From a9deb800b89efb2050453f7178e73b1d8b124e0f Mon Sep 17 00:00:00 2001 From: Kefeng Wang Date: Fri, 9 Jan 2026 17:31:32 +0800 Subject: mm: page_alloc: add __split_page() 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 Acked-by: David Hildenbrand Acked-by: Muchun Song Reviewed-by: Zi Yan Reviewed-by: Sidhartha Kumar Cc: Brendan Jackman Cc: Jane Chu Cc: Johannes Weiner Cc: Matthew Wilcox (Oracle) Cc: Oscar Salvador Cc: Vlastimil Babka Cc: Claudiu Beznea Cc: Mark Brown Signed-off-by: Andrew Morton --- include/linux/mmdebug.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include') diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h index 14a45979cccc..ab60ffba08f5 100644 --- a/include/linux/mmdebug.h +++ b/include/linux/mmdebug.h @@ -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) -- cgit v1.2.3