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

[Greg Kroah-Hartman]

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