On Wed, Feb 13, 2019 at 11:01 PM Waiman Long <longman@xxxxxxxxxx> wrote: > Currently, we have two different implementation of rwsem: > 1) CONFIG_RWSEM_GENERIC_SPINLOCK (rwsem-spinlock.c) > 2) CONFIG_RWSEM_XCHGADD_ALGORITHM (rwsem-xadd.c) > > As we are going to use a single generic implementation for rwsem-xadd.c > and no architecture-specific code will be needed, there is no point > in keeping two different implementations of rwsem. In most cases, the > performance of rwsem-spinlock.c will be worse. It also doesn't get all > the performance tuning and optimizations that had been implemented in > rwsem-xadd.c over the years. > > For simplication, we are going to remove rwsem-spinlock.c and make all > architectures use a single implementation of rwsem - rwsem-xadd.c. > > All references to RWSEM_GENERIC_SPINLOCK and RWSEM_XCHGADD_ALGORITHM > in the code are removed. > > Suggested-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Signed-off-by: Waiman Long <longman@xxxxxxxxxx> Note that this conflicts with "[PATCH 03/11] kernel/locks: consolidate RWSEM_GENERIC_* options" https://lore.kernel.org/lkml/20190213174005.28785-4-hch@xxxxxx/ Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
