Thanks, I got bit confuse with below statement: This is from paper Memory access ordering Part 2 SMP conditional barriers The SMP conditional barriers are used to ensure a consistent view of memory between different cores within a cache coherent SMP system. When compiling a kernel without CONFIG_SMP, all SMP barriers are converted into plain compiler barriers. 2011/12/9 卜弋天 <buyit@xxxxxxx>: > Hi : > > memory barriers can not make order on other cpus, only the current > cpu's order will be promised. > > > >> Date: Fri, 9 Dec 2011 12:54:40 +0530 >> Subject: Memory barrier >> From: trisha1march@xxxxxxxxx >> To: Kernelnewbies@xxxxxxxxxxxxxxxxx > >> >> Hi All, >> >> I need small clarification on memory barrier. >> #define smp_mb() mb() >> #define smp_rmb() rmb() >> #define smp_wmb() wmb() >> In case of SMP: >> is smp_mb() or smp_rmb() make order on current CPU or all cpu's >> >> Thanks >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies@xxxxxxxxxxxxxxxxx >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
