linux-kernel - [PATCH 1/2] ARM: zynq: support smp in thumb mode

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Date:   Mon,  5 Aug 2019 23:07:17 -0400
From:   Luis Araneda <luaraneda@...il.com>
To:     linux@...linux.org.uk, michal.simek@...inx.com
Cc:     stable@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Luis Araneda <luaraneda@...il.com>
Subject: [PATCH 1/2] ARM: zynq: support smp in thumb mode

Add .arm directive to headsmp.S to ensure that the
CPU starts in 32-bit ARM mode and the correct code
size is copied on smp bring-up

Additionally, start secondary CPUs on secondary_startup_arm
to automatically switch from ARM to thumb on a thumb kernel

Suggested-by: Michal Simek <michal.simek@...inx.com>
Signed-off-by: Luis Araneda <luaraneda@...il.com>
---
 arch/arm/mach-zynq/headsmp.S | 2 ++
 arch/arm/mach-zynq/platsmp.c | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-zynq/headsmp.S b/arch/arm/mach-zynq/headsmp.S
index ab85003cf9ad..3449e0d1f990 100644
--- a/arch/arm/mach-zynq/headsmp.S
+++ b/arch/arm/mach-zynq/headsmp.S
@@ -7,6 +7,8 @@
 #include <linux/init.h>
 #include <asm/assembler.h>
 
+	.arm
+
 ENTRY(zynq_secondary_trampoline)
 ARM_BE8(setend	be)				@ ensure we are in BE8 mode
 	ldr	r0, zynq_secondary_trampoline_jump
diff --git a/arch/arm/mach-zynq/platsmp.c b/arch/arm/mach-zynq/platsmp.c
index a7cfe07156f4..38728badabd4 100644
--- a/arch/arm/mach-zynq/platsmp.c
+++ b/arch/arm/mach-zynq/platsmp.c
@@ -81,7 +81,7 @@ EXPORT_SYMBOL(zynq_cpun_start);
 
 static int zynq_boot_secondary(unsigned int cpu, struct task_struct *idle)
 {
-	return zynq_cpun_start(__pa_symbol(secondary_startup), cpu);
+	return zynq_cpun_start(__pa_symbol(secondary_startup_arm), cpu);
 }
 
 /*
-- 
2.22.0