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Subject[patch v3 36/36] Add extra arch overrides to asm-generic/checksum.h
There are plausible reasons for architectures to provide their own
versions of csum_partial_copy_nocheck and csum_tcpudp_magic.
By protecting these, the architecture can still re-use the
asm-generic checksum.h, instead of copying it.

Signed-off-by: Linas Vepstas <>
Acked-by: Arnd Bergmann <>

include/asm-generic/checksum.h | 4 ++++
1 file changed, 4 insertions(+)

Index: linux-hexagon-kernel/include/asm-generic/checksum.h
--- linux-hexagon-kernel.orig/include/asm-generic/checksum.h 2011-09-03 20:14:46.214943511 -0500
+++ linux-hexagon-kernel/include/asm-generic/checksum.h 2011-09-03 20:14:59.874981811 -0500
@@ -33,8 +33,10 @@
extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
int len, __wsum sum, int *csum_err);

+#ifndef csum_partial_copy_nocheck
#define csum_partial_copy_nocheck(src, dst, len, sum) \
csum_partial_copy((src), (dst), (len), (sum))

* This is a version of ip_compute_csum() optimized for IP headers,
@@ -63,12 +65,14 @@
unsigned short proto, __wsum sum);

+#ifndef csum_tcpudp_magic
static inline __sum16
csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
unsigned short proto, __wsum sum)
return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));

* this routine is used for miscellaneous IP-like checksums, mainly

Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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