GitHub pull request #3315 of commit f9ed7d84eb8af50737d983346846ae43a1deefc3, no merge conflicts.sha1origin/pr/3315/mergeghprbActualCommitf9ed7d84eb8af50737d983346846ae43a1deefc3ghprbActualCommitAuthorghprbActualCommitAuthorEmailghprbAuthorRepoGitUrlhttps://github.com/docularxu/bcc.gitghprbTriggerAuthorghprbTriggerAuthorEmailghprbTriggerAuthorLoginyonghong-songghprbTriggerAuthorLoginMention@yonghong-songghprbPullId3315ghprbTargetBranchmasterghprbSourceBranchworking_gcc10_wayGIT_BRANCHworking_gcc10_wayghprbPullAuthorEmailguodong.xu@linaro.orgghprbPullAuthorLogindocularxughprbPullAuthorLoginMention@docularxughprbPullDescriptionGitHub pull request #3315 of commit f9ed7d84eb8af50737d983346846ae43a1deefc3, no merge conflicts.ghprbPullTitleIn GCC10.2 suffix '.isra.0' was appended to 'finish_task_switch'ghprbPullLinkhttps://github.com/iovisor/bcc/pull/3315ghprbPullLongDescriptionWhen buildiing kernel with GCC10 [2] in Debian on an Arm64 machine, it was\r\nfound the new \"inter-procedural optimization improvements\" [1] makes symbol\r\nname 'finish_task_switch' changed to 'finish_task_switch.isra.0'.\r\n\r\nDetails:\r\nThe results, when built with gcc 9.3:\r\nnm ../linux.buildout/kernel/sched/core.o | grep finish_task_switch\r\n0000000000001288 t finish_task_switch\r\n\r\nHowever, when built with gcc 10.2:\r\nnm ../linux.buildout/kernel/sched/core.o | grep finish_task_switch\r\n00000000000012d0 t finish_task_switch.isra.0\r\n\r\nThe same symbols (with xxx.isra.0 or without, respectively of course) also\r\nappear in final file 'System.map' and in '/proc/kallsyms' when booting. This\r\nnegatively impact the tracing tools commonly used in kernel debugging, such\r\nas bcc tools offcputime and runqlat. They hardcode 'finish_task_switch'\r\n(without the .isra.0 suffix) into their scripts.\r\n\r\nThis patch fix the issue by changing the hardcoded 'finish_task_switch' string\r\nto a python regular expression pattern who can match both the traditional form\r\n'finish_task_switch' and the new gcc10 form 'finish_task_switch.isra.0'\r\n(with single digit at the end). attach_kprobe()'s input parameter 'event_re'\r\nis used for this type of pattern matching.\r\n\r\n[1] https://gcc.gnu.org/gcc-10/changes.html\r\n[2] ARCH=arm64 make Image\r\n\r\nSigned-off-by: Guodong Xu <guodong.xu@linaro.org>ghprbCommentBody[buildbot, test this please]ghprbGhRepositoryiovisor/bccghprbCredentialsId6d3daf13-69b8-48b1-9c8f-ec5353264113false<a title="In GCC10.2 suffix '.isra.0' was appended to 'finish_task_switch'" href="https://github.com/iovisor/bcc/pull/3315">PR #3315</a>: In GCC10.2 suffix '.isra.0'...#88813144637460664bcc-pr #888888false8887113SUCCESS1615705677010https://buildbot.iovisor.org/jenkins/job/bcc-pr/888/git888https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=fc25/888/888https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=fc26/888/888https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=fc27/888/888https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=fc28/888/888https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=ubuntu1604/888/888https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=ubuntu1710/888/888https://buildbot.iovisor.org/jenkins/job/bcc-pr/label=ubuntu1804/888/