linux-kernel - Re: [PATCH] Revert "MIPS: Remove race window in page fault handling"

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Date:	Wed, 3 Dec 2014 14:42:26 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Lars Persson <lars.persson@...s.com>
Cc:	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	"james.hogan@...tec.com" <james.hogan@...tec.com>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"paul.burton@...tec.com" <paul.burton@...tec.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"manuel.lauss@...il.com" <manuel.lauss@...il.com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"blogic@...nwrt.org" <blogic@...nwrt.org>,
	"markos.chandras@...tec.com" <markos.chandras@...tec.com>
Subject: Re: [PATCH] Revert "MIPS: Remove race window in page fault handling"

Lars,

normally set_pte_at() is invoked in a 

  cache_flush_*()
  set_pte_at()
  tlb_flush_*()

sequence.  So I'm wondering if you're trying to fix something in set_pte_at
that actually ought to be fixed in the cache_flush_*() function.

I'm wondering, have you identified which cache flush function in particular
was used in the sequence in your particular bug's case?

  Ralf
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