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To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
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From: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org,
 "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: Re: [2/8] powerpc/mm: add _PAGE_HASHPTE similar to 4K hash
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Date: Fri,  4 Mar 2016 11:40:08 +1100 (AEDT)
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On Tue, 2016-01-03 at 07:29:18 UTC, "Aneesh Kumar K.V" wrote:
> We don't need to update linux page table entry with _PAGE_HASHPTE early
> in hash pte fault. A parallel pte update will loop via _PAGE_BUSY
> and look at _PAGE_HASHPTE for a required hpte flush only if
> _PAGE_BUSY is cleared. That ensures a pte update will wait for a
> parallel hpte insert to finish before looking at _PAGE_HASHPTE bit.
> 
> To avoid further confusion drop setting _PAGE_HASHPTE in cmpxchg in __hash_page_4K.
> 
> commit 41743a4e34f0 ("powerpc: Free a PTE bit on ppc64 with 64K pages")
> did similar change for 64K config
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/c367a44133bcd7f94fb48b58e9

cheers