From: Gavin Shan <gshan@redhat.com>
Date: Thu, 10 Sep 2020 09:59:36 +0000 (+1000)
Subject: arm64/mm: Unify CONT_PMD_SHIFT
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=e676594115f0bcc12d4791f9ee919e20d8d750ee;p=linux.git
arm64/mm: Unify 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@redhat.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20200910095936.20307-3-gshan@redhat.com
Signed-off-by: Will Deacon <will@kernel.org>
---
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 4f3b7b24b5e5..609629e36779 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))