From: Luis Araneda <luaraneda@gmail.com>
To: linux@armlinux.org.uk, michal.simek@xilinx.com
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Luis Araneda <luaraneda@gmail.com>
Subject: [PATCH v2 1/2] ARM: zynq: support smp in thumb mode
Date: Thu, 8 Aug 2019 08:52:42 -0400 [thread overview]
Message-ID: <20190808125243.31046-2-luaraneda@gmail.com> (raw)
In-Reply-To: <20190808125243.31046-1-luaraneda@gmail.com>
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.
This is related to the fix applied to SoCFPGA by
commit 5616f36713ea
("ARM: SoCFPGA: Fix secondary CPU startup in thumb2 kernel")
Additionally, start secondary CPUs on secondary_startup_arm
to automatically switch from ARM to thumb on a thumb kernel
Signed-off-by: Luis Araneda <luaraneda@gmail.com>
Suggested-by: Michal Simek <michal.simek@xilinx.com>
---
Changes:
v1 -> v2:
- Reword commit message to include related commits
---
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
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next prev parent reply other threads:[~2019-08-08 12:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-08 12:52 [PATCH v2 0/2] ARM: zynq: smp improvements Luis Araneda
2019-08-08 12:52 ` Luis Araneda [this message]
2019-08-08 12:52 ` [PATCH v2 2/2] ARM: zynq: Use memcpy_toio instead of memcpy on smp bring-up Luis Araneda
2019-08-14 7:40 ` [PATCH v2 0/2] ARM: zynq: smp improvements Michal Simek
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