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Message-ID: <b686a7e397b992cf7a32b2e5e7c3503919a8c717.camel@surriel.com>
Subject: Re: [RFC PATCH 1/2] mm: move tlb_table_flush to tlb_flush_mmu_free
From: Rik van Riel <riel@surriel.com>
Date: Fri, 07 Sep 2018 10:28:05 -0400
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To: Will Deacon <will.deacon@arm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>, Peter Zijlstra <peterz@infradead.org>, torvalds@linux-foundation.org, luto@kernel.org, x86@kernel.org, bp@alien8.de, jannh@google.com, ascannell@google.com, dave.hansen@intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, David Miller <davem@davemloft.net>, Martin Schwidefsky <schwidefsky@de.ibm.com>, Michael Ellerman <mpe@ellerman.id.au>, linux-arch@vger.kernel.org
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On Fri, 2018-09-07 at 14:44 +0100, Will Deacon wrote:
> On Thu, Sep 06, 2018 at 04:29:59PM -0400, Rik van Riel wrote:
> > On Thu, 2018-08-23 at 18:47 +1000, Nicholas Piggin wrote:
> > > There is no need to call this from tlb_flush_mmu_tlbonly, it
> > > logically belongs with tlb_flush_mmu_free. This allows some
> > > code consolidation with a subsequent fix.
> > >=20
> > > Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> >=20
> > Reviewed-by: Rik van Riel <riel@surriel.com>
> >=20
> > This patch also fixes an infinite recursion bug
> > with CONFIG_HAVE_RCU_TABLE_FREE enabled, which
> > has this call trace:
> >=20
> > tlb_table_flush
> >   -> tlb_table_invalidate
> >      -> tlb_flush_mmu_tlbonly
> >         -> tlb_table_flush
> >            -> ... (infinite recursion)
> >=20
> > This should probably be applied sooner rather than
> > later.
>=20
> It's already in mainline with a cc stable afaict.

Sure enough, it is.

I guess I have too many kernel trees on this
system, and was looking at the wrong one somehow.

--=20
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