linux-kernel - Re: [PATCH] [v2] efi: fix missing prototype warnings

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Message-ID: <CAJZ5v0grS85Vk6MM9kgHaSp4ta5osdOLSSgc2OiFG0Gev=CynQ@mail.gmail.com>
Date:   Wed, 24 May 2023 16:32:27 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Len Brown <lenb@...nel.org>,
        James Morse <james.morse@....com>,
        Tony Luck <tony.luck@...el.com>,
        Borislav Petkov <bp@...en8.de>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org
Subject: Re: [PATCH] [v2] efi: fix missing prototype warnings

On Tue, May 23, 2023 at 9:02 PM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> The cper.c file needs to include an extra header, and efi_zboot_entry
> needs an extern declaration to avoid these 'make W=1' warnings:
>
> drivers/firmware/efi/libstub/zboot.c:65:1: error: no previous prototype for 'efi_zboot_entry' [-Werror=missing-prototypes]
> drivers/firmware/efi/efi.c:176:16: error: no previous prototype for 'efi_attr_is_visible' [-Werror=missing-prototypes]
> drivers/firmware/efi/cper.c:626:6: error: no previous prototype for 'cper_estatus_print' [-Werror=missing-prototypes]
> drivers/firmware/efi/cper.c:649:5: error: no previous prototype for 'cper_estatus_check_header' [-Werror=missing-prototypes]
> drivers/firmware/efi/cper.c:662:5: error: no previous prototype for 'cper_estatus_check' [-Werror=missing-prototypes]
>
> To make this easier, move the cper specific declarations to
> include/linux/cper.h.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

For the APEI change:

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
> v2: move the prototypes rather than including a file in a different
> subdir
> ---
>  drivers/acpi/apei/apei-internal.h      | 6 ------
>  drivers/acpi/apei/bert.c               | 1 +
>  drivers/firmware/efi/libstub/efistub.h | 3 +++
>  include/linux/cper.h                   | 6 ++++++
>  include/linux/efi.h                    | 2 ++
>  5 files changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/acpi/apei/apei-internal.h b/drivers/acpi/apei/apei-internal.h
> index 1d6ef9654725..67c2c3b959e1 100644
> --- a/drivers/acpi/apei/apei-internal.h
> +++ b/drivers/acpi/apei/apei-internal.h
> @@ -7,7 +7,6 @@
>  #ifndef APEI_INTERNAL_H
>  #define APEI_INTERNAL_H
>
> -#include <linux/cper.h>
>  #include <linux/acpi.h>
>
>  struct apei_exec_context;
> @@ -130,10 +129,5 @@ static inline u32 cper_estatus_len(struct acpi_hest_generic_status *estatus)
>                 return sizeof(*estatus) + estatus->data_length;
>  }
>
> -void cper_estatus_print(const char *pfx,
> -                       const struct acpi_hest_generic_status *estatus);
> -int cper_estatus_check_header(const struct acpi_hest_generic_status *estatus);
> -int cper_estatus_check(const struct acpi_hest_generic_status *estatus);
> -
>  int apei_osc_setup(void);
>  #endif
> diff --git a/drivers/acpi/apei/bert.c b/drivers/acpi/apei/bert.c
> index c23eb75866d0..7514e38d5640 100644
> --- a/drivers/acpi/apei/bert.c
> +++ b/drivers/acpi/apei/bert.c
> @@ -23,6 +23,7 @@
>  #include <linux/module.h>
>  #include <linux/init.h>
>  #include <linux/acpi.h>
> +#include <linux/cper.h>
>  #include <linux/io.h>
>
>  #include "apei-internal.h"
> diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
> index 67d5a20802e0..54a2822cae77 100644
> --- a/drivers/firmware/efi/libstub/efistub.h
> +++ b/drivers/firmware/efi/libstub/efistub.h
> @@ -1133,4 +1133,7 @@ const u8 *__efi_get_smbios_string(const struct efi_smbios_record *record,
>  void efi_remap_image(unsigned long image_base, unsigned alloc_size,
>                      unsigned long code_size);
>
> +asmlinkage efi_status_t __efiapi
> +efi_zboot_entry(efi_handle_t handle, efi_system_table_t *systab);
> +
>  #endif
> diff --git a/include/linux/cper.h b/include/linux/cper.h
> index eacb7dd7b3af..c1a7dc325121 100644
> --- a/include/linux/cper.h
> +++ b/include/linux/cper.h
> @@ -572,4 +572,10 @@ void cper_print_proc_ia(const char *pfx,
>  int cper_mem_err_location(struct cper_mem_err_compact *mem, char *msg);
>  int cper_dimm_err_location(struct cper_mem_err_compact *mem, char *msg);
>
> +struct acpi_hest_generic_status;
> +void cper_estatus_print(const char *pfx,
> +                       const struct acpi_hest_generic_status *estatus);
> +int cper_estatus_check_header(const struct acpi_hest_generic_status *estatus);
> +int cper_estatus_check(const struct acpi_hest_generic_status *estatus);
> +
>  #endif
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index bed3c92cbc31..120af31a5136 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -1349,4 +1349,6 @@ bool efi_config_table_is_usable(const efi_guid_t *guid, unsigned long table)
>         return xen_efi_config_table_is_usable(guid, table);
>  }
>
> +umode_t efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n);
> +
>  #endif /* _LINUX_EFI_H */
> --
> 2.39.2
>