[PATCH v6 09/17] arm64:ilp32 use the native LP64 'start_thread' for ILP32 threads

From: Yury Norov
Date: Mon Nov 02 2015 - 18:33:45 EST

From: Andrew Pinski <apinski@xxxxxxxxxx>

If we have both ILP32 and AARCH32 compiled in, we need use the non compat start
thread for ILP32.

Signed-off-by: Philipp Tomsich <philipp.tomsich@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Christoph Muellner <christoph.muellner@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Yury Norov <ynorov@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Pinski <Andrew.Pinski@xxxxxxxxxxxxxxxxxx>
Reviewed-by: David Daney <david.daney@xxxxxxxxxx>
arch/arm64/include/asm/processor.h | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index a415dd0..e244cb4 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -28,6 +28,7 @@
#ifdef __KERNEL__

#include <linux/string.h>
+#include <linux/thread_info.h>

#include <asm/fpsimd.h>
#include <asm/hw_breakpoint.h>
@@ -123,6 +124,15 @@ static inline void start_thread(struct pt_regs *regs, unsigned long pc,
static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc,
unsigned long sp)
+#ifdef CONFIG_ARM64_ILP32
+ /* ILP32 thread are started the same way as LP64 threads.
+ Note we cannot use is_ilp32_compat_task here as that
+ would introduce a header depency issue. */
+ if (test_thread_flag(TIF_32BIT_AARCH64)) {
+ start_thread(regs, pc, sp);
+ return;
+ }
start_thread_common(regs, pc);
regs->pstate = COMPAT_PSR_MODE_USR;
if (pc & 1)

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