Aurelien Jarno <aurel...@aurel32.net> writes: > On 2015-08-09 09:11, Alex Bennée wrote: >> >> Aurelien Jarno <aurel...@aurel32.net> writes: >> >> > On 2015-08-07 19:03, Alvise Rigo wrote: >> >> Introduce the new --enable-tcg-ldst-excl configure option to enable the >> >> LL/SC operations only for those backends that support them. >> >> >> >> Suggested-by: Jani Kokkonen <jani.kokko...@huawei.com> >> >> Suggested-by: Claudio Fontana <claudio.font...@huawei.com> >> >> Signed-off-by: Alvise Rigo <a.r...@virtualopensystems.com> >> >> --- >> >> configure | 21 +++++++++++++++++++++ >> >> 1 file changed, 21 insertions(+) >> > >> > We have seen that for this kind of patch, it's better to add support in >> > all backends, otherwise it takes ages to get all the backends converted. >> > I think you should involve the backend maintainers. I can try to provide >> > the corresponding patches for mips and ia64. >> >> We discussed this on the last MTTCG call and agree. However we will need >> help from the other TCG maintainers for the backends. The changes should >> be fairly mechanical though. >> >> However in the spirit of keeping trees building in the meantime should >> we change this from a configure option to just a static option for each >> given backend as it is converted? > > I am not even sure we need a static option. I guess providing we are > doing that early enough in the 2.5 cycle, we can just add the new ops > and start using them. Of course we should put the backends maintainers > in the loop so they can fix that quickly and don't get a surprise weeks > afters. > > That said, please see my other email, I am not sure we actually need to > modify backends, I think we can implement these new "ops" through > tcg-runtime.
We still need to ensure "normal" ld/st operations trip the exclusive bit though. > > Aurelien -- Alex Bennée
