arm64: Silence gcc warnings about arch ABI drift

Since GCC 9, the compiler warns about evolution of the
platform-specific ABI, in particular relating for the marshaling of
certain structures involving bitfields.

The kernel is a standalone binary, and of course nobody would be
so stupid as to expose structs containing bitfields as function
arguments in ABI.  (Passing a pointer to such a struct, however
inadvisable, should be unaffected by this change.  perf and various
drivers rely on that.)

So these warnings do more harm than good: turn them off.

We may miss warnings about future ABI drift, but that's too bad.
Future ABI breaks of this class will have to be debugged and fixed
the traditional way unless the compiler evolves finer-grained
diagnostics.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
[sw0312.kim: backport mainline commit ebcc5928c5d9 for gcc 9 build]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Change-Id: I2ef030a3eb5aa37486d642161588f48fb69875f5

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index fb4ac87fc3985ed49de5f62e212b26e2bb13cea7..e742564e461a6a81dfe8548f7b1cbddd8305713c 100644 (file)
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -28,6 +28,7 @@ endif
 
 KBUILD_CFLAGS  += -mgeneral-regs-only $(lseinstr)
 KBUILD_CFLAGS  += $(call cc-option, -mpc-relative-literal-loads)
+KBUILD_CFLAGS  += -Wno-psabi
 KBUILD_AFLAGS  += $(lseinstr)
 
 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)