linux-kernel - [PATCH] ARC: add hugetlb definitions

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Date:   Wed, 13 Dec 2023 19:07:10 +0400
From:   Pavel Kozlov <Pavel.Kozlov@...opsys.com>
To:     linux-snps-arc@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Vineet Gupta <vgupta@...nel.org>,
        Pavel Kozlov <Pavel.Kozlov@...opsys.com>
Subject: [PATCH] ARC: add hugetlb definitions

From: Pavel Kozlov <pavel.kozlov@...opsys.com>

Add hugetlb definitions if THP enabled. ARC doesn't support
HugeTLB FS but it supports THP. Some kernel code such as pagemap
uses hugetlb definitions with THP.

This patch fixes ARC build issue (HPAGE_SIZE undeclared error) with
TRANSPARENT_HUGEPAGE enabled.

Signed-off-by: Pavel Kozlov <pavel.kozlov@...opsys.com>
---
 arch/arc/include/asm/hugepage.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arc/include/asm/hugepage.h b/arch/arc/include/asm/hugepage.h
index ef8d4166370c..8a2441670a8f 100644
--- a/arch/arc/include/asm/hugepage.h
+++ b/arch/arc/include/asm/hugepage.h
@@ -10,6 +10,13 @@
 #include <linux/types.h>
 #include <asm-generic/pgtable-nopmd.h>
 
+/*
+ * Hugetlb definitions.
+ */
+#define HPAGE_SHIFT		PMD_SHIFT
+#define HPAGE_SIZE		(_AC(1, UL) << HPAGE_SHIFT)
+#define HPAGE_MASK		(~(HPAGE_SIZE - 1))
+
 static inline pte_t pmd_pte(pmd_t pmd)
 {
 	return __pte(pmd_val(pmd));
-- 
2.25.1