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mm: page_alloc: add __split_page()

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Factor out the splitting of non-compound page from make_alloc_exact() and
split_page() into a new helper function __split_page().

While at it, convert the VM_BUG_ON_PAGE() into a VM_WARN_ON_PAGE().

Link: https://lkml.kernel.org/r/20260109093136.1491549-3-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Muchun Song <muchun.song@linux.dev>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kefeng Wang
2026-01-09 17:31:32 +08:00
committed by Andrew Morton
parent 01152bd2e4
commit a9deb800b8
2 changed files with 23 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
include/linux/mmdebug.h
View File

@@ -47,6 +47,15 @@ void vma_iter_dump_tree(const struct vma_iterator *vmi);
BUG(); \
} \
} while (0)
#define VM_WARN_ON_PAGE(cond, page) ({ \
int __ret_warn = !!(cond); \
\
if (unlikely(__ret_warn)) { \
dump_page(page, "VM_WARN_ON_PAGE(" __stringify(cond)")");\
WARN_ON(1); \
} \
unlikely(__ret_warn); \
})
#define VM_WARN_ON_ONCE_PAGE(cond, page) ({ \
static bool __section(".data..once") __warned; \
int __ret_warn_once = !!(cond); \
@@ -122,6 +131,7 @@ void vma_iter_dump_tree(const struct vma_iterator *vmi);
#define VM_BUG_ON_MM(cond, mm) VM_BUG_ON(cond)
#define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_PAGE(cond, page) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_ONCE_PAGE(cond, page) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_FOLIO(cond, folio) BUILD_BUG_ON_INVALID(cond)
#define VM_WARN_ON_ONCE_FOLIO(cond, folio) BUILD_BUG_ON_INVALID(cond)

21
mm/page_alloc.c
View File

@@ -3107,6 +3107,15 @@ void free_unref_folios(struct folio_batch *folios)
folio_batch_reinit(folios);
}
static void __split_page(struct page *page, unsigned int order)
{
VM_WARN_ON_PAGE(PageCompound(page), page);
split_page_owner(page, order, 0);
pgalloc_tag_split(page_folio(page), order, 0);
split_page_memcg(page, order);
}
/*
* split_page takes a non-compound higher-order page, and splits it into
* n (1<<order) sub-pages: page[0..n]
@@ -3119,14 +3128,12 @@ void split_page(struct page *page, unsigned int order)
{
int i;
VM_BUG_ON_PAGE(PageCompound(page), page);
VM_BUG_ON_PAGE(!page_count(page), page);
VM_WARN_ON_PAGE(!page_count(page), page);
for (i = 1; i < (1 << order); i++)
set_page_refcounted(page + i);
split_page_owner(page, order, 0);
pgalloc_tag_split(page_folio(page), order, 0);
split_page_memcg(page, order);
__split_page(page, order);
}
EXPORT_SYMBOL_GPL(split_page);
@@ -5389,9 +5396,7 @@ static void *make_alloc_exact(unsigned long addr, unsigned int order,
struct page *page = virt_to_page((void *)addr);
struct page *last = page + nr;
split_page_owner(page, order, 0);
pgalloc_tag_split(page_folio(page), order, 0);
split_page_memcg(page, order);
__split_page(page, order);
while (page < --last)
set_page_refcounted(last);