powerpc: Use generic checksum code in little endian

We need to fix some endian issues in our checksum code. For now
just enable the generic checksum routines for little endian builds.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

4 files changed, 17 insertions, 2 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 38f3b7e47ec5..2c69c43ba68e 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -139,6 +139,9 @@ config PPC
         select OLD_SIGACTION if PPC32
         select HAVE_DEBUG_STACKOVERFLOW
 
+config GENERIC_CSUM
+        def_bool CPU_LITTLE_ENDIAN
+
 config EARLY_PRINTK
         bool
         default y
diff --git a/arch/powerpc/include/asm/checksum.h b/arch/powerpc/include/asm/checksum.h
index ce0c28495f9a..8251a3ba870f 100644
--- a/arch/powerpc/include/asm/checksum.h
+++ b/arch/powerpc/include/asm/checksum.h
@@ -14,6 +14,9 @@
  * which always checksum on 4 octet boundaries.  ihl is the number
  * of 32-bit words and is always >= 5.
  */
+#ifdef CONFIG_GENERIC_CSUM
+#include <asm-generic/checksum.h>
+#else
 extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
 
 /*
@@ -123,5 +126,7 @@ static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
         return sum;
 #endif
 }
+
+#endif
 #endif /* __KERNEL__ */
 #endif
diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index 21646dbe1bb3..3b485c5cff10 100644
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -79,10 +79,12 @@ EXPORT_SYMBOL(strlen);
 EXPORT_SYMBOL(strcmp);
 EXPORT_SYMBOL(strncmp);
 
+#ifndef CONFIG_GENERIC_CSUM
 EXPORT_SYMBOL(csum_partial);
 EXPORT_SYMBOL(csum_partial_copy_generic);
 EXPORT_SYMBOL(ip_fast_csum);
 EXPORT_SYMBOL(csum_tcpudp_magic);
+#endif
 
 EXPORT_SYMBOL(__copy_tofrom_user);
 EXPORT_SYMBOL(__clear_user);
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile
index 450433276699..33ab26112123 100644
--- a/arch/powerpc/lib/Makefile
+++ b/arch/powerpc/lib/Makefile
@@ -10,15 +10,20 @@ CFLAGS_REMOVE_code-patching.o = -pg
 CFLAGS_REMOVE_feature-fixups.o = -pg
 
 obj-y                   := string.o alloc.o \
-                           checksum_$(CONFIG_WORD_SIZE).o crtsavres.o
+                           crtsavres.o
 obj-$(CONFIG_PPC32)     += div64.o copy_32.o
 obj-$(CONFIG_HAS_IOMEM) += devres.o
 
 obj-$(CONFIG_PPC64)     += copypage_64.o copyuser_64.o \
                            memcpy_64.o usercopy_64.o mem_64.o string.o \
-                           checksum_wrappers_64.o hweight_64.o \
+                           hweight_64.o \
                            copyuser_power7.o string_64.o copypage_power7.o \
                            memcpy_power7.o
+ifeq ($(CONFIG_GENERIC_CSUM),)
+obj-y                   += checksum_$(CONFIG_WORD_SIZE).o
+obj-$(CONFIG_PPC64)     += checksum_wrappers_64.o
+endif
+
 obj-$(CONFIG_PPC_EMULATE_SSTEP) += sstep.o ldstfp.o
 
 ifeq ($(CONFIG_PPC64),y)