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

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

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

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);

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)