstream commit 4250b047039d324e0ff65267c8beb5bad5052a86 ]
> 
> 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@xxxxxxxxxxxxxxx>
> Link: https://lore.kernel.org/r/20191121102021787.MLMY.25002.ppp.dion.ne.jp@xxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

This patch is only needed for 5.4 and newer kernels.  No need to
backport it anywhere, please drop it from all of these trees.

thanks,

greg k-h