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SubjectRe: [PATCH V5 3/4] s390/mm: Define arch_get_mappable_range()
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On 01.02.21 04:25, Anshuman Khandual wrote:
> This overrides arch_get_mappabble_range() on s390 platform which will be
> used with recently added generic framework. It modifies the existing range
> check in vmem_add_mapping() using arch_get_mappable_range(). It also adds a
> VM_BUG_ON() check that would ensure that mhp_range_allowed() has already
> been called on the hotplug path.
>
> Cc: Heiko Carstens <hca@linux.ibm.com>
> Cc: Vasily Gorbik <gor@linux.ibm.com>
> Cc: David Hildenbrand <david@redhat.com>
> Cc: linux-s390@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Acked-by: Heiko Carstens <hca@linux.ibm.com>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
> ---
> arch/s390/mm/init.c | 1 +
> arch/s390/mm/vmem.c | 14 +++++++++++++-
> 2 files changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
> index 73a163065b95..0e76b2127dc6 100644
> --- a/arch/s390/mm/init.c
> +++ b/arch/s390/mm/init.c
> @@ -297,6 +297,7 @@ int arch_add_memory(int nid, u64 start, u64 size,
> if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
> return -EINVAL;
>
> + VM_BUG_ON(!mhp_range_allowed(start, size, true));
> rc = vmem_add_mapping(start, size);
> if (rc)
> return rc;
> diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
> index 01f3a5f58e64..82dbf9450105 100644
> --- a/arch/s390/mm/vmem.c
> +++ b/arch/s390/mm/vmem.c
> @@ -4,6 +4,7 @@
> * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
> */
>
> +#include <linux/memory_hotplug.h>
> #include <linux/memblock.h>
> #include <linux/pfn.h>
> #include <linux/mm.h>
> @@ -532,11 +533,22 @@ void vmem_remove_mapping(unsigned long start, unsigned long size)
> mutex_unlock(&vmem_mutex);
> }
>
> +struct range arch_get_mappable_range(void)
> +{
> + struct range mhp_range;
> +
> + mhp_range.start = 0;
> + mhp_range.end = VMEM_MAX_PHYS - 1;
> + return mhp_range;
> +}
> +
> int vmem_add_mapping(unsigned long start, unsigned long size)
> {
> + struct range range = arch_get_mappable_range();
> int ret;
>
> - if (start + size > VMEM_MAX_PHYS ||
> + if (start < range.start ||
> + start + size > range.end + 1 ||
> start + size < start)
> return -ERANGE;
>
>

Reviewed-by: David Hildenbrand <david@redhat.com>

--
Thanks,

David / dhildenb

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