Hi James, thanks for your comment. > > In IA-32 or x86_64, can anybady implement atomic_inc_return()? > > If it can not, I'll try to make alternative macros or inline functions. > > If you can get this done, it will be very useful, as I could allso run > some benchmarks on my test systems. atomic_inc_return() is not defined for arm,arm26,i386,x86_64 and um archtectures. This attached patch adds atomic_inc_return() and atomic_dec_return() to arm,i386 and x86_64. It is implemented by 'xaddl' operation with LOCK prefix for i386 and x86_64. But this operation is permitted after i486 processor only. Another implementation may be necessary for i386SX/DX processor. But 'xaddl' operation is used in 'include/asm-i386/rwsem.h' unconditionally. I think it has agreed on using 'xaddl' operation in past days. Is it acceptable? Any comment please. (*) The implementation for ARM is simple wrapper to atomic_add_return(). -------- Kai Gai