linux-kernel - Re: [PATCH] vpda: pds: fix building without debugfs

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Date:   Wed, 19 Jul 2023 16:04:46 -0700
From:   Shannon Nelson <shannon.nelson@....com>
To:     Arnd Bergmann <arnd@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vpda: pds: fix building without debugfs

On 7/19/23 12:40 PM, Arnd Bergmann wrote:
> 
> From: Arnd Bergmann <arnd@...db.de>
> 
> The new debugfs code still gets called when debugfs is disabled, resulting
> in a link failure:
> 
> ERROR: modpost: "pds_vdpa_debugfs_del_vdpadev" [drivers/vdpa/pds/pds_vdpa.ko] undefined!
> ERROR: modpost: "pds_vdpa_debugfs_add_vdpadev" [drivers/vdpa/pds/pds_vdpa.ko] undefined!
> ERROR: modpost: "pds_vdpa_debugfs_reset_vdpadev" [drivers/vdpa/pds/pds_vdpa.ko] undefined!
> ERROR: modpost: "pds_vdpa_debugfs_create" [drivers/vdpa/pds/pds_vdpa.ko] undefined!
> ERROR: modpost: "pds_vdpa_debugfs_add_ident" [drivers/vdpa/pds/pds_vdpa.ko] undefined!
> ERROR: modpost: "pds_vdpa_debugfs_destroy" [drivers/vdpa/pds/pds_vdpa.ko] undefined!
> ERROR: modpost: "pds_vdpa_debugfs_add_pcidev" [drivers/vdpa/pds/pds_vdpa.ko] undefined!
> 
> Add the usual #if/#else block around the declarations to supply empty stubs
> for the broken case.
> 
> Fixes: 151cc834f3dda ("pds_vdpa: add support for vdpa and vdpamgmt interfaces")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks, Arnd.  There is a patch already intended to address this:
https://lore.kernel.org/netdev/20230706231718.54198-1-shannon.nelson@amd.com/

Maybe it needs to get pulled in through a different tree to show up quicker?

sln


> ---
>   drivers/vdpa/pds/debugfs.h | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/vdpa/pds/debugfs.h b/drivers/vdpa/pds/debugfs.h
> index c088a4e8f1e92..6fbd64ace13a3 100644
> --- a/drivers/vdpa/pds/debugfs.h
> +++ b/drivers/vdpa/pds/debugfs.h
> @@ -6,6 +6,7 @@
> 
>   #include <linux/debugfs.h>
> 
> +#ifdef CONFIG_DEBUG_FS
>   void pds_vdpa_debugfs_create(void);
>   void pds_vdpa_debugfs_destroy(void);
>   void pds_vdpa_debugfs_add_pcidev(struct pds_vdpa_aux *vdpa_aux);
> @@ -13,5 +14,14 @@ void pds_vdpa_debugfs_add_ident(struct pds_vdpa_aux *vdpa_aux);
>   void pds_vdpa_debugfs_add_vdpadev(struct pds_vdpa_aux *vdpa_aux);
>   void pds_vdpa_debugfs_del_vdpadev(struct pds_vdpa_aux *vdpa_aux);
>   void pds_vdpa_debugfs_reset_vdpadev(struct pds_vdpa_aux *vdpa_aux);
> +#else
> +static inline void pds_vdpa_debugfs_create(void) { }
> +static inline void pds_vdpa_debugfs_destroy(void) { }
> +static inline void pds_vdpa_debugfs_add_pcidev(struct pds_vdpa_aux *vdpa_aux) { }
> +static inline void pds_vdpa_debugfs_add_ident(struct pds_vdpa_aux *vdpa_aux) { }
> +static inline void pds_vdpa_debugfs_add_vdpadev(struct pds_vdpa_aux *vdpa_aux) { }
> +static inline void pds_vdpa_debugfs_del_vdpadev(struct pds_vdpa_aux *vdpa_aux) { }
> +static inline void pds_vdpa_debugfs_reset_vdpadev(struct pds_vdpa_aux *vdpa_aux) { }
> +#endif
> 
>   #endif /* _PDS_VDPA_DEBUGFS_H_ */
> --
> 2.39.2
>