From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Anshuman Khandual Subject: [RFC V2 2/3] arm64/mm: Define arch_get_mappable_range() Date: Mon, 30 Nov 2020 08:59:51 +0530 Message-Id: <1606706992-26656-3-git-send-email-anshuman.khandual@arm.com> In-Reply-To: <1606706992-26656-1-git-send-email-anshuman.khandual@arm.com> References: <1606706992-26656-1-git-send-email-anshuman.khandual@arm.com> List-ID: To: linux-mm@kvack.org, akpm@linux-foundation.org, david@redhat.com Cc: linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Anshuman Khandual , Catalin Marinas , Will Deacon , Ard Biesheuvel , Mark Rutland 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. Cc: Catalin Marinas Cc: Will Deacon Cc: Ard Biesheuvel Cc: Mark Rutland Cc: David Hildenbrand Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual --- arch/arm64/mm/mmu.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index ca692a815731..49ec8f2838f2 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -1444,16 +1444,19 @@ 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, @@ -1461,11 +1464,6 @@ 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; - } - if (rodata_full || debug_pagealloc_enabled()) flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS; -- 2.20.1