linux-kernel - [PATCH] net, uapi: remove inclusion of arpa/inet.h

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Date:   Tue, 29 Mar 2022 14:29:45 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Jon Maloy <jmaloy@...hat.com>, Ying Xue <ying.xue@...driver.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>, netdev@...r.kernel.org,
        tipc-discussion@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: [PATCH] net, uapi: remove inclusion of arpa/inet.h

Testing out CONFIG_UAPI_HEADER_TEST=y with a prebuilt Bionic sysroot
from Android's SDK, I encountered an error:

  HDRTEST usr/include/linux/fsi.h
In file included from <built-in>:1:
In file included from ./usr/include/linux/tipc_config.h:46:
prebuilts/ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/arpa/inet.h:39:1:
error: unknown type name 'in_addr_t'
in_addr_t inet_addr(const char* __s);
^

This is because Bionic has a bug in its inclusion chain. I sent a patch
to fix that, but looking closer at include/uapi/linux/tipc_config.h,
there's a comment that it includes arpa/inet.h for ntohs; but ntohs is
already defined in include/linux/byteorder/generic.h which is already
included in include/uapi/linux/tipc_config.h. There are no __KERNEL__
guards on include/linux/byteorder/generic.h's definition of ntohs. So
besides fixing Bionic, it looks like we can additionally remove this
unnecessary header inclusion.

Link: https://android-review.googlesource.com/c/platform/bionic/+/2048127
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
 include/uapi/linux/tipc_config.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/include/uapi/linux/tipc_config.h b/include/uapi/linux/tipc_config.h
index 4dfc05651c98..b38374d5f192 100644
--- a/include/uapi/linux/tipc_config.h
+++ b/include/uapi/linux/tipc_config.h
@@ -43,10 +43,6 @@
 #include <linux/tipc.h>
 #include <asm/byteorder.h>
 
-#ifndef __KERNEL__
-#include <arpa/inet.h> /* for ntohs etc. */
-#endif
-
 /*
  * Configuration
  *

base-commit: 5efabdadcf4a5b9a37847ecc85ba71cf2eff0fcf
prerequisite-patch-id: 0c2abf2af8051f4b37a70ef11b7d2fc2a3ec7181
-- 
2.35.1.1021.g381101b075-goog