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Re: Any future plan supporting livepatching in kernel for AArch64?


On Wed, Sep 18, 2019 at 9:56 PM Andrew Pinski <pinskia@gmail.com> wrote:
>
> On Wed, Sep 18, 2019 at 9:24 PM Bin.Cheng <amker.cheng@gmail.com> wrote:
> >
> > Hi,
> > I read through previous messages which tried to support livepatching
> > in kernel for AArch64.
> > Following is the patch supporting mfentry:
> > https://gcc.gnu.org/ml/gcc-patches/2016-03/msg00756.html
> > And this is the last message about above thread:
> > https://gcc.gnu.org/ml/gcc-patches/2016-04/msg01093.html
> >
> > Here is another patch trying to support a general option, however. it
> > was not merged either.
> > https://gcc.gnu.org/ml/gcc-patches/2016-12/msg01791.html
> >
> > If I read messages correctly, kernel part is not merged (partly)
> > because of waiting for GCC.  As a result, we have to apply local
> > patches, I am wondering if there is any future plan to support it on
> > AArch64, or no one really uses it?
>
> A GCC patch was merged for this already and is included in GCC 9.1.0 and above.
> See https://gcc.gnu.org/onlinedocs/gcc-9.2.0/gcc/Common-Function-Attributes.html#index-patchable_005ffunction_005fentry-function-attribute
> And
> https://gcc.gnu.org/onlinedocs/gcc-9.2.0/gcc/Instrumentation-Options.html#index-fpatchable-function-entry
>
> Someone did not add it to the GCC 9 release notes though to highlight it.
Note I Mean GCC 8 release notes as it was included in GCC 8.1.0 and above :).

Also see https://lkml.org/lkml/2017/10/13/340 for the Linux side of
discussion about this option :).


>
> Thanks,
> Andrew Pinski
>
> >
> > I CCed patch authors as well as who joined previous discussions,
> > please let me know if you don't want to be cced in this thread.
> >
> > Thanks,
> > bin


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