Groups > linux.kernel > #1320270

Re: [PATCH v6 0/9] ftrace with regs + live patching for ppc64 LE (ABI v2)

From	Michael Ellerman <mpe@ellerman.id.au>
Newsgroups	linux.kernel
Subject	Re: [PATCH v6 0/9] ftrace with regs + live patching for ppc64 LE (ABI v2)
Date	2016-01-28 04:40 +0100
Message-ID	<qVLB7-5Fa-3@gated-at.bofh.it> (permalink)
References	<qUSOm-7cE-23@gated-at.bofh.it> <qVvZo-2he-15@gated-at.bofh.it> <qVxeP-3jH-9@gated-at.bofh.it> <qVKOK-4TF-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Thu, 2016-01-28 at 13:41 +1100, Balbir Singh wrote:
> On Wed, 27 Jan 2016 13:19:04 +0100
> Torsten Duwe <duwe@lst.de> wrote:
>
> > Thanks! Make sure you use a compiler that can disable -mprofile-kernel with "notrace".
> 
> gcc-6? I have gcc-5.2.1

That should work.

But that's a good point.

We need to have some Makefile logic to only enable -mprofile-kernel when it's
known to work, ie. for versions where the notrace fix is in.

Looking at GCC history it looks like the fix is in 4.9.0 and anything later.

But a version check doesn't work with patched distro/vendor toolchains. So we
probably need some sort of runtime check.

cheers

Thread

[PATCH v6 0/9] ftrace with regs + live patching for ppc64 LE (ABI v2) Torsten Duwe <duwe@lst.de> - 2016-01-25 18:10 +0100
  [PATCH v6 5/9] ppc64 ftrace_with_regs: spare early boot and low level Torsten Duwe <duwe@lst.de> - 2016-01-25 18:10 +0100
  [PATCH v6 8/9] Implement kernel live patching for ppc64le (ABIv2) Torsten Duwe <duwe@lst.de> - 2016-01-25 18:10 +0100
    Re: [PATCH v6 8/9] Implement kernel live patching for ppc64le  (ABIv2) Miroslav Benes <mbenes@suse.cz> - 2016-01-26 12:00 +0100
      Re: [PATCH v6 8/9] Implement kernel live patching for ppc64le (ABIv2) Petr Mladek <pmladek@suse.com> - 2016-01-26 13:50 +0100
        Re: [PATCH v6 8/9] Implement kernel live patching for ppc64le  (ABIv2) Torsten Duwe <duwe@lst.de> - 2016-01-26 15:00 +0100
        Re: [PATCH v6 8/9] Implement kernel live patching for ppc64le (ABIv2) Petr Mladek <pmladek@suse.com> - 2016-02-02 13:20 +0100
          Re: [PATCH v6 8/9] Implement kernel live patching for ppc64le  (ABIv2) Torsten Duwe <duwe@lst.de> - 2016-02-02 16:50 +0100
            Re: [PATCH v6 8/9] Implement kernel live patching for ppc64le (ABIv2) Petr Mladek <pmladek@suse.com> - 2016-02-02 17:50 +0100
              Re: [PATCH v6 8/9] Implement kernel live patching for ppc64le  (ABIv2) Jiri Kosina <jikos@kernel.org> - 2016-02-02 21:40 +0100
      Re: [PATCH v6 8/9] Implement kernel live patching for ppc64le  (ABIv2) Torsten Duwe <duwe@lst.de> - 2016-01-26 15:10 +0100
        Re: [PATCH v6 8/9] Implement kernel live patching for ppc64le  (ABIv2) Miroslav Benes <mbenes@suse.cz> - 2016-01-26 15:20 +0100
          Re: Implement kernel live patching for ppc64le (ABIv2) Jessica Yu <jeyu@redhat.com> - 2016-01-27 03:00 +0100
    Re: [PATCH v6 8/9] Implement kernel live patching for ppc64le (ABIv2) Denis Kirjanov <kda@linux-powerpc.org> - 2016-02-02 14:50 +0100
  [PATCH v6 2/9] ppc64le FTRACE_WITH_REGS implementation Torsten Duwe <duwe@lst.de> - 2016-01-25 18:10 +0100
  [PATCH v6 7/9] ppc64 ftrace: disable profiling for some files Torsten Duwe <duwe@lst.de> - 2016-01-25 18:20 +0100
  Re: [PATCH v6 0/9] ftrace with regs + live patching for ppc64 LE  (ABI v2) Balbir Singh <bsingharora@gmail.com> - 2016-01-27 12:00 +0100
    Re: [PATCH v6 0/9] ftrace with regs + live patching for ppc64 LE  (ABI v2) Torsten Duwe <duwe@lst.de> - 2016-01-27 13:20 +0100
      Re: [PATCH v6 0/9] ftrace with regs + live patching for ppc64 LE  (ABI v2) Balbir Singh <bsingharora@gmail.com> - 2016-01-28 03:50 +0100
        Re: [PATCH v6 0/9] ftrace with regs + live patching for ppc64 LE  (ABI v2) Michael Ellerman <mpe@ellerman.id.au> - 2016-01-28 04:40 +0100
          Re: [PATCH v6 0/9] ftrace with regs + live patching for ppc64 LE  (ABI v2) Torsten Duwe <duwe@lst.de> - 2016-01-28 12:20 +0100

csiph-web