linux-kernel - RE: [PATCH v3] hyperv: simplify and rename generate_guest

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Date:   Sat, 24 Sep 2022 05:31:34 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Olaf Hering <olaf@...fle.de>, Li kunyu <kunyu@...china.com>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>, "arnd@...db.de" <arnd@...db.de>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: RE: [PATCH v3] hyperv: simplify and rename generate_guest_id

From: Olaf Hering <olaf@...fle.de> Sent: Friday, September 23, 2022 2:09 PM
> 
> Fri, 23 Sep 2022 19:42:59 +0800 Li kunyu <kunyu@...china.com>:
> 
> > +++ b/include/asm-generic/mshyperv.h
> > +#include <linux/version.h>
> 
> A very long time ago I removed most usage of version.h AFAIR,
> so that changing uname -r will dirty just a tiny amount of objects.
> 
> But, this header is always coming back, like bad weed.
> 
> Please reconsider the suggested approach.

Could you elaborate?  This code is getting the Linux kernel version
to pass to the hypervisor for later diagnostic purposes.  In a large
cloud environment like Azure, it's helpful sometimes to be able to
correlate emerging fleet-wide issues to particular kernel versions.
The Hyper-V code in Linux has been using LINUX_VERSION_CODE
this way for the past 10 years, so this isn't new.

Is there a more preferred mechanism for kernel code to get its version? 

Michael