From 7bf5234db7cce45fa9ff237ce0f45da2bd277cad Mon Sep 17 00:00:00 2001 From: Max Filippov Date: Fri, 28 Apr 2017 09:40:00 -0700 Subject: xtensa: add -mno-serialize-volatile to CFLAGS By default xtensa gcc inserts memw for all volatile object accesses. This is too pessimistic for the kernel: there should be no "normal" volatile objects, and all special objects, like MMIO or objects shared between CPUs should have explicit barriers. Signed-off-by: Max Filippov --- arch/xtensa/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/xtensa/Makefile b/arch/xtensa/Makefile index 7ee02fe4a63d..a206598b5d95 100644 --- a/arch/xtensa/Makefile +++ b/arch/xtensa/Makefile @@ -46,6 +46,7 @@ KBUILD_CFLAGS += -ffreestanding -D__linux__ KBUILD_CFLAGS += -pipe -mlongcalls KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,) +KBUILD_CFLAGS += $(call cc-option,-mno-serialize-volatile,) ifneq ($(CONFIG_LD_NO_RELAX),) LDFLAGS := --no-relax -- cgit v1.2.3-59-g8ed1b