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| author | Max Filippov | 2017-04-28 18:40:00 +0200 |
|---|---|---|
| committer | Max Filippov | 2017-12-10 08:55:56 +0100 |
| commit | 7bf5234db7cce45fa9ff237ce0f45da2bd277cad (patch) | |
| tree | 2b376172285d3d145e3c5ace2ed2307da276dae9 /arch/xtensa/Makefile | |
| parent | Linux 4.14 (diff) | |
| download | kernel-qcow2-linux-7bf5234db7cce45fa9ff237ce0f45da2bd277cad.tar.gz kernel-qcow2-linux-7bf5234db7cce45fa9ff237ce0f45da2bd277cad.tar.xz kernel-qcow2-linux-7bf5234db7cce45fa9ff237ce0f45da2bd277cad.zip | |
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 <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/Makefile')
| -rw-r--r-- | arch/xtensa/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
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 |