Re: [PATCH 0/4] Cleanup instrumentation avoidance

[Mark Rutland]

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
>