On 06/23/2016 12:17 PM, Aneesh Kumar K.V wrote:
> Reza Arbab <ar...@linux.vnet.ibm.com> writes:
>
>> These functions are making direct calls to the hash table APIs,
>> leading to a BUG() on systems using radix.
>>
>> Switch them to the vmemmap_{create,remove}_mapping() wrappers, and
>> move to the __meminit section.
>
>
> They are really not the same. They can possibly end up using different
> base page size. Also vmemmap is available only with SPARSEMEM_VMEMMAP
> enabled. Does hotplug depend on sparsemem vmemmap ?
Sparse vmemmap is supported, and I think enabled by default for pseries,
but hotplug does not depend on sparse vmemmep.
-Nathan
>
>>
>> Signed-off-by: Reza Arbab <ar...@linux.vnet.ibm.com>
>> ---
>> arch/powerpc/mm/mem.c | 8 ++++----
>> 1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
>> index 2fd57fa..80c6ee7 100644
>> --- a/arch/powerpc/mm/mem.c
>> +++ b/arch/powerpc/mm/mem.c
>> @@ -116,7 +116,7 @@ int memory_add_physaddr_to_nid(u64 start)
>> }
>> #endif
>>
>> -int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
>> +int __meminit arch_add_memory(int nid, u64 start, u64 size, bool for_device)
>> {
>> struct pglist_data *pgdata;
>> struct zone *zone;
>> @@ -127,7 +127,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool
>> for_device)
>> pgdata = NODE_DATA(nid);
>>
>> start = (unsigned long)__va(start);
>> - rc = create_section_mapping(start, start + size);
>> + rc = vmemmap_create_mapping(start, size, __pa(start));
>> if (rc) {
>> pr_warning(
>> "Unable to create mapping for hot added memory
>> 0x%llx..0x%llx: %d\n",
>> @@ -143,7 +143,7 @@ int arch_add_memory(int nid, u64 start, u64 size, bool
>> for_device)
>> }
>>
>> #ifdef CONFIG_MEMORY_HOTREMOVE
>> -int arch_remove_memory(u64 start, u64 size)
>> +int __meminit arch_remove_memory(u64 start, u64 size)
>> {
>> unsigned long start_pfn = start >> PAGE_SHIFT;
>> unsigned long nr_pages = size >> PAGE_SHIFT;
>> @@ -157,7 +157,7 @@ int arch_remove_memory(u64 start, u64 size)
>>
>> /* Remove htab bolted mappings for this section of memory */
>> start = (unsigned long)__va(start);
>> - ret = remove_section_mapping(start, start + size);
>> + vmemmap_remove_mapping(start, size);
>>
>> /* Ensure all vmalloc mappings are flushed in case they also
>> * hit that section of memory
>> --
>> 1.8.3.1
>
> We really want to look at memory hotplug to fully understand the
> radix impact. The unplug operation needs to do some additional freeing.
>
> I did put in comments around that with the idea of coming back to that
> later
>
> #ifdef CONFIG_MEMORY_HOTPLUG
> void radix__vmemmap_remove_mapping(unsigned long start, unsigned long
> page_size)
> {
> /* FIXME!! intel does more. We should free page tables mapping vmemmap
> ? */
> }
> #endif
>
> -aneesh
>
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev
>
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/linuxppc-dev
