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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
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10
include/linux/mmdebug.h
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@@ -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)