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Date:   Wed, 7 Mar 2018 09:30:36 -0800
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Tim Chen <tim.c.chen@linux.intel.com>
Cc:     stable@vger.kernel.org, Andy Lutomirski <luto@kernel.org>,
        Nadav Amit <nadav.amit@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Mel Gorman <mgorman@suse.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Rik van Riel <riel@redhat.com>,
        Ingo Molnar <mingo@kernel.org>,
        David Woodhouse <dwmw@amazon.co.uk>, ak@linux.intel.com,
        karahmed@amazon.de, pbonzini@redhat.com, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] x86/mm: Give each mm a unique ID
Message-ID: <20180307173036.GJ7097@kroah.com>
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On Fri, Mar 02, 2018 at 01:32:09PM -0800, Tim Chen wrote:
> From: Andy Lutomirski <luto@kernel.org>
> commit: f39681ed0f48498b80455095376f11535feea332
> 
> This adds a new variable to mmu_context_t: ctx_id.
> ctx_id uniquely identifies the mm_struct and will never be reused.
> 
> Signed-off-by: Andy Lutomirski <luto@kernel.org>
> Reviewed-by: Nadav Amit <nadav.amit@gmail.com>
> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Arjan van de Ven <arjan@linux.intel.com>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: Dave Hansen <dave.hansen@intel.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Mel Gorman <mgorman@suse.de>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Rik van Riel <riel@redhat.com>
> Cc: linux-mm@kvack.org
> Link: http://lkml.kernel.org/r/413a91c24dab3ed0caa5f4e4d017d87b0857f920.1498751203.git.luto@kernel.org
> Signed-off-by: Ingo Molnar <mingo@kernel.org>
> Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
> ---
>  arch/x86/include/asm/mmu.h         | 15 +++++++++++++--
>  arch/x86/include/asm/mmu_context.h |  5 +++++
>  arch/x86/mm/tlb.c                  |  2 ++
>  3 files changed, 20 insertions(+), 2 deletions(-)
> 

Does not apply to 4.4.y :(

Can you provide a working backport for that tree?

thanks,

greg k-h