linux-kernel - Re: [PATCH 1/2] efi: add a function for transferring status to string

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Date:   Thu, 12 Dec 2019 11:20:48 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     "Lee, Chun-Yi" <joeyli.kernel@...il.com>
Cc:     James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        David Howells <dhowells@...hat.com>,
        Josh Boyer <jwboyer@...oraproject.org>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        linux-efi <linux-efi@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Lee, Chun-Yi" <jlee@...e.com>
Subject: Re: [PATCH 1/2] efi: add a function for transferring status to string

On Thu, 12 Dec 2019 at 10:38, Lee, Chun-Yi <joeyli.kernel@...il.com> wrote:
>
> This function can be used to transfer EFI status code to string
> to improve the readability of debug log.
>
> Signed-off-by: "Lee, Chun-Yi" <jlee@...e.com>

I think I mentioned this the last time you sent this patch: by making
this a static inline, those strings will be copied into each object
file that uses this routine.
Instead, please make it an ordinary function.

> ---
>  include/linux/efi.h | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index d87acf62958e..08daf4cdd807 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -42,6 +42,32 @@
>  #define EFI_ABORTED            (21 | (1UL << (BITS_PER_LONG-1)))
>  #define EFI_SECURITY_VIOLATION (26 | (1UL << (BITS_PER_LONG-1)))
>
> +#define EFI_STATUS_STR(_status) \
> +       case EFI_##_status: \
> +               return "EFI_" __stringify(_status);
> +
> +static inline char *
> +efi_status_to_str(unsigned long status)
> +{
> +       switch (status) {
> +       EFI_STATUS_STR(SUCCESS)
> +       EFI_STATUS_STR(LOAD_ERROR)
> +       EFI_STATUS_STR(INVALID_PARAMETER)
> +       EFI_STATUS_STR(UNSUPPORTED)
> +       EFI_STATUS_STR(BAD_BUFFER_SIZE)
> +       EFI_STATUS_STR(BUFFER_TOO_SMALL)
> +       EFI_STATUS_STR(NOT_READY)
> +       EFI_STATUS_STR(DEVICE_ERROR)
> +       EFI_STATUS_STR(WRITE_PROTECTED)
> +       EFI_STATUS_STR(OUT_OF_RESOURCES)
> +       EFI_STATUS_STR(NOT_FOUND)
> +       EFI_STATUS_STR(ABORTED)
> +       EFI_STATUS_STR(SECURITY_VIOLATION)
> +       }
> +
> +       return "";
> +}
> +
>  typedef unsigned long efi_status_t;
>  typedef u8 efi_bool_t;
>  typedef u16 efi_char16_t;              /* UNICODE character */
> --
> 2.16.4
>