[PATCH 18/19] mm: define default PGTABLE_LEVELS to two
From: Kirill A. Shutemov <hidden>
Date: 2015-01-30 14:46:26
Also in:
lkml
Subsystem:
generic include/asm header files, the rest · Maintainers:
Arnd Bergmann, Linus Torvalds
By this time all architectures which support more than two page table levels should be covered. This patch add default definiton of PGTABLE_LEVELS equal 2. We also add assert to detect inconsistence between CONFIG_PGTABLE_LEVELS and __PAGETABLE_PMD_FOLDED/__PAGETABLE_PUD_FOLDED. Signed-off-by: Kirill A. Shutemov <redacted> --- arch/Kconfig | 4 ++++ include/asm-generic/pgtable.h | 5 +++++ 2 files changed, 9 insertions(+)
diff --git a/arch/Kconfig b/arch/Kconfig
index 05d7a8a458d5..a9c95d36ba70 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig@@ -484,6 +484,10 @@ config HAVE_IRQ_EXIT_ON_IRQ_STACK This spares a stack switch and improves cache usage on softirq processing. +config PGTABLE_LEVELS + int + default 2 + # # ABI hall of shame #
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 4d46085c1b90..1f9f5da6828f 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h@@ -7,6 +7,11 @@ #include <linux/mm_types.h> #include <linux/bug.h> +#if 4 - defined(__PAGETABLE_PUD_FOLDED) - defined(__PAGETABLE_PMD_FOLDED) != \ + CONFIG_PGTABLE_LEVELS +#error CONFIG_PGTABLE_LEVELS is not consistent with __PAGETABLE_{PUD,PMD}_FOLDED +#endif + /* * On almost all architectures and configurations, 0 can be used as the * upper ceiling to free_pgtables(): on many architectures it has the same
--
2.1.4
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