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xtensa: add -mno-serialize-volatile to CFLAGS

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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 <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov
2017-04-28 09:40:00 -07:00
parent bebc6082da
commit 7bf5234db7
1 changed files with 1 additions and 0 deletions
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arch/xtensa/Makefile
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@@ -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