[RFC 2/4] Restartable sequences: powerpc architecture support
From: Boqun Feng <hidden>
Date: 2016-07-27 15:05:32
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
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 <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 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