From: Philippe Gerum <rpm@xenomai.org>
Date: Fri, 29 Dec 2017 04:19:42 +0000 (-0800)
Subject: ARM64: ipipe: hard protect against preemption by head domain
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d84f7fe205c76162f19eaf53e5f8a95e9847e6ac;p=platform%2Fkernel%2Flinux-exynos.git

ARM64: ipipe: hard protect against preemption by head domain
---

diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
index 0bdc96c61bc0..eaab6a4a3cf5 100644
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -744,12 +744,17 @@ static void do_signal(struct pt_regs *regs)
 asmlinkage void do_notify_resume(struct pt_regs *regs,
 				 unsigned int thread_flags)
 {
+#ifdef CONFIG_IPIPE
+	local_irq_disable();
+	hard_local_irq_enable();
+#else
 	/*
 	 * The assembly code enters us with IRQs off, but it hasn't
 	 * informed the tracing code of that for efficiency reasons.
 	 * Update the trace code with the current status.
 	 */
 	trace_hardirqs_off();
+#endif
 
 	do {
 		/* Check valid user FS if needed */
@@ -778,4 +783,9 @@ asmlinkage void do_notify_resume(struct pt_regs *regs,
 		local_irq_disable();
 		thread_flags = READ_ONCE(current_thread_info()->flags);
 	} while (thread_flags & _TIF_WORK_MASK);
+
+#ifdef CONFIG_IPIPE
+	local_irq_enable();
+	hard_local_irq_disable();
+#endif
 }