From: Anshuman Khandual <anshuman.khandual@arm.com>
To: linux-mm@kvack.org, akpm@linux-foundation.org, david@redhat.com,
hca@linux.ibm.com, catalin.marinas@arm.com
Cc: linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org,
linux-kernel@vger.kernel.org,
Anshuman Khandual <anshuman.khandual@arm.com>,
Vasily Gorbik <gor@linux.ibm.com>, Will Deacon <will@kernel.org>,
Ard Biesheuvel <ardb@kernel.org>,
Mark Rutland <mark.rutland@arm.com>
Subject: [PATCH V2 2/3] arm64/mm: Define arch_get_mappable_range()
Date: Thu, 17 Dec 2020 20:58:31 +0530 [thread overview]
Message-ID: <1608218912-28932-3-git-send-email-anshuman.khandual@arm.com> (raw)
In-Reply-To: <1608218912-28932-1-git-send-email-anshuman.khandual@arm.com>
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 <david@redhat.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
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 ca692a815731..54705dcacb4e 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 +1464,7 @@ 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, 1));
if (rodata_full || debug_pagealloc_enabled())
flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
--
2.20.1
next prev parent reply other threads:[~2020-12-17 15:28 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-17 15:28 [PATCH V2 0/3] mm/hotplug: Pre-validate the address range with platform Anshuman Khandual
2020-12-17 15:28 ` [PATCH V2 1/3] mm/hotplug: Prevalidate the address range being added " Anshuman Khandual
2021-01-11 10:51 ` David Hildenbrand
2021-01-11 13:43 ` Oscar Salvador
2021-01-12 3:51 ` Anshuman Khandual
2021-01-12 10:09 ` David Hildenbrand
2021-01-13 5:04 ` Anshuman Khandual
2021-01-12 3:43 ` Anshuman Khandual
2020-12-17 15:28 ` Anshuman Khandual [this message]
2020-12-17 15:28 ` [PATCH V2 3/3] s390/mm: Define arch_get_mappable_range() Anshuman Khandual
2021-01-11 10:40 ` David Hildenbrand
2021-01-13 7:02 ` Anshuman Khandual
2020-12-17 17:31 ` [PATCH V2 0/3] mm/hotplug: Pre-validate the address range with platform David Hildenbrand
2021-01-11 12:41 ` [PATCH RFC] virtio-mem: check against memhp_get_pluggable_range() which memory we can hotplug David Hildenbrand
2021-01-12 4:25 ` Anshuman Khandual
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