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Re: [PATCH] x86/mm: disable preemption during CR3 read+write

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On 08/05/2016 05:42 PM, Andy Lutomirski wrote:
> 
> This should affect kernel threads too, right?

I don't think so because they don't have a MM in the first place so
they don't shouldn't need to flush a TLB. But then there is iounmap()
and vfree() for instance which does

vmap_debug_free_range()
{
   if (debug_pagealloc_enabled()) {
         vunmap_page_range(start, end);
         flush_tlb_kernel_range(start, end);
   }
}

so it looks like a candidate.

> Acked-by: Andy Lutomirski <luto@kernel.org>

Sebastian

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Thread

[PATCH] x86/mm: disable preemption during CR3 read+write Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-08-05 15:40 +0200
  Re: [PATCH] x86/mm: disable preemption during CR3 read+write Peter Zijlstra <peterz@infradead.org> - 2016-08-05 16:00 +0200
  Re: [PATCH] x86/mm: disable preemption during CR3 read+write Rik van Riel <riel@redhat.com> - 2016-08-05 16:40 +0200
  Re: [PATCH] x86/mm: disable preemption during CR3 read+write Andy Lutomirski <luto@amacapital.net> - 2016-08-05 17:50 +0200
    Re: [PATCH] x86/mm: disable preemption during CR3 read+write Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-08-05 18:00 +0200
  [tip:x86/urgent] x86/mm: Disable preemption during CR3 read+write tip-bot for Sebastian Andrzej Siewior <tipbot@zytor.com> - 2016-08-10 23:00 +0200

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