lib/checksum.c: make do_csum optional

Mike Frysinger suggested that do_csum should be optional so that an architecture can use the generic checksum code but still provide an optimized fast-path for the most critical function. This can mean an implementation using inline assembly, or in case of Alpha one using 64-bit arithmetic in C. Cc: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

lib/checksum.c: make do_csum optional
Mike Frysinger suggested that do_csum should be optional so that an architecture can use the generic checksum code but still provide an optimized fast-path for the most critical function. This can mean an implementation using inline assembly, or in case of Alpha one using 64-bit arithmetic in C. Cc: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Arnd Bergmann
1 parent c44ba9f668
Showing 1 changed file with 2 additions and 0 deletions Side-by-side Diff
lib/checksum.c
@@ -37,6 +37,7 @@
  
 #include <asm/byteorder.h>
  
+#ifndef do_csum
 static inline unsigned short from32to16(unsigned int x)
 {
 	/* add up 16-bit and 16-bit for 16+c bit */
@@ -102,6 +103,7 @@
 out:
 	return result;
 }
+#endif
  
 /*
  *	This is a version of ip_compute_csum() optimized for IP headers,
...	...	@@ -37,6 +37,7 @@
37	37
38	38	#include <asm/byteorder.h>
39	39
	40	+#ifndef do_csum
40	41	static inline unsigned short from32to16(unsigned int x)
41	42	{
42	43	/* add up 16-bit and 16-bit for 16+c bit */
...	...	@@ -102,6 +103,7 @@
102	103	out:
103	104	return result;
104	105	}
	106	+#endif
105	107
106	108	/*
107	109	* This is a version of ip_compute_csum() optimized for IP headers,