linux-kernel - Re: [PATCH resend] uapi: fix linux/nfc.h userspace compilation errors

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Date:   Sun, 26 Dec 2021 12:42:00 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     "Dmitry V. Levin" <ldv@...linux.org>
Cc:     Arnd Bergmann <arnd@...db.de>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH resend] uapi: fix linux/nfc.h userspace compilation errors

On 26/12/2021 00:42, Dmitry V. Levin wrote:
> Replace sa_family_t with __kernel_sa_family_t to fix the following
> linux/nfc.h userspace compilation errors:
> 
> /usr/include/linux/nfc.h:266:2: error: unknown type name 'sa_family_t'
>   sa_family_t sa_family;
> /usr/include/linux/nfc.h:274:2: error: unknown type name 'sa_family_t'
>   sa_family_t sa_family;
> 
> Link: https://lore.kernel.org/lkml/20170220181613.GB11185@altlinux.org/

Please skip the link. There will be link added for current patch which
leads to this discussion. There was no discussion in 2017.

> Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
> ---
>  The patch was submitted almost 5 years ago, and I was under impression
>  that it was applied among others of this kind, but, apparently,
>  it's still relevant.
> 
>  include/uapi/linux/nfc.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/uapi/linux/nfc.h b/include/uapi/linux/nfc.h
> index f6e3c8c9c744..aadad43d943a 100644
> --- a/include/uapi/linux/nfc.h
> +++ b/include/uapi/linux/nfc.h
> @@ -263,7 +263,7 @@ enum nfc_sdp_attr {
>  #define NFC_SE_ENABLED  0x1
>  
>  struct sockaddr_nfc {
> -	sa_family_t sa_family;
> +	__kernel_sa_family_t sa_family;

include/uapi/linux/nfc.h includes linux/socket.h which defines typedef:
  __kernel_sa_family_t    sa_family_t;
so how exactly the build is being fixed? How to reproduce it?

Best regards,
Krzysztof