Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Wed, 4 Sep 2019 11:33:30 -0400
From:   Joel Fernandes <joel@joelfernandes.org>
To:     Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Andy Lutomirski <luto@kernel.org>,
        Jirka =?iso-8859-1?Q?Hladk=FD?= <jhladky@redhat.com>,
        =?utf-8?B?SmnFmcOtIFZvesOhcg==?= <jvozar@redhat.com>,
        X86 ML <x86@kernel.org>, Qais Yousef <qais.yousef@arm.com>
Subject: Re: [PATCH 2/2] sched/debug: add sched_update_nr_running tracepoint
Message-ID: <20190904153330.GI240514@google.com>
References: <20190903154340.860299-1-rkrcmar@redhat.com>
 <20190903154340.860299-3-rkrcmar@redhat.com>
 <a2924d91-df68-42de-0709-af53649346d5@arm.com>
 <20190904042310.GA159235@google.com>
 <20190904081448.GZ2349@hirez.programming.kicks-ass.net>
 <20190904131154.GF144846@google.com>
 <CAADnVQL3CsB6z98BFWd8wn7WKk+W4UVH2NbzrhJgeaU-D-n3ug@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAADnVQL3CsB6z98BFWd8wn7WKk+W4UVH2NbzrhJgeaU-D-n3ug@mail.gmail.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Wed, Sep 04, 2019 at 08:26:52AM -0700, Alexei Starovoitov wrote:
> On Wed, Sep 4, 2019 at 6:14 AM Joel Fernandes <joel@joelfernandes.org> wrote:
> >
> > True. However, for kprobes-based BPF program - it does check for kernel
> > version to ensure that the BPF program is built against the right kernel
> > version (in order to ensure the program is built against the right set of
> > kernel headers). If it is not, then BPF refuses to load the program.
> 
> This is not true anymore. Users found few ways to workaround that check
> in practice. It became useless and it was deleted some time ago.

Wow, Ok! Interesting!

thanks,

 - Joel