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From:   Alexandre Ghiti <alex@ghiti.fr>
To:     aneesh.kumar@linux.ibm.com, mpe@ellerman.id.au,
        Andrew Morton <akpm@linux-foundation.org>,
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Cc:     Alexandre Ghiti <alex@ghiti.fr>
Subject: [PATCH v8 2/4] sparc: Advertise gigantic page support
Date:   Wed, 27 Mar 2019 02:36:24 -0400
Message-Id: <20190327063626.18421-3-alex@ghiti.fr>
In-Reply-To: <20190327063626.18421-1-alex@ghiti.fr>
References: <20190327063626.18421-1-alex@ghiti.fr>
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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@ghiti.fr>
Acked-by: David S. Miller <davem@davemloft.net>
---
 arch/sparc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 40f8f4f73fe8..ebcc9435db08 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -91,6 +91,7 @@ config SPARC64
 	select ARCH_CLOCKSOURCE_DATA
 	select ARCH_HAS_PTE_SPECIAL
 	select PCI_DOMAINS if PCI
+	select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
 
 config ARCH_DEFCONFIG
 	string
-- 
2.20.1