From: David Hildenbrand <david@redhat.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>,
linux-mm@kvack.org, akpm@linux-foundation.org, hca@linux.ibm.com,
catalin.marinas@arm.com
Cc: Oscar Salvador <osalvador@suse.de>,
Vasily Gorbik <gor@linux.ibm.com>, Will Deacon <will@kernel.org>,
Ard Biesheuvel <ardb@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH V3 2/3] arm64/mm: Define arch_get_mappable_range()
Date: Tue, 19 Jan 2021 13:24:48 +0100 [thread overview]
Message-ID: <6639d856-665c-7a60-884c-5771a8b805ba@redhat.com> (raw)
In-Reply-To: <1610975582-12646-3-git-send-email-anshuman.khandual@arm.com>
On 18.01.21 14:13, Anshuman Khandual wrote:
> 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 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;
>
>
Reviewed-by: David Hildenbrand <david@redhat.com>
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-01-19 12:25 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-18 13:12 [PATCH V3 0/3] mm/memory_hotplug: Pre-validate the address range with platform Anshuman Khandual
2021-01-18 13:12 ` [PATCH V3 1/3] mm/memory_hotplug: Prevalidate the address range being added " Anshuman Khandual
2021-01-19 12:21 ` David Hildenbrand
2021-01-20 8:33 ` Anshuman Khandual
2021-01-20 10:41 ` David Hildenbrand
2021-01-20 11:58 ` Oscar Salvador
2021-01-21 9:23 ` Oscar Salvador
2021-01-22 9:18 ` David Hildenbrand
2021-01-22 10:41 ` Anshuman Khandual
2021-01-22 10:42 ` David Hildenbrand
2021-01-22 10:43 ` David Hildenbrand
2021-01-18 13:13 ` [PATCH V3 2/3] arm64/mm: Define arch_get_mappable_range() Anshuman Khandual
2021-01-19 12:24 ` David Hildenbrand [this message]
2021-01-18 13:13 ` [PATCH V3 3/3] s390/mm: " Anshuman Khandual
2021-01-19 12:26 ` David Hildenbrand
2021-01-20 8:28 ` Anshuman Khandual
2021-01-20 10:39 ` David Hildenbrand
2021-01-18 13:13 ` [PATCH RFC] virtio-mem: check against memhp_get_pluggable_range() which memory we can hotplug Anshuman Khandual
2021-01-18 13:21 ` Anshuman Khandual
2021-01-19 12:27 ` David Hildenbrand
2021-01-21 9:57 ` David Hildenbrand
2021-01-22 3:32 ` Anshuman Khandual
2021-01-19 13:33 ` [PATCH V3 0/3] mm/memory_hotplug: Pre-validate the address range with platform David Hildenbrand
2021-01-19 13:40 ` Oscar Salvador
2021-01-20 8:37 ` Anshuman Khandual
2021-01-22 6:04 ` Anshuman Khandual
2021-01-22 8:34 ` David Hildenbrand
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