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SubjectRe: [PATCH V2 3/3] s390/mm: Define arch_get_mappable_range()
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On 1/11/21 4:10 PM, David Hildenbrand wrote:
> On 17.12.20 16:28, 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 memhp_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 | 15 ++++++++++++++-
>> 2 files changed, 15 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
>> index 77767850d0d0..e0e78234ae57 100644
>> --- a/arch/s390/mm/init.c
>> +++ b/arch/s390/mm/init.c
>> @@ -291,6 +291,7 @@ 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(!memhp_range_allowed(start, size, 1));
>
> s/1/true/

Sure, will do.

>
>> 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 b239f2ba93b0..e10e563ad2b4 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 +533,23 @@ void vmem_remove_mapping(unsigned long start, unsigned long size)
>> mutex_unlock(&vmem_mutex);
>> }
>>
>> +struct range arch_get_mappable_range(void)
>> +{
>> + struct range memhp_range;
>> +
>> + memhp_range.start = 0;
>> + memhp_range.end = VMEM_MAX_PHYS;
>
> s/ / /
>
> IIRC, the range is inclusive? "VMEM_MAX_PHYS - 1" then, and adjust the
> check below.

Right, the memory range is inclusive at both ends. Hence will update the
code here.

diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 21cabe3473d7..afc39ff1cc8d 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -538,7 +538,7 @@ struct range arch_get_mappable_range(void)
struct range memhp_range;

memhp_range.start = 0;
- memhp_range.end = VMEM_MAX_PHYS;
+ memhp_range.end = VMEM_MAX_PHYS - 1;
return memhp_range;
}

@@ -549,7 +549,7 @@ int vmem_add_mapping(unsigned long start, unsigned long size)

range = arch_get_mappable_range();
if (start < range.start ||
- start + size > range.end ||
+ start + size > range.end + 1 ||
start + size < start)
return -ERANGE;

(start + size - 1) is valid only when it is upto the inclusive range.end value.
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