The patch titled
Subject: mm/memory_hotplug: allow architecture to override memmap on memory support check
has been added to the -mm mm-unstable branch. Its filename is
mm-memory_hotplug-allow-architecture-to-override-memmap-on-memory-support-check.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memory_hotplug-allow-architecture-to-override-memmap-on-memory-support-check.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>
Subject: mm/memory_hotplug: allow architecture to override memmap on memory support check
Date: Tue, 8 Aug 2023 14:44:58 +0530
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@xxxxxxxxxxxxx
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory_hotplug.c | 24 ++++++++++++++++++++----
1 file changed, 20 insertions(+), 4 deletions(-)
--- a/mm/memory_hotplug.c~mm-memory_hotplug-allow-architecture-to-override-memmap-on-memory-support-check
+++ a/mm/memory_hotplug.c
@@ -1247,10 +1247,26 @@ static int online_memory_block(struct me
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_memor
*/
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);
}
/*
_
Patches currently in -mm which might be from aneesh.kumar@xxxxxxxxxxxxx are
mm-hugepage-pud-allow-arch-specific-helper-function-to-check-huge-page-pud-support.patch
mm-hugepage-pud-allow-arch-specific-helper-function-to-check-huge-page-pud-support-fix.patch
mm-change-pudp_huge_get_and_clear_full-take-vm_area_struct-as-arg.patch
mm-vmemmap-improve-vmemmap_can_optimize-and-allow-architectures-to-override.patch
mm-vmemmap-allow-architectures-to-override-how-vmemmap-optimization-works.patch
mm-add-pud_same-similar-to-__have_arch_p4d_same.patch
mm-huge-pud-use-transparent-huge-pud-helpers-only-with-config_transparent_hugepage.patch
mm-vmemmap-optimization-split-hugetlb-and-devdax-vmemmap-optimization.patch
powerpc-mm-trace-convert-trace-event-to-trace-event-class.patch
powerpc-book3s64-mm-enable-transparent-pud-hugepage.patch
powerpc-book3s64-vmemmap-switch-radix-to-use-a-different-vmemmap-handling-function.patch
powerpc-book3s64-vmemmap-switch-radix-to-use-a-different-vmemmap-handling-function-fix.patch
powerpc-book3s64-vmemmap-switch-radix-to-use-a-different-vmemmap-handling-function-fix-2.patch
powerpc-book3s64-radix-add-support-for-vmemmap-optimization-for-radix.patch
powerpc-book3s64-radix-add-support-for-vmemmap-optimization-for-radix-fix.patch
powerpc-book3s64-radix-remove-mmu_vmemmap_psize.patch
powerpc-book3s64-radix-remove-mmu_vmemmap_psize-fix.patch
powerpc-book3s64-radix-add-debug-message-to-give-more-details-of-vmemmap-allocation.patch
mm-memory_hotplug-simplify-arch_mhp_memmap_on_memory_enable-kconfig.patch
mm-memory_hotplug-allow-memmap-on-memory-hotplug-request-to-fallback.patch
mm-memory_hotplug-allow-architecture-to-override-memmap-on-memory-support-check.patch
mm-memory_hotplug-support-memmap_on_memory-when-memmap-is-not-aligned-to-pageblocks.patch
powerpc-book3s64-memhotplug-enable-memmap-on-memory-for-radix.patch
mm-memory_hotplug-embed-vmem_altmap-details-in-memory-block.patch
