Hi guys
In fact my problem is gettimeofday cannot return right value
sometimes, and this will bring instability to our system software. You can
find a law from the log that there is a 17592 seconds' shift every time
error occurs.2010/3/26 Csdncannon <csdncan...@gmail.com> > Yes, the missing 64-bit conversion is the key problem, I will try removing > isync later. > > Thanks for your support. > > > 2010/3/26 Segher Boessenkool <seg...@kernel.crashing.org> > >> > Yes indeed. Could you post the relevant piece if disassembly from >> >> > your original binary (the one that has the problem)? Or send me the >> > binary (not to the mailing list), I'll do it then. >> >> Ah scratch that. I compiled your original code (after fixing the >> compile errors -- there is no such type as "bool" in C). >> >> The problem is that (upper << 32) | lower thing. "upper" is a 32-bit >> type, so shifting it by 32 or more bits is undefined. GCC compiles this >> to (shortened): >> >> 0: mftbu 9 ; mftbl 11 ; mftbu 0 ; cmpw 0,9 ; bne 0b # so far so good >> slwi 0,0,0 ; or 4,0,11 ; li 3,0 ; blr >> >> so it shifts by 0, i.e. it does upper | lower . >> >> Case closed, no hardware problem :-) >> >> >> Segher >> >> >
gettime.c
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gettime.log
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