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authorAnshuman Khandual <anshuman.khandual@arm.com>2021-05-10 17:52:06 +0530
committerWill Deacon <will@kernel.org>2021-05-25 18:54:39 +0100
commit7e04cc918954f9090952e8d17cb2c3c4a5ad055e (patch)
tree1443dbbca16a5f0a017e079ea7cdd2312c98a256 /arch/arm64/mm/init.c
parentc4681547bcce777daf576925a966ffa824edd09d (diff)
downloadlinux-7e04cc918954f9090952e8d17cb2c3c4a5ad055e.tar.bz2
arm64/mm: Validate CONFIG_PGTABLE_LEVELS
CONFIG_PGTABLE_LEVELS has been statically defined in (arch/arm64/Kconfig) depending on the page size and requested virtual address range. In order to validate this page table levels selection this adds a BUILD_BUG_ON() as per the existing formula ARM64_HW_PGTABLE_LEVELS(). This would help protect any inadvertent changes to CONFIG_PGTABLE_LEVELS selection. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Link: https://lore.kernel.org/r/1620649326-24115-1-git-send-email-anshuman.khandual@arm.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/mm/init.c')
-rw-r--r--arch/arm64/mm/init.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index e55409caaee3..6e1ca044ca90 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -499,6 +499,13 @@ void __init mem_init(void)
BUILD_BUG_ON(TASK_SIZE_32 > DEFAULT_MAP_WINDOW_64);
#endif
+ /*
+ * Selected page table levels should match when derived from
+ * scratch using the virtual address range and page size.
+ */
+ BUILD_BUG_ON(ARM64_HW_PGTABLE_LEVELS(CONFIG_ARM64_VA_BITS) !=
+ CONFIG_PGTABLE_LEVELS);
+
if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
extern int sysctl_overcommit_memory;
/*