On Tuesday 18 July 2006 11:56, Arjan van de Ven wrote: > On Tue, 2006-07-18 at 00:00 -0700, Chris Wright wrote: > > plain text document attachment (synch-ops) > > Add "always lock'd" implementations of set_bit, clear_bit and > > change_bit and the corresponding test_and_ functions. Also add > > "always lock'd" implementation of cmpxchg. These give guaranteed > > strong synchronisation and are required for non-SMP kernels running on > > an SMP hypervisor. > > Hi, > > this sounds really like the wrong approach; you know you're compiling > for xen, so why not just make set_bit() and the others use the lock'd > instructions at compile time? I guess because they only need it for a small subset of set_bits. -Andi
