Oliver Neukum wrote: > Am Mittwoch, 4. Juli 2007 schrieb jidong xiao: >> I see struct rw_semaphore is defined in >> include/linux/rwsem-spinlock.h,in the meanwhile, I also can find it in > > Quote: > > #ifndef _LINUX_RWSEM_H > #error "please don't include linux/rwsem-spinlock.h directly, use > linux/rwsem.h instead" > #endif > >> include/asm-**/rwsem.h,for >> example,include/asm-i386/rwsem.h,include/asm-x86_64/rwsem.h,why?which >> one should be used? > > This structure is so important to performance that some architectures > have version optimized to their features.
...but of course we generally include linux/rwsem.h instead of architecture-specific header files. linux/rwsem.h will transparently pull in the optimized variants for us. (It's evident from the source.) -- Stefan Richter -=====-=-=== -=== --=-- http://arcgraph.de/sr/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
