linux-kernel - Re: [PATCH v5 2/4] sparc: Advertise gigantic page support

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Message-Id: <20190306.110436.1714716608828903522.davem@davemloft.net>
Date:   Wed, 06 Mar 2019 11:04:36 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     alex@...ti.fr
Cc:     vbabka@...e.cz, catalin.marinas@....com, will.deacon@....com,
        benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
        ysato@...rs.sourceforge.jp, dalias@...c.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        mike.kravetz@...cle.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v5 2/4] sparc: Advertise gigantic page support

From: Alexandre Ghiti <alex@...ti.fr>
Date: Wed,  6 Mar 2019 14:00:03 -0500

> sparc actually supports gigantic pages and selecting
> ARCH_HAS_GIGANTIC_PAGE allows it to allocate and free
> gigantic pages at runtime.
> 
> sparc allows configuration such as huge pages of 16GB,
> pages of 8KB and MAX_ORDER = 13 (default):
> HPAGE_SHIFT (34) - PAGE_SHIFT (13) = 21 >= MAX_ORDER (13)
> 
> Signed-off-by: Alexandre Ghiti <alex@...ti.fr>

Much better.

Acked-by: David S. Miller <davem@...emloft.net>