linux-kernel - Re: [PATCH] powerpc/hugetlb: Fix 512k hugepages on 8xx with 16k page size

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Message-Id: <48My3W5Zfyz9sSL@ozlabs.org>
Date:   Wed, 19 Feb 2020 23:39:51 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, aneesh.kumar@...ux.ibm.com
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/hugetlb: Fix 512k hugepages on 8xx with 16k page size

On Thu, 2020-02-06 at 13:50:28 UTC, Christophe Leroy wrote:
> Commit 55c8fc3f4930 ("powerpc/8xx: reintroduce 16K pages with HW
> assistance") redefined pte_t as a struct of 4 pte_basic_t, because
> in 16K pages mode there are four identical entries in the
> page table. But the size of hugepage tables is calculated based
> of the size of (void *). Therefore, we end up with page tables
> of size 1k instead of 4k for 512k pages.
> 
> As 512k hugepage tables are the same size as standard page tables,
> ie 4k, use the standard page tables instead of PGT_CACHE tables.
> 
> Fixes: 3fb69c6a1a13 ("powerpc/8xx: Enable 512k hugepage support with HW assistance")
> Cc: stable@...r.kernel.org
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/f2b67ef90b0d5eca0f2255e02cf2f620bc0ddcdb

cheers