[PATCH 2/3] ARM: aarch64: compile with general-regs-only

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Without this flag, gcc generates code to save the Q/V registers to the
stack for handling the va_list in pr_print(). Saving the registers is
use useless, as the registers are never restored, but this hangs the
CPU.

Follow the Linux arch/arm64/Makefile and the general-regs-only flag, to
prevent usage of floating point and Advanced SIMD register.

Signed-off-by: Michael Tretter <m.tretter@xxxxxxxxxxxxxx>
---
 arch/arm/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 5db67b9db8..50958b787f 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -27,6 +27,10 @@ else
 CFLAGS += -mstrict-align
 endif
 
+# Prevent use of floating point and Advanced SIMD registers.
+ifeq ($(CONFIG_CPU_V8),y)
+CFLAGS += -mgeneral-regs-only
+endif
 
 # This selects which instruction set is used.
 # Note that GCC does not numerically define an architecture version
-- 
2.19.1


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