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| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2021-05-10 17:52:06 +0530 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-05-25 18:54:39 +0100 |
| commit | 7e04cc918954f9090952e8d17cb2c3c4a5ad055e (patch) | |
| tree | 1443dbbca16a5f0a017e079ea7cdd2312c98a256 /arch/arm64/mm/init.c | |
| parent | c4681547bcce777daf576925a966ffa824edd09d (diff) | |
| download | linux-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.c | 7 |
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; /* |