----- On Jul 27, 2016, at 11:05 AM, Boqun Feng boqun.f...@gmail.com wrote: > Call the rseq_handle_notify_resume() function on return to userspace if > TIF_NOTIFY_RESUME thread flag is set. > > Increment the event counter and perform fixup on the pre-signal when a > signal is delivered on top of a restartable sequence critical section.
Picked into my patchset. I'm keeping a volatile branch of my current work at https://github.com/compudj/linux-percpu-dev/tree/rseq-fallback if you are interested in the progress. Thanks! Mathieu > > Signed-off-by: Boqun Feng <boqun.f...@gmail.com> > --- > arch/powerpc/Kconfig | 1 + > arch/powerpc/kernel/signal.c | 3 +++ > 2 files changed, 4 insertions(+) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 0a9d439bcda6..4e93629c6b84 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -120,6 +120,7 @@ config PPC > select HAVE_PERF_USER_STACK_DUMP > select HAVE_REGS_AND_STACK_ACCESS_API > select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64 > + select HAVE_RSEQ > select ARCH_WANT_IPC_PARSE_VERSION > select SPARSE_IRQ > select IRQ_DOMAIN > diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c > index cb64d6feb45a..339d0ebe2906 100644 > --- a/arch/powerpc/kernel/signal.c > +++ b/arch/powerpc/kernel/signal.c > @@ -131,6 +131,8 @@ static void do_signal(struct pt_regs *regs) > /* Re-enable the breakpoints for the signal stack */ > thread_change_pc(current, regs); > > + rseq_signal_deliver(regs); > + > if (is32) { > if (ksig.ka.sa.sa_flags & SA_SIGINFO) > ret = handle_rt_signal32(&ksig, oldset, regs); > @@ -157,6 +159,7 @@ void do_notify_resume(struct pt_regs *regs, unsigned long > thread_info_flags) > if (thread_info_flags & _TIF_NOTIFY_RESUME) { > clear_thread_flag(TIF_NOTIFY_RESUME); > tracehook_notify_resume(regs); > + rseq_handle_notify_resume(regs); > } > > user_enter(); > -- > 2.9.0 -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
