MIPS: checksum: fix sparse flooding on asm/checksum.h

csum_fold() in MIPS' asm/checksum.h is another source of sparse flooding
when building different networking source code.
The thing is that only half of __wsum <--> u32 casts inside the function
is forced, which is insufficient.
Add all necessary forced typecasting to stop floods and simplify actual
bug hunting.

Signed-off-by: Alexander Lobakin <alobakin@pm.me>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

diff --git a/arch/mips/include/asm/checksum.h b/arch/mips/include/asm/checksum.h
index dcebaaf..181f7d1 100644 (file)
--- a/arch/mips/include/asm/checksum.h
+++ b/arch/mips/include/asm/checksum.h
@@ -113,9 +113,9 @@ static inline __sum16 csum_fold(__wsum csum)
        u32 sum = (__force u32)csum;
 
        sum += (sum << 16);
-       csum = (sum < csum);
+       csum = (__force __wsum)(sum < (__force u32)csum);
        sum >>= 16;
-       sum += csum;
+       sum += (__force u32)csum;
 
        return (__force __sum16)~sum;
 }