Re: [PATCH bpf-next 1/2] cpuidle/rcu: Making arch_cpu_idle and rcu_idle_exit noinstr

From: kernel test robot <lkp@intel.com>
To: Jiri Olsa <jolsa@kernel.org>, Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	"Paul E. McKenney" <paulmck@kernel.org>
Cc: kbuild-all@lists.01.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, lkml <linux-kernel@vger.kernel.org>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Yonghong Song <yhs@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@chromium.org>,
	Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH bpf-next 1/2] cpuidle/rcu: Making arch_cpu_idle and rcu_idle_exit noinstr
Date: Tue, 17 May 2022 10:39:14 +0800	[thread overview]
Message-ID: <202205171050.9msZot6F-lkp@intel.com> (raw)
In-Reply-To: <20220515203653.4039075-1-jolsa@kernel.org>

Hi Jiri,

I love your patch! Perhaps something to improve:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Jiri-Olsa/cpuidle-rcu-Making-arch_cpu_idle-and-rcu_idle_exit-noinstr/20220516-043752
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: x86_64-randconfig-c002-20220516 (https://download.01.org/0day-ci/archive/20220517/202205171050.9msZot6F-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/0b6fee32d730f621f2bfc4d8d9f0729814398415
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jiri-Olsa/cpuidle-rcu-Making-arch_cpu_idle-and-rcu_idle_exit-noinstr/20220516-043752
        git checkout 0b6fee32d730f621f2bfc4d8d9f0729814398415
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> vmlinux.o: warning: objtool: arch_cpu_idle()+0x0: call to {dynamic}() leaves .noinstr.text section
>> vmlinux.o: warning: objtool: rcu_idle_exit()+0x16: call to trace_hardirqs_off() leaves .noinstr.text section
   vmlinux.o: warning: objtool: enter_from_user_mode()+0x18: call to __kcsan_check_access() leaves .noinstr.text section
   vmlinux.o: warning: objtool: syscall_enter_from_user_mode()+0x1d: call to __kcsan_check_access() leaves .noinstr.text section
   vmlinux.o: warning: objtool: syscall_enter_from_user_mode_prepare()+0x18: call to __kcsan_check_access() leaves .noinstr.text section
   vmlinux.o: warning: objtool: irqentry_enter_from_user_mode()+0x18: call to __kcsan_check_access() leaves .noinstr.text section

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