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Commit 7bf5234d authored by Max Filippov's avatar Max Filippov
Browse files

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: default avatarMax Filippov <jcmvbkbc@gmail.com>
parent bebc6082

arch/xtensa/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -46,6 +46,7 @@ KBUILD_CFLAGS += -ffreestanding -D__linux__ 
KBUILD_CFLAGS += -pipe -mlongcalls

KBUILD_CFLAGS += -pipe -mlongcalls





KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,)

KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,)

KBUILD_CFLAGS += $(call cc-option,-mno-serialize-volatile,)





ifneq ($(CONFIG_LD_NO_RELAX),)

ifneq ($(CONFIG_LD_NO_RELAX),)

LDFLAGS := --no-relax

LDFLAGS := --no-relax