linux-kernel - Re: [PATCH] efi: sysfb_efi: guard EFI-specific code with CONFIG

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Message-ID: <CAMj1kXFGrTQHONPCJMvMJ5aaswh1YF9aCcufS_9YsS5F+uYJpQ@mail.gmail.com>
Date: Wed, 15 Jan 2025 15:46:46 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: Yu-Chun Lin <eleanor15x@...il.com>
Cc: linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org, 
	visitorckw@...il.com, jserv@...s.ncku.edu.tw, 
	kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] efi: sysfb_efi: guard EFI-specific code with CONFIG_EFI

On Wed, 15 Jan 2025 at 15:17, Yu-Chun Lin <eleanor15x@...il.com> wrote:
>
> As reported by the kernel test robot, the following warnings occur:
>
> >> drivers/firmware/efi/sysfb_efi.c:331:39: warning: 'efifb_fwnode_ops' defined but not used [-Wunused-const-variable=]
>      331 | static const struct fwnode_operations efifb_fwnode_ops = {
>          |                                       ^~~~~~~~~~~~~~~~
> >> drivers/firmware/efi/sysfb_efi.c:240:35: warning: 'efifb_dmi_swap_width_height' defined but not used [-Wunused-const-variable=]
>      240 | static const struct dmi_system_id efifb_dmi_swap_width_height[] __initconst = {
>          |                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> >> drivers/firmware/efi/sysfb_efi.c:190:35: warning: 'efifb_dmi_system_table' defined but not used [-Wunused-const-variable=]
>      190 | static const struct dmi_system_id efifb_dmi_system_table[] __initconst = {
>          |                                   ^~~~~~~~~~~~~~~~~~~~~~
>
> Unused variables, functions, and macro are conditionally compiled under
> CONFIG_EFI. This includes 'efifb_fwnode_ops',
> 'efifb_dmi_swap_width_height[]', 'efifb_dmi_system_table[]',
> 'efifb_add_links', 'find_pci_overlap_node','efifb_set_system',
> 'efifb_overlaps_pci_range', and the 'EFIFB_DMI_SYSTEM_ID' macro.
>
> Suppress unused symbol warnings and ensure inclusion only in relevant
> configurations.
>
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202501051626.SMkizYIE-lkp@intel.com/
> Signed-off-by: Yu-Chun Lin <eleanor15x@...il.com>
> ---
>  drivers/firmware/efi/sysfb_efi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>

Is your patch better than the one already in linux-next?

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=19fdc68aa7b90b1

> diff --git a/drivers/firmware/efi/sysfb_efi.c b/drivers/firmware/efi/sysfb_efi.c
> index cc807ed35aed..4efe383cc470 100644
> --- a/drivers/firmware/efi/sysfb_efi.c
> +++ b/drivers/firmware/efi/sysfb_efi.c
> @@ -174,6 +174,7 @@ static int __init efifb_set_system(const struct dmi_system_id *id)
>         return 1;
>  }
>
> +#ifdef CONFIG_EFI
>  #define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid)              \
>         {                                                       \
>                 efifb_set_system,                               \
> @@ -346,7 +347,6 @@ static const struct fwnode_operations efifb_fwnode_ops = {
>         .add_links = efifb_add_links,
>  };
>
> -#ifdef CONFIG_EFI
>  static struct fwnode_handle efifb_fwnode;
>
>  __init void sysfb_apply_efi_quirks(void)
> --
> 2.43.0
>