powerpc: put csum_tcpudp_magic inline

csum_tcpudp_magic() is only a few instructions, and does modify
really few registers. So it is not worth having it as a separate
function and suffer function branching and saving of volatile
registers.

This patch makes it inline by use of the already existing
csum_tcpudp_nofold() function.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>

arch/powerpc/include/asm/checksum.h

@@ -19,15 +19,6 @@
 #else
 extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
 
-/*
- * computes the checksum of the TCP/UDP pseudo-header
- * returns a 16-bit checksum, already complemented
- */
-extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
-					unsigned short len,
-					unsigned short proto,
-					__wsum sum);
-
 /*
  * computes the checksum of a memory block at buff, length len,
  * and adds in "sum" (32-bit)
@@ -127,6 +118,18 @@ static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 #endif
 }
 
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+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));
+}
+
 #endif
 #endif /* __KERNEL__ */
 #endif

arch/powerpc/lib/checksum_32.S

@@ -40,22 +40,6 @@ _GLOBAL(ip_fast_csum)
 	srwi	r3,r3,16
 	blr
 
-/*
- * Compute checksum of TCP or UDP pseudo-header:
- *   csum_tcpudp_magic(saddr, daddr, len, proto, sum)
- */	
-_GLOBAL(csum_tcpudp_magic)
-	rlwimi	r5,r6,16,0,15	/* put proto in upper half of len */
-	addc	r0,r3,r4	/* add 4 32-bit words together */
-	adde	r0,r0,r5
-	adde	r0,r0,r7
-	addze	r0,r0		/* add in final carry */
-	rlwinm	r3,r0,16,0,31	/* fold two halves together */
-	add	r3,r0,r3
-	not	r3,r3
-	srwi	r3,r3,16
-	blr
-
 /*
  * computes the checksum of a memory block at buff, length len,
  * and adds in "sum" (32-bit)

arch/powerpc/lib/checksum_64.S

@@ -44,27 +44,6 @@ _GLOBAL(ip_fast_csum)
 	srwi	r3,r3,16
 	blr
 
-/*
- * Compute checksum of TCP or UDP pseudo-header:
- *   csum_tcpudp_magic(r3=saddr, r4=daddr, r5=len, r6=proto, r7=sum)
- * No real gain trying to do this specially for 64 bit, but
- * the 32 bit addition may spill into the upper bits of
- * the doubleword so we still must fold it down from 64.
- */	
-_GLOBAL(csum_tcpudp_magic)
-	rlwimi	r5,r6,16,0,15	/* put proto in upper half of len */
-	addc	r0,r3,r4	/* add 4 32-bit words together */
-	adde	r0,r0,r5
-	adde	r0,r0,r7
-        rldicl  r4,r0,32,0      /* fold 64 bit value */
-        add     r0,r4,r0
-        srdi    r0,r0,32
-	rlwinm	r3,r0,16,0,31	/* fold two halves together */
-	add	r3,r0,r3
-	not	r3,r3
-	srwi	r3,r3,16
-	blr
-
 /*
  * Computes the checksum of a memory block at buff, length len,
  * and adds in "sum" (32-bit).