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Date:   Thu, 30 Apr 2020 21:13:08 -0400
From:   Steven Rostedt <>
To:     Joerg Roedel <>
Cc:     LKML <>,
        Ingo Molnar <>,
        Thomas Gleixner <>,
        Peter Zijlstra <>,
        Borislav Petkov <>,
        Andrew Morton <>,
        Shile Zhang <>,
        Andy Lutomirski <>,
        "Rafael J. Wysocki" <>,
        Dave Hansen <>,
        Tzvetomir Stoyanov <>,
        Mathieu Desnoyers <>
Subject: Re: [RFC][PATCH] x86/mm: Sync all vmalloc mappings before

[ Joerg, sending again this time not just to you. (hit reply to sender
  and not reply to all). Feel free to resend what you wrote before to this ]

On Thu, 30 Apr 2020 21:14:34 +0200
Joerg Roedel <> wrote:

> And alloc_percpu() calls down into pcpu_alloc(), which allocates new
> percpu chunks using vmalloc() on x86. And there we are again in the
> vmalloc area.  

So after a vmalloc() is made, should the page tables be synced?

This is a rather subtle bug, and I don't think it should be the caller of
percpu_alloc() that needs to call vmalloc_sync_mappings().

What's your suggestion for a fix?

-- Steve

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