arm64: Silence gcc warnings about arch ABI drift

[ Upstream commit ebcc5928c5d925b1c8d968d9c89cdb0d0186db17 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[sw0312.kim: cherry-pick from stable linux-4.19.y commit 71d019a6dae9 for gcc 9 build]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Change-Id: I6a6ca56261860468207555d869f5a90882565c4b

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 853e565f89576b8dec9d92f78711f19cf7abb8e4..3a9c9a0e1e1081dd6520ed78870fc43d454d1076 100644 (file)
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -51,6 +51,7 @@ endif
 
 KBUILD_CFLAGS  += -mgeneral-regs-only $(lseinstr) $(brokengasinst)
 KBUILD_CFLAGS  += -fno-asynchronous-unwind-tables
+KBUILD_CFLAGS  += -Wno-psabi
 KBUILD_AFLAGS  += $(lseinstr) $(brokengasinst)
 
 KBUILD_CFLAGS  += $(call cc-option,-mabi=lp64)