From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boqun Feng Subject: [RFC 2/4] Restartable sequences: powerpc architecture support Date: Wed, 27 Jul 2016 23:05:15 +0800 Message-ID: <20160727150517.26983-2-boqun.feng@gmail.com> References: <20160727150352.GA32142@tardis.cn.ibm.com> <20160727150517.26983-1-boqun.feng@gmail.com> Return-path: In-Reply-To: <20160727150517.26983-1-boqun.feng@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org Cc: Mathieu Desnoyers , Andrew Morton , Russell King , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Paul Turner , Andrew Hunter , Peter Zijlstra , Andy Lutomirski , Andi Kleen , Dave Watson , Chris Lameter , Ben Maurer , Steven Rostedt , "Paul E. McKenney" , Josh Triplett , Linus Torvalds , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Boqun Feng List-Id: linux-api@vger.kernel.org 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. Signed-off-by: Boqun Feng --- 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