linux-kernel - [PATCH v2 3/3] arm64/mm: Unitify CONT_PMD

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Message-Id: <20200910095936.20307-3-gshan@redhat.com>
Date:   Thu, 10 Sep 2020 19:59:36 +1000
From:   Gavin Shan <gshan@...hat.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, anshuman.khandual@....com,
        catalin.marinas@....com, will@...nel.org, shan.gavin@...il.com
Subject: [PATCH v2 3/3] arm64/mm: Unitify CONT_PMD_SHIFT

Similar to how CONT_PTE_SHIFT is determined, this introduces a new
kernel option (CONFIG_CONT_PMD_SHIFT) to determine CONT_PMD_SHIFT.

Signed-off-by: Gavin Shan <gshan@...hat.com>
---
 arch/arm64/Kconfig                     |  6 ++++++
 arch/arm64/include/asm/pgtable-hwdef.h | 10 ++--------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7ec30dd56300..d58e17fe9473 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -217,6 +217,12 @@ config ARM64_CONT_PTE_SHIFT
 	default 7 if ARM64_16K_PAGES
 	default 4
 
+config ARM64_CONT_PMD_SHIFT
+	int
+	default 5 if ARM64_64K_PAGES
+	default 5 if ARM64_16K_PAGES
+	default 4
+
 config ARCH_MMAP_RND_BITS_MIN
        default 14 if ARM64_64K_PAGES
        default 16 if ARM64_16K_PAGES
diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h
index 6c9c67f62551..94b3f2ac2e9d 100644
--- a/arch/arm64/include/asm/pgtable-hwdef.h
+++ b/arch/arm64/include/asm/pgtable-hwdef.h
@@ -82,17 +82,11 @@
  * Contiguous page definitions.
  */
 #define CONT_PTE_SHIFT		(CONFIG_ARM64_CONT_PTE_SHIFT + PAGE_SHIFT)
-#ifdef CONFIG_ARM64_64K_PAGES
-#define CONT_PMD_SHIFT		(5 + PMD_SHIFT)
-#elif defined(CONFIG_ARM64_16K_PAGES)
-#define CONT_PMD_SHIFT		(5 + PMD_SHIFT)
-#else
-#define CONT_PMD_SHIFT		(4 + PMD_SHIFT)
-#endif
-
 #define CONT_PTES		(1 << (CONT_PTE_SHIFT - PAGE_SHIFT))
 #define CONT_PTE_SIZE		(CONT_PTES * PAGE_SIZE)
 #define CONT_PTE_MASK		(~(CONT_PTE_SIZE - 1))
+
+#define CONT_PMD_SHIFT		(CONFIG_ARM64_CONT_PMD_SHIFT + PMD_SHIFT)
 #define CONT_PMDS		(1 << (CONT_PMD_SHIFT - PMD_SHIFT))
 #define CONT_PMD_SIZE		(CONT_PMDS * PMD_SIZE)
 #define CONT_PMD_MASK		(~(CONT_PMD_SIZE - 1))
-- 
2.23.0