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-rw-r--r--arch/arm/include/asm/checksum.h34
1 files changed, 24 insertions, 10 deletions
diff --git a/arch/arm/include/asm/checksum.h b/arch/arm/include/asm/checksum.h
index 6dcc16430868..523315115478 100644
--- a/arch/arm/include/asm/checksum.h
+++ b/arch/arm/include/asm/checksum.h
@@ -87,19 +87,33 @@ static inline __wsum
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
unsigned short proto, __wsum sum)
{
- __asm__(
- "adds %0, %1, %2 @ csum_tcpudp_nofold \n\
- adcs %0, %0, %3 \n"
+ u32 lenprot = len | proto << 16;
+ if (__builtin_constant_p(sum) && sum == 0) {
+ __asm__(
+ "adds %0, %1, %2 @ csum_tcpudp_nofold0 \n\t"
#ifdef __ARMEB__
- "adcs %0, %0, %4 \n"
+ "adcs %0, %0, %3 \n\t"
#else
- "adcs %0, %0, %4, lsl #8 \n"
+ "adcs %0, %0, %3, ror #8 \n\t"
#endif
- "adcs %0, %0, %5 \n\
- adc %0, %0, #0"
- : "=&r"(sum)
- : "r" (sum), "r" (daddr), "r" (saddr), "r" (len), "Ir" (htons(proto))
- : "cc");
+ "adc %0, %0, #0"
+ : "=&r" (sum)
+ : "r" (daddr), "r" (saddr), "r" (lenprot)
+ : "cc");
+ } else {
+ __asm__(
+ "adds %0, %1, %2 @ csum_tcpudp_nofold \n\t"
+ "adcs %0, %0, %3 \n\t"
+#ifdef __ARMEB__
+ "adcs %0, %0, %4 \n\t"
+#else
+ "adcs %0, %0, %4, ror #8 \n\t"
+#endif
+ "adc %0, %0, #0"
+ : "=&r"(sum)
+ : "r" (sum), "r" (daddr), "r" (saddr), "r" (lenprot)
+ : "cc");
+ }
return sum;
}
/*