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| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2023-08-08 11:14:58 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-21 22:37:48 +0200 |
| commit | 85a2b4b08f202d67be81e2453064e01572ec19c8 (patch) | |
| tree | 52a211da068b0092b026a54cfba4f15f5f29dd6e /mm/memory_hotplug.c | |
| parent | mm/memory_hotplug: allow memmap on memory hotplug request to fallback (diff) | |
| download | linux-85a2b4b08f202d67be81e2453064e01572ec19c8.tar.xz linux-85a2b4b08f202d67be81e2453064e01572ec19c8.zip | |
mm/memory_hotplug: allow architecture to override memmap on memory support check
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>
Diffstat (limited to 'mm/memory_hotplug.c')
| -rw-r--r-- | mm/memory_hotplug.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index eca32ccd45cc..746cb7c08c64 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -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); } /* |