[0/4] Cleanup instrumentation avoidance

Message ID 20171016132440.38098-1-mark.rutland@arm.com
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  • Cleanup instrumentation avoidance
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Mark Rutland Oct. 16, 2017, 1:24 p.m.
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

Comments

Mark Rutland Oct. 16, 2017, 1:35 p.m. | #1
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

>