Subject: powerpc/stackprotector: work around stack-guard init from atomic
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue Mar 26 18:31:29 2019 +0100

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

This is invoked from the secondary CPU in atomic context. On x86 we use
tsc instead. On Power we XOR it against mftb() so lets use stack address
as the initial value.

Cc: stable-rt@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>


---
 arch/powerpc/include/asm/stackprotector.h |    4 ++++
 1 file changed, 4 insertions(+)
---
--- a/arch/powerpc/include/asm/stackprotector.h
+++ b/arch/powerpc/include/asm/stackprotector.h
@@ -24,7 +24,11 @@ static __always_inline void boot_init_st
 	unsigned long canary;
 
 	/* Try to get a semi random initial value. */
+#ifdef CONFIG_PREEMPT_RT
+	canary = (unsigned long)&canary;
+#else
 	canary = get_random_canary();
+#endif
 	canary ^= mftb();
 	canary ^= LINUX_VERSION_CODE;
 	canary &= CANARY_MASK;