On Fri, 28 Sep 2018, Martin Schwidefsky wrote: > On Fri, 28 Sep 2018 09:12:10 +0200 > Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote: > > I don't know if that has happened, and whether it would work on s390 now. > > commit 03b8c7b623c80af264c4c8d6111e5c6289933666 > Author: Heiko Carstens <heiko.carstens@xxxxxxxxxx> > Date: Sun Mar 2 13:09:47 2014 +0100 > > futex: Allow architectures to skip futex_atomic_cmpxchg_inatomic() test > > If an architecture has futex_atomic_cmpxchg_inatomic() implemented and there > is no runtime check necessary, allow to skip the test within futex_init(). > > This allows to get rid of some code which would always give the same result, > and also allows the compiler to optimize a couple of if statements away. > > Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx> > Cc: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx> > Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> > Link: http://lkml.kernel.org/r/20140302120947.GA3641@osiris > Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > > > Heiko created the CONFIG_HAVE_FUTEX_CMPXCHG to get around this issue. > We just skip the runtime check as well as arc, m68k and sh. Not sure > about xtensa, the set it config option only for !MMU. Duh. grep would have told me. -ENOTENOUGHCOFFEE Thanks, tglx
