[PATCH] arm: port KCOV to arm

[linux@armlinux.org.uk (Russell King - ARM Linux)]

On Thu, Apr 26, 2018 at 03:08:46PM +0200, Dmitry Vyukov wrote:
> KCOV is code coverage collection facility used, in particular, by syzkaller
> system call fuzzer. There is some interest in using syzkaller on arm devices.
> So port KCOV to arm.
> 
> On implementation level this merely declares that KCOV is supported and
> disables instrumentation of 3 special cases. Reasons for disabling are
> commented in code.
> 
> Tested with qemu-system-arm/vexpress-a15.
> 
> Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
> Cc: Russell King <linux@armlinux.org.uk>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Abbott Liu <liuwenliang@huawei.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Koguchi Takuo <takuo.koguchi.sw@hitachi.com>
> Cc: Atul Prakash <atulp@google.com>
> Cc: linux at armlinux.org.uk
> Cc: linux-arm-kernel at lists.infradead.org
> Cc: syzkaller at googlegroups.com
> ---
>  arch/arm/Kconfig                  | 1 +
>  arch/arm/boot/compressed/Makefile | 3 +++
>  arch/arm/mm/Makefile              | 4 ++++
>  arch/arm/vdso/Makefile            | 3 +++
>  4 files changed, 11 insertions(+)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index a7f8e7f4b88f..60558a6bb744 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -105,6 +105,7 @@ config ARM
>  	select REFCOUNT_FULL
>  	select RTC_LIB
>  	select SYS_SUPPORTS_APM_EMULATION
> +	select ARCH_HAS_KCOV
>  	# Above selects are sorted alphabetically; please add new ones
>  	# according to that.  Thanks.

Please read this comment and rework your patch, thanks.

-- 
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