[PATCH v4 14/24] arm64:ilp32 use the native LP64 'start_thread' for ILP32 threads

[Philipp Tomsich]

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>
---
 arch/arm64/include/asm/processor.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index ea80e86..29ca21a 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -106,6 +106,15 @@ 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;
+	}
+#endif
 	start_thread_common(regs, pc);
 	regs->pstate = COMPAT_PSR_MODE_USR;
 	if (pc & 1)
-- 
1.9.1

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