linux-kernel - Re: [bug report][stable] perf probe: failed to add events

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Message-ID: <20190321101029.GA3650@kroah.com>
Date:   Thu, 21 Mar 2019 11:10:29 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        luto@...nel.org, Jiufei Xue <jiufei.xue@...ux.alibaba.com>,
        Xu Yu <xuyu@...ux.alibaba.com>, peterz@...radead.org,
        mingo@...hat.com
Subject: Re: [bug report][stable] perf probe: failed to add events

On Thu, Feb 28, 2019 at 09:19:08AM +0200, Adrian Hunter wrote:
> On 28/02/19 4:07 AM, Joseph Qi wrote:
> > Hi Adrian,
> > 
> > On 19/2/27 20:39, Adrian Hunter wrote:
> >> Seems to be fixed by this:
> >>
> >> From: Adrian Hunter <adrian.hunter@...el.com>
> >> Date: Wed, 27 Feb 2019 05:35:25 +0200
> >> Subject: [PATCH] perf probe: Fix getting the kernel map
> >>
> >> Since commit 4d99e4136580 ("perf machine: Workaround missing maps for x86
> >> PTI entry trampolines"), perf tools has been creating more than one kernel
> >> map, however 'perf probe' assumed there could be only one.
> >>
> >> Fix by using machine__kernel_map() to get the main kernel map.
> >>
> >> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> >> Fixes: 4d99e4136580 ("perf machine: Workaround missing maps for x86 PTI entry trampolines")
> > 
> > Below is my investigation result before, FYI.
> > the first bad commit (v4.18 ~ v4.19):
> > d83212d5dd67 kallsyms, x86: Export addresses of PTI entry trampolines
> 
> Yes we should add a fixes tag for that also.

So, what do I need to do here for the stable tree(s) to resolve this
issue?

thanks,

greg k-h