netdev - Re: [PATCH] uapi/if_ether.h: move __UAPI_DEF

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Date:   Tue, 13 Feb 2018 11:24:07 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     hauke@...ke-m.de
Cc:     linux-api@...r.kernel.org, netdev@...r.kernel.org,
        g.nault@...halink.fr, stable@...r.kernel.org
Subject: Re: [PATCH] uapi/if_ether.h: move __UAPI_DEF_ETHHDR libc define

From: Hauke Mehrtens <hauke@...ke-m.de>
Date: Tue, 13 Feb 2018 00:01:26 +0100

> On 02/12/2018 11:59 PM, Hauke Mehrtens wrote:
>> This fixes a compile problem of some user space applications by not
>> including linux/libc-compat.h in uapi/if_ether.h.
>> 
>> linux/libc-compat.h checks which "features" the header files, included
>> from the libc, provide to make the Linux kernel uapi header files only
>> provide no conflicting structures and enums. If a user application mixes
>> kernel headers and libc headers it could happen that linux/libc-compat.h
>> gets included too early where not all other libc headers are included
>> yet. Then the linux/libc-compat.h would not prevent all the
>> redefinitions and we run into compile problems.
>> This patch removes the include of linux/libc-compat.h from
>> uapi/if_ether.h to fix the recently introduced case, but not all as this
>> is more or less impossible.
>> 
>> It is no problem to do the check directly in the if_ether.h file and not
>> in libc-compat.h as this does not need any fancy glibc header detection
>> as glibc never provided struct ethhdr and should define
>> __UAPI_DEF_ETHHDR by them self when they will provide this.
>> 
>> The following test program did not compile correctly any more:
>> 
>> int main(void)
>> {
>>         return 0;
>> }
> 
> git removed the included here:
> 
> #include <linux/if_ether.h>
> #include <netinet/in.h>
> #include <linux/in.h>
> 
> int main(void)
> {
> 	return 0;
> }

Applied with this fixed up, thanks!