From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mathieu Desnoyers Subject: [RFC PATCH v8 7/9] Restartable sequences: powerpc architecture support Date: Fri, 19 Aug 2016 16:07:52 -0400 Message-ID: <1471637274-13583-8-git-send-email-mathieu.desnoyers@efficios.com> References: <1471637274-13583-1-git-send-email-mathieu.desnoyers@efficios.com> Return-path: In-Reply-To: <1471637274-13583-1-git-send-email-mathieu.desnoyers@efficios.com> Sender: linux-kernel-owner@vger.kernel.org To: Peter Zijlstra , "Paul E. McKenney" , Boqun Feng , Andy Lutomirski , Dave Watson Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, Paul Turner , Andrew Morton , Russell King , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Andrew Hunter , Andi Kleen , Chris Lameter , Ben Maurer , Steven Rostedt , Josh Triplett , Linus Torvalds , Catalin Marinas , Will Deacon , Michael Kerrisk , Mathieu Desnoyers List-Id: linux-api@vger.kernel.org From: Boqun Feng 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 Signed-off-by: Mathieu Desnoyers --- 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 927d2ab..4847a8a 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -119,6 +119,7 @@ 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 cb64d6f..339d0eb 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(); -- 2.1.4