[PATCH V3 2/3] arm64/mm: Define arch_get_mappable_range()
From: Anshuman Khandual <hidden>
Date: 2021-01-18 13:15:29
Also in:
linux-mm, linux-s390, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
This overrides arch_get_mappable_range() on arm64 platform which will be used with recently added generic framework. It drops inside_linear_region() and subsequent check in arch_add_memory() which are no longer required. It also adds a VM_BUG_ON() check that would ensure that memhp_range_allowed() has already been called. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: David Hildenbrand <redacted> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual <redacted> --- arch/arm64/mm/mmu.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index ae0c3d023824..f2e1770c9f29 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c@@ -1442,16 +1442,19 @@ static void __remove_pgd_mapping(pgd_t *pgdir, unsigned long start, u64 size) free_empty_tables(start, end, PAGE_OFFSET, PAGE_END); } -static bool inside_linear_region(u64 start, u64 size) +struct range arch_get_mappable_range(void) { + struct range memhp_range; + /* * Linear mapping region is the range [PAGE_OFFSET..(PAGE_END - 1)] * accommodating both its ends but excluding PAGE_END. Max physical * range which can be mapped inside this linear mapping range, must * also be derived from its end points. */ - return start >= __pa(_PAGE_OFFSET(vabits_actual)) && - (start + size - 1) <= __pa(PAGE_END - 1); + memhp_range.start = __pa(_PAGE_OFFSET(vabits_actual)); + memhp_range.end = __pa(PAGE_END - 1); + return memhp_range; } int arch_add_memory(int nid, u64 start, u64 size,
@@ -1459,11 +1462,7 @@ int arch_add_memory(int nid, u64 start, u64 size, { int ret, flags = 0; - if (!inside_linear_region(start, size)) { - pr_err("[%llx %llx] is outside linear mapping region\n", start, start + size); - return -EINVAL; - } - + VM_BUG_ON(!memhp_range_allowed(start, size, true)); if (rodata_full || debug_pagealloc_enabled()) flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
--
2.20.1
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