On Wed, Sep 18, 2019 at 9:56 PM Andrew Pinski <pins...@gmail.com> wrote: > > On Wed, Sep 18, 2019 at 9:24 PM Bin.Cheng <amker.ch...@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
