linux-kernel - [PATCH 3.19.y-ckt 31/54] ARM: SoCFPGA: Fix secondary CPU startup in thumb2 kernel

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Message-Id: <1462838713-31343-32-git-send-email-kamal@canonical.com>
Date:	Mon,  9 May 2016 17:04:50 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sascha Hauer <s.hauer@...gutronix.de>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	Kevin Hilman <khilman@...libre.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 31/54] ARM: SoCFPGA: Fix secondary CPU startup in thumb2 kernel

3.19.8-ckt21 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Sascha Hauer <s.hauer@...gutronix.de>

commit 5616f36713ea77f57ae908bf2fef641364403c9f upstream.

The secondary CPU starts up in ARM mode. When the kernel is compiled in
thumb2 mode we have to explicitly compile the secondary startup
trampoline in ARM mode, otherwise the CPU will go to Nirvana.

Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
Reported-by: Steffen Trumtrar <s.trumtrar@...gutronix.de>
Suggested-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Signed-off-by: Dinh Nguyen <dinguyen@...nsource.altera.com>
Signed-off-by: Kevin Hilman <khilman@...libre.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/arm/mach-socfpga/headsmp.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-socfpga/headsmp.S b/arch/arm/mach-socfpga/headsmp.S
index f65ea0a..a2b1c4a 100644
--- a/arch/arm/mach-socfpga/headsmp.S
+++ b/arch/arm/mach-socfpga/headsmp.S
@@ -12,6 +12,7 @@
 #include <asm/memory.h>
 
 	.arch	armv7-a
+	.arm
 
 ENTRY(secondary_trampoline)
 	/* CPU1 will always fetch from 0x0 when it is brought out of reset.
-- 
2.7.4