netdev - [PATCH net-next 03/11] net: checksum: drop the linux/uaccess.h include

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Date:   Wed, 25 Jan 2023 23:14:16 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
        Jakub Kicinski <kuba@...nel.org>, linux@...linux.org.uk,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com
Subject: [PATCH net-next 03/11] net: checksum: drop the linux/uaccess.h include

net/checksum.h pulls in linux/uaccess.h which is large.

In the x86 header the include seems to not be needed at all.
ARM on the other hand does not include uaccess.h, even tho
it calls access_ok().

In the generic implementation guard the include of linux/uaccess.h
with the same condition as the code that needs it.

With this change pre-processed net/checksum.h shrinks on x86
from 30616 lines to just 1193.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: linux@...linux.org.uk
CC: tglx@...utronix.de
CC: mingo@...hat.com
CC: bp@...en8.de
CC: dave.hansen@...ux.intel.com
CC: x86@...nel.org
CC: hpa@...or.com
---
 arch/arm/include/asm/checksum.h    | 1 +
 arch/x86/include/asm/checksum_64.h | 1 -
 include/net/checksum.h             | 4 +++-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/checksum.h b/arch/arm/include/asm/checksum.h
index f0f54aef3724..d8a13959bff0 100644
--- a/arch/arm/include/asm/checksum.h
+++ b/arch/arm/include/asm/checksum.h
@@ -11,6 +11,7 @@
 #define __ASM_ARM_CHECKSUM_H
 
 #include <linux/in6.h>
+#include <linux/uaccess.h>
 
 /*
  * computes the checksum of a memory block at buff, length len,
diff --git a/arch/x86/include/asm/checksum_64.h b/arch/x86/include/asm/checksum_64.h
index 407beebadaf4..4d4a47a3a8ab 100644
--- a/arch/x86/include/asm/checksum_64.h
+++ b/arch/x86/include/asm/checksum_64.h
@@ -9,7 +9,6 @@
  */
 
 #include <linux/compiler.h>
-#include <linux/uaccess.h>
 #include <asm/byteorder.h>
 
 /**
diff --git a/include/net/checksum.h b/include/net/checksum.h
index 6bc783b7a06c..1338cb92c8e7 100644
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -18,8 +18,10 @@
 #include <linux/errno.h>
 #include <asm/types.h>
 #include <asm/byteorder.h>
-#include <linux/uaccess.h>
 #include <asm/checksum.h>
+#if !defined(_HAVE_ARCH_COPY_AND_CSUM_FROM_USER) || !defined(HAVE_CSUM_COPY_USER)
+#include <linux/uaccess.h>
+#endif
 
 #ifndef _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
 static __always_inline
-- 
2.39.1