On Thu, Dec 07, 2017 at 08:30:49AM +0900, Masami Hiramatsu wrote: > On Wed, 6 Dec 2017 13:47:38 -0800 > "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> wrote: > > > On Wed, Dec 06, 2017 at 09:56:36PM +0100, Arnd Bergmann wrote: > > > On Wed, Dec 6, 2017 at 8:24 PM, kernelci.org bot <bot@xxxxxxxxxxxx> wrote: > > > > > > > > stable-rc/linux-3.18.y build: 184 builds: 3 failed, 181 passed, 3 errors (v3.18.86-23-g635374e30005) > > > > Full Build Summary: https://kernelci.org/build/stable-rc/branch/linux-3.18.y/kernel/v3.18.86-23-g635374e30005/ > > > > Tree: stable-rc > > > > Branch: linux-3.18.y > > > > Git Describe: v3.18.86-23-g635374e30005 > > > > Git Commit: 635374e300051ce71a548aff2c469fbda3910c21 > > > > Git URL: http://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git > > > > Built: 4 unique architectures > > > > > > > > Build Failures Detected: > > > > > > > > x86: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) > > > > defconfig+CONFIG_LKDTM=y FAIL > > > > i386_defconfig FAIL > > > > x86_64_defconfig FAIL > > > > > > > > Errors Detected: > > > > > > > > x86: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) > > > > defconfig+CONFIG_LKDTM=y 1 error > > > > i386_defconfig 1 error > > > > x86_64_defconfig 1 error > > > > Errors summary: > > > > 2 kprobes.c:(.text+0x91f42): undefined reference to `synchronize_rcu_tasks' > > > > 1 kprobes.c:(.text+0x80dc8): undefined reference to `synchronize_rcu_tasks' > > > > > > Same as v4.9, caused by 98efb31592b4 ("kprobes: Use synchronize_rcu_tasks() > > > for optprobe with CONFIG_PREEMPT=y"). > > > > Looks to me like they are both missing 7e42776d5ed1f ("rcu: Drive > > TASKS_RCU directly off of PREEMPT"), which is shown below. > > > > Masami, how would you like to proceed? > > I think the commit 98efb31592b4 is an improvement patch, > so do not need to pull on 3.18. Maybe 4.14 is easy to pull > because we just need below patch. but for 3.18, it needs > more depending patches, doesn't it? Yeah, this is messy, I've dropped it from 3.18 and 4.9, thanks. greg k-h