linux-kernel - Re: [PATCH 4.9 033/120] perf/x86/intel/uncore: Fix hardcoded socket 0 assumption in the Haswell init code

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Message-ID: <20170118163350.GA10804@kroah.com>
Date:   Wed, 18 Jan 2017 17:33:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Prarit Bhargava <prarit@...hat.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Borislav Petkov <bp@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
        Harish Chegondi <harish.chegondi@...el.com>,
        Jiri Olsa <jolsa@...hat.com>, Kan Liang <kan.liang@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephane Eranian <eranian@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 4.9 033/120] perf/x86/intel/uncore: Fix hardcoded socket
 0 assumption in the Haswell init code

On Wed, Jan 18, 2017 at 09:38:07AM -0500, Prarit Bhargava wrote:
> 
> 
> On 01/18/2017 05:45 AM, Greg Kroah-Hartman wrote:
> > 4.9-stable review patch.  If anyone has any objections, please let me know.
> > 
> 
> Nack.
> 
> The value of boot_cpu_data.logical_proc_id may be uninitialized and set to
> default -1 on systems that pick a random core as boot cpu.  This was
> inadvertently fixed by 9d85eb9119f4 ("x86/smpboot: Make logical package
> management more robust") which is in 4.10-rc1.
> 
> Before 9d85eb9119f4:
> 
> [    3.971539] hswep_uncore_cpu_init: cpu 5 pkg 0 boot_cpu_data.logical_proc_id
> 65535
> [    3.976504] hswep_uncore_cpu_init: cpu 5 pkg 0 cpu_data(0).logical_proc_id 0
> 
> After 9d85eb9119f4:
> 
> [    3.919112] hswep_uncore_cpu_init: cpu 5 pkg 0 boot_cpu_data.logical_proc_id 0
> [    3.923391] hswep_uncore_cpu_init: cpu 5 pkg 0 cpu_data(0).logical_proc_id 0
> 
> This patch should not be applied to any stable branch.

So the fixes: line lies?  This isn't needed at all for 4.9?

confused,

greg k-h