linux-kernel - Re: [PATCH 0/4] Cleanup instrumentation avoidance

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Message-ID: <20171016133530.fhspouznccpprjc6@lakrids.cambridge.arm.com>
Date:   Mon, 16 Oct 2017 14:35:31 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     linux-arm-kernel@...ts.infradead.org, marc.zyngier@....com
Cc:     linux-kernel@...r.kernel.org, adech.fo@...il.com,
        aryabinin@...tuozzo.com, catalin.marinas@....com,
        christoffer.dall@...aro.org, dvyukov@...gle.com,
        linux-kbuild@...r.kernel.org, will.deacon@....com,
        yamada.masahiro@...ionext.com
Subject: Re: [PATCH 0/4] Cleanup instrumentation avoidance

Sorry Marc, I somehow typo'd your name when sending this out...

Mark.

On Mon, Oct 16, 2017 at 02:24:36PM +0100, Mark Rutland wrote:
> Recently we spotted that some code with special ABI requirements was
> being instrumented by KCOV [1], and we need to avoid all instrumentation
> in this case.
> 
> While it's possible to disable each instrumentation option manually,
> this is tedious and error prone as new options are introduced.
> 
> This series adds a new CC_INSTRUMENT option which can be used to disable
> all instrumentation of a given file or directory, and makes use of this
> throught arm64.
> 
> There are other places where this could be used (e.g. the EFI stub), but
> I've avoided altering those for now in the hope that this can be taken
> via the arm64 tree.
> 
> Thanks,
> Mark.
> 
> [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-September/533105.html
> 
> Mark Rutland (4):
>   kbuild: allow global override of CC instrumentation
>   arm64: prevent instrumentation of LL/SC atomics
>   kvm/arm64: simplify CC instrumentation opt-out
>   arm64: vdso: remove pointless gcov option
> 
>  arch/arm64/kernel/vdso/Makefile |  3 ---
>  arch/arm64/kvm/hyp/Makefile     |  5 +----
>  arch/arm64/lib/Makefile         |  1 +
>  scripts/Makefile.lib            | 17 +++++++++++++----
>  4 files changed, 15 insertions(+), 11 deletions(-)
> 
> -- 
> 2.11.0
>