Identical, except that 32bit version uses asm volatile where 64bit
one uses plain asm. The former had become pointless when memory
clobber got added to both versions...
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/checksum.h | 43 ++++++++++++++++++++++++++++++
arch/x86/include/asm/checksum_32.h | 37 -------------------------
arch/x86/include/asm/checksum_64.h | 43 ------------------------------
3 files changed, 43 insertions(+), 80 deletions(-)
diff --git a/arch/x86/include/asm/checksum.h b/arch/x86/include/asm/checksum.h
index eaa5dda09bee..5e617a380537 100644
--- a/arch/x86/include/asm/checksum.h
+++ b/arch/x86/include/asm/checksum.h
@@ -26,6 +26,49 @@ static inline __sum16 csum_fold(__wsum sum)
return (__force __sum16)(~(__force u32)sum >> 16);
}
+/*
+ * This is a version of ip_compute_csum() optimized for IP headers,
+ * which always checksum on 4 octet boundaries.
+ *
+ * By Jorge Cwik <jorge@xxxxxxxxxxxxxxxxx>, adapted for linux by
+ * Arnt Gulbrandsen.
+ */
+
+/**
+ * ip_fast_csum - Compute the IPv4 header checksum efficiently.
+ * iph: ipv4 header
+ * ihl: length of header / 4
+ */
+static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
+{
+ unsigned int sum;
+
+ asm(" movl (%1), %0\n"
+ " subl $4, %2\n"
+ " jbe 2f\n"
+ " addl 4(%1), %0\n"
+ " adcl 8(%1), %0\n"
+ " adcl 12(%1), %0\n"
+ "1: adcl 16(%1), %0\n"
+ " lea 4(%1), %1\n"
+ " decl %2\n"
+ " jne 1b\n"
+ " adcl $0, %0\n"
+ " movl %0, %2\n"
+ " shrl $16, %0\n"
+ " addw %w2, %w0\n"
+ " adcl $0, %0\n"
+ " notl %0\n"
+ "2:"
+ /* Since the input registers which are loaded with iph and ihl
+ are modified, we must also specify them as outputs, or gcc
+ will assume they contain their original values. */
+ : "=r" (sum), "=r" (iph), "=r" (ihl)
+ : "1" (iph), "2" (ihl)
+ : "memory");
+ return (__force __sum16)sum;
+}
+
# ifdef CONFIG_X86_32
# include <asm/checksum_32.h>
# else
diff --git a/arch/x86/include/asm/checksum_32.h b/arch/x86/include/asm/checksum_32.h
index 4e96d0473f88..d920e6c335bc 100644
--- a/arch/x86/include/asm/checksum_32.h
+++ b/arch/x86/include/asm/checksum_32.h
@@ -55,43 +55,6 @@ static inline __wsum_fault csum_and_copy_from_user(const void __user *src,
return ret;
}
-/*
- * This is a version of ip_compute_csum() optimized for IP headers,
- * which always checksum on 4 octet boundaries.
- *
- * By Jorge Cwik <jorge@xxxxxxxxxxxxxxxxx>, adapted for linux by
- * Arnt Gulbrandsen.
- */
-static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
-{
- unsigned int sum;
-
- asm volatile("movl (%1), %0 ;\n"
- "subl $4, %2 ;\n"
- "jbe 2f ;\n"
- "addl 4(%1), %0 ;\n"
- "adcl 8(%1), %0 ;\n"
- "adcl 12(%1), %0;\n"
- "1: adcl 16(%1), %0 ;\n"
- "lea 4(%1), %1 ;\n"
- "decl %2 ;\n"
- "jne 1b ;\n"
- "adcl $0, %0 ;\n"
- "movl %0, %2 ;\n"
- "shrl $16, %0 ;\n"
- "addw %w2, %w0 ;\n"
- "adcl $0, %0 ;\n"
- "notl %0 ;\n"
- "2: ;\n"
- /* Since the input registers which are loaded with iph and ihl
- are modified, we must also specify them as outputs, or gcc
- will assume they contain their original values. */
- : "=r" (sum), "=r" (iph), "=r" (ihl)
- : "1" (iph), "2" (ihl)
- : "memory");
- return (__force __sum16)sum;
-}
-
static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
__u32 len, __u8 proto,
__wsum sum)
diff --git a/arch/x86/include/asm/checksum_64.h b/arch/x86/include/asm/checksum_64.h
index d261b4124ca6..b80c82590d8d 100644
--- a/arch/x86/include/asm/checksum_64.h
+++ b/arch/x86/include/asm/checksum_64.h
@@ -11,49 +11,6 @@
#include <linux/compiler.h>
#include <asm/byteorder.h>
-/*
- * This is a version of ip_compute_csum() optimized for IP headers,
- * which always checksum on 4 octet boundaries.
- *
- * By Jorge Cwik <jorge@xxxxxxxxxxxxxxxxx>, adapted for linux by
- * Arnt Gulbrandsen.
- */
-
-/**
- * ip_fast_csum - Compute the IPv4 header checksum efficiently.
- * iph: ipv4 header
- * ihl: length of header / 4
- */
-static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
-{
- unsigned int sum;
-
- asm(" movl (%1), %0\n"
- " subl $4, %2\n"
- " jbe 2f\n"
- " addl 4(%1), %0\n"
- " adcl 8(%1), %0\n"
- " adcl 12(%1), %0\n"
- "1: adcl 16(%1), %0\n"
- " lea 4(%1), %1\n"
- " decl %2\n"
- " jne 1b\n"
- " adcl $0, %0\n"
- " movl %0, %2\n"
- " shrl $16, %0\n"
- " addw %w2, %w0\n"
- " adcl $0, %0\n"
- " notl %0\n"
- "2:"
- /* Since the input registers which are loaded with iph and ihl
- are modified, we must also specify them as outputs, or gcc
- will assume they contain their original values. */
- : "=r" (sum), "=r" (iph), "=r" (ihl)
- : "1" (iph), "2" (ihl)
- : "memory");
- return (__force __sum16)sum;
-}
-
/**
* csum_tcpup_nofold - Compute an IPv4 pseudo header checksum.
* @saddr: source address
--
2.39.2
