On Fri, Jul 06, 2018 at 02:03:23PM +0200, Peter Zijlstra wrote: > > > Test-and-set with MB acting as ACQUIRE, ok. > > Em ... Ok, I'll try to use test-and-set function instead of it. > > "test-and-set" is just the name of this type of spinlock implementation. > > You _could_ use the linux test_and_set bitop, but those are defined on > unsigned long and spinlock_t is generally assumed to be of unsigned int > size. > > Go with the ticket locks as per below. Ok, I'll learn it.
> > Ok, I'll try to implement ticket lock in next version patch. > > If you need inspiration, look at: > arch/arm/include/asm/spinlock.h > > Or look at the current version of that file and ignore the LSE version. > > Note that unlock is a store half-word (u16), not having seen your arch > manual yet I don't know if you even have that. Nice tips, thank you very much. Guo Ren
