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| author | Mao Han <han_mao@c-sky.com> | 2019-08-29 14:57:00 +0800 |
|---|---|---|
| committer | Paul Walmsley <paul.walmsley@sifive.com> | 2019-09-04 12:43:00 -0700 |
| commit | dbeb90b0c1eb86a9b963b929d3c937afb7dadfa3 (patch) | |
| tree | 75c68accfe0d5c2cefacd0ce511e6efdbbecd196 /arch/riscv/Makefile | |
| parent | 909548d6c5789dbd6cd4c7a6b32fcf0ae974f5ee (diff) | |
| download | lwn-dbeb90b0c1eb86a9b963b929d3c937afb7dadfa3.tar.gz lwn-dbeb90b0c1eb86a9b963b929d3c937afb7dadfa3.zip | |
riscv: Add perf callchain support
This patch add support for perf callchain sampling on riscv platforms.
The return address of leaf function is retrieved from pt_regs as
it is not saved in the outmost frame.
Signed-off-by: Mao Han <han_mao@c-sky.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: linux-riscv <linux-riscv@lists.infradead.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Guo Ren <guoren@kernel.org>
Tested-by: Greentime Hu <greentime.hu@sifive.com>
[paul.walmsley@sifive.com: fixed some 'checkpatch.pl --strict' issues;
fixed patch description spelling]
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Diffstat (limited to 'arch/riscv/Makefile')
| -rw-r--r-- | arch/riscv/Makefile | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index a73659e30f8d..4f0a3d2018d2 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -54,6 +54,9 @@ endif ifeq ($(CONFIG_MODULE_SECTIONS),y) KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/riscv/kernel/module.lds endif +ifeq ($(CONFIG_PERF_EVENTS),y) + KBUILD_CFLAGS += -fno-omit-frame-pointer +endif KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) |