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SubjectRe: [PATCH v2] riscv: Allow building with kcov coverage
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On Fri, 26 Jun 2020 05:40:56 PDT (-0700), tklauser@distanz.ch wrote:
> Add ARCH_HAS_KCOV and HAVE_GCC_PLUGINS to the riscv Kconfig.
> Also disable instrumentation of some early boot code and vdso.
>
> Boot-tested on QEMU's riscv64 virt machine.

Thanks. This is on for-next (with the ack). I'm boot testing a config with

CONFIG_KCOV=y
CONFIG_KCOV_ENABLE_COMPARISONS=y

but LMK if there's something more interesting to test. I don't see anything
coverage-related in the boot log...

> Cc: Björn Töpel <bjorn.topel@gmail.com>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
> ---
> arch/riscv/Kconfig | 2 ++
> arch/riscv/boot/Makefile | 2 ++
> arch/riscv/kernel/vdso/Makefile | 1 +
> arch/riscv/mm/Makefile | 2 ++
> 4 files changed, 7 insertions(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 089293e4ad46..a7d7f8184f15 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -19,6 +19,7 @@ config RISCV
> select ARCH_HAS_DEBUG_WX
> select ARCH_HAS_GCOV_PROFILE_ALL
> select ARCH_HAS_GIGANTIC_PAGE
> + select ARCH_HAS_KCOV
> select ARCH_HAS_MMIOWB
> select ARCH_HAS_PTE_SPECIAL
> select ARCH_HAS_SET_DIRECT_MAP
> @@ -57,6 +58,7 @@ config RISCV
> select HAVE_DMA_CONTIGUOUS if MMU
> select HAVE_EBPF_JIT if MMU
> select HAVE_FUTEX_CMPXCHG if FUTEX
> + select HAVE_GCC_PLUGINS
> select HAVE_GENERIC_VDSO if MMU && 64BIT
> select HAVE_PCI
> select HAVE_PERF_EVENTS
> diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile
> index 3530c59b3ea7..c59fca695f9d 100644
> --- a/arch/riscv/boot/Makefile
> +++ b/arch/riscv/boot/Makefile
> @@ -14,6 +14,8 @@
> # Based on the ia64 and arm64 boot/Makefile.
> #
>
> +KCOV_INSTRUMENT := n
> +
> OBJCOPYFLAGS_Image :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
>
> targets := Image loader
> diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
> index 29cf052f6541..4b0d3bcc44e5 100644
> --- a/arch/riscv/kernel/vdso/Makefile
> +++ b/arch/riscv/kernel/vdso/Makefile
> @@ -29,6 +29,7 @@ CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
>
> # Disable gcov profiling for VDSO code
> GCOV_PROFILE := n
> +KCOV_INSTRUMENT := n
>
> # Force dependency
> $(obj)/vdso.o: $(obj)/vdso.so
> diff --git a/arch/riscv/mm/Makefile b/arch/riscv/mm/Makefile
> index 363ef01c30b1..c0185e556ca5 100644
> --- a/arch/riscv/mm/Makefile
> +++ b/arch/riscv/mm/Makefile
> @@ -5,6 +5,8 @@ ifdef CONFIG_FTRACE
> CFLAGS_REMOVE_init.o = -pg
> endif
>
> +KCOV_INSTRUMENT_init.o := n
> +
> obj-y += init.o
> obj-y += extable.o
> obj-$(CONFIG_MMU) += fault.o pageattr.o

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