Re: [RFC 2/4] Restartable sequences: powerpc architecture support
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: 2016-07-28 03:13:20
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----- On Jul 27, 2016, at 11:05 AM, Boqun Feng boqun.feng@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
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Signed-off-by: Boqun Feng <redacted> --- 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 PPCselect 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_DOMAINdiff --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 longthread_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