linux-kernel - Re: [PATCH] firmware: fix -Wunused-function compiler warnings

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Date:   Wed, 31 Jul 2019 14:44:37 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Qian Cai <cai@....pw>
Cc:     mcgrof@...nel.org, issor.oruam@...il.com, tiwai@...e.de,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] firmware: fix -Wunused-function compiler warnings

On Tue, Jul 23, 2019 at 09:32:02AM -0400, Qian Cai wrote:
> The commit 5342e7093ff2 ("firmware: Factor out the paged buffer handling
> code") introduced a few compilation warnings when
> CONFIG_FW_LOADER_USER_HELPER=n due to fw_grow_paged_buf() and
> fw_grow_paged_buf() are only used in
> drivers/base/firmware_loader/fallback.c, and the later will only be
> built if CONFIG_FW_LOADER_USER_HELPER=y.
> 
> In file included from drivers/base/firmware_loader/main.c:41:
> drivers/base/firmware_loader/firmware.h:145:12: warning:
> 'fw_map_paged_buf' defined but not used [-Wunused-function]
>  static int fw_map_paged_buf(struct fw_priv *fw_priv) { return -ENXIO; }
>             ^~~~~~~~~~~~~~~~
> drivers/base/firmware_loader/firmware.h:144:12: warning:
> 'fw_grow_paged_buf' defined but not used [-Wunused-function]
>  static int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed)
> { return -ENXIO; }
> 
> Fix it by removing those unused functions all together when
> CONFIG_FW_LOADER_USER_HELPER=n.
> 
> Fixes: 5342e7093ff2 ("firmware: Factor out the paged buffer handling code")
> Signed-off-by: Qian Cai <cai@....pw>
> ---
>  drivers/base/firmware_loader/firmware.h | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/base/firmware_loader/firmware.h b/drivers/base/firmware_loader/firmware.h
> index 842e63f19f22..e74117bf8587 100644
> --- a/drivers/base/firmware_loader/firmware.h
> +++ b/drivers/base/firmware_loader/firmware.h
> @@ -141,8 +141,6 @@ int assign_fw(struct firmware *fw, struct device *device,
>  int fw_map_paged_buf(struct fw_priv *fw_priv);
>  #else
>  static inline void fw_free_paged_buf(struct fw_priv *fw_priv) {}
> -static int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed) { return -ENXIO; }
> -static int fw_map_paged_buf(struct fw_priv *fw_priv) { return -ENXIO; }
>  #endif
>  
>  #endif /* __FIRMWARE_LOADER_H */
> -- 
> 1.8.3.1
> 

Is this still needed with 5.3-rc2?  If so, please rebase and resend as
it does not apply to there.

thanks,

greg k-h