From: Anshuman Khandual anshuman.khandual@arm.com
[ Upstream commit 03aaf83fba6e5af08b5dd174c72edee9b7d9ed9b ]
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 mhp_range_allowed() has already been called.
Link: https://lkml.kernel.org/r/1612149902-7867-3-git-send-email-anshuman.khandual... Signed-off-by: Anshuman Khandual anshuman.khandual@arm.com Reviewed-by: David Hildenbrand david@redhat.com Reviewed-by: 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: Heiko Carstens hca@linux.ibm.com Cc: Jason Wang jasowang@redhat.com Cc: Jonathan Cameron Jonathan.Cameron@huawei.com Cc: "Michael S. Tsirkin" mst@redhat.com Cc: Michal Hocko mhocko@kernel.org Cc: Oscar Salvador osalvador@suse.de Cc: Pankaj Gupta pankaj.gupta@cloud.ionos.com Cc: Pankaj Gupta pankaj.gupta.linux@gmail.com Cc: teawater teawaterz@linux.alibaba.com Cc: Vasily Gorbik gor@linux.ibm.com Cc: Wei Yang richard.weiyang@linux.alibaba.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 6f0648777d34..92b3be127796 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -1443,16 +1443,19 @@ 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 mhp_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); + mhp_range.start = __pa(_PAGE_OFFSET(vabits_actual)); + mhp_range.end = __pa(PAGE_END - 1); + return mhp_range; }
int arch_add_memory(int nid, u64 start, u64 size, @@ -1460,11 +1463,7 @@ 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(!mhp_range_allowed(start, size, true)); if (rodata_full || debug_pagealloc_enabled()) flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;