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mm/memory_hotplug: allow architecture to override memmap on memory support check

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Some architectures would want different restrictions. Hence add an
architecture-specific override.

The PMD_SIZE check is moved there.

Link: https://lkml.kernel.org/r/20230808091501.287660-4-aneesh.kumar@linux.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Aneesh Kumar K.V 2023-08-08 14:44:58 +05:30 committed by Andrew Morton
parent e3c2bfdd33
commit 85a2b4b08f
1 changed files with 20 additions and 4 deletions
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24
mm/memory_hotplug.c
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@ -1247,10 +1247,26 @@ static int online_memory_block(struct memory_block *mem, void *arg)
return device_online(&mem->dev);
}
static inline unsigned long memory_block_memmap_size(void)
{
return PHYS_PFN(memory_block_size_bytes()) * sizeof(struct page);
}
#ifndef arch_supports_memmap_on_memory
static inline bool arch_supports_memmap_on_memory(unsigned long vmemmap_size)
{
/*
* As default, we want the vmemmap to span a complete PMD such that we
* can map the vmemmap using a single PMD if supported by the
* architecture.
*/
return IS_ALIGNED(vmemmap_size, PMD_SIZE);
}
#endif
static bool mhp_supports_memmap_on_memory(unsigned long size)
{
unsigned long nr_vmemmap_pages = size / PAGE_SIZE;
unsigned long vmemmap_size = nr_vmemmap_pages * sizeof(struct page);
unsigned long vmemmap_size = memory_block_memmap_size();
unsigned long remaining_size = size - vmemmap_size;
/*
@ -1281,8 +1297,8 @@ static bool mhp_supports_memmap_on_memory(unsigned long size)
*/
return mhp_memmap_on_memory() &&
size == memory_block_size_bytes() &&
IS_ALIGNED(vmemmap_size, PMD_SIZE) &&
IS_ALIGNED(remaining_size, (pageblock_nr_pages << PAGE_SHIFT));
IS_ALIGNED(remaining_size, (pageblock_nr_pages << PAGE_SHIFT)) &&
arch_supports_memmap_on_memory(vmemmap_size);
}
/*