On Mon, Nov 15, 2021 at 10:59:07AM -0800, Minchan Kim wrote: > In preparation for converting bit_spin_lock to rwlock in zsmalloc > so that multiple writers of zspages can run at the same time but > those zspages are supposed to be different zspage instance. Thus, > it's not deadlock. This patch adds write_lock_nested to support > the case for LOCKDEP. > > Cc: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> > Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx> > --- > include/linux/rwlock.h | 6 ++++++ > include/linux/rwlock_api_smp.h | 9 +++++++++ > include/linux/rwlock_rt.h | 6 ++++++ > include/linux/spinlock_api_up.h | 1 + > kernel/locking/spinlock.c | 6 ++++++ > kernel/locking/spinlock_rt.c | 12 ++++++++++++ > 6 files changed, 40 insertions(+) Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
