Hello Folks, I am working on inline asm related staff. I couldn't get proper answer for this question. So posting this question here..... Expecting good response from you. * Should we use "memory" clobber in *every* inline asm which does atomic operation? (In MIPS, 'll'/'sc' instructions are used to provide atomic operation) As per my understanding, "memory" clobber will be required for inline asm only if the corresponding functions can be used to implement *lock* and *unlock* primitives (or) memory modified by the inline asm is *unknown*. Please correct me if I am wrong. In the following URL, "memory" clobber has been specified in the functions 'atomic_add_return' and 'atomic_sub_return'. But it is *not* specified in the functions 'atomic_add' and 'atomic_sub'. WHY? http://lxr.linux.no/source/include/asm-mips/atomic.h?v=2.6.5 Does it mean that 'atomic_add'/'atomic_sub' (which returns 'void') can't be used to implement *lock* and *unlock* primitives? Please clarify it. Thanks in advance! Expecting your responses ... -AshokA __________________________________ Do you Yahoo!? Friends. Fun. Try the all-new Yahoo! Messenger. http://messenger.yahoo.com/
