mm: cma: kill cma_pages_valid()

Kill cma_pages_valid() which only used in cma_release(), also cleanup code
duplication between cma pages valid checking and cma memrange finding.

Link: https://lkml.kernel.org/r/20260109093136.1491549-4-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
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>

2 files changed, 11 insertions, 38 deletions

diff --git a/include/linux/cma.h b/include/linux/cma.h
index 62d9c1cf6326..e5745d2aec55 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -49,7 +49,6 @@ extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
 					struct cma **res_cma);
 extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
 			      bool no_warn);
-extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count);
 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
 
 extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
diff --git a/mm/cma.c b/mm/cma.c
index 813e6dc7b095..fe3a9eaac4e5 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -942,36 +942,6 @@ struct folio *cma_alloc_folio(struct cma *cma, int order, gfp_t gfp)
 	return page ? page_folio(page) : NULL;
 }
 
-bool cma_pages_valid(struct cma *cma, const struct page *pages,
-		     unsigned long count)
-{
-	unsigned long pfn, end;
-	int r;
-	struct cma_memrange *cmr;
-	bool ret;
-
-	if (!cma || !pages || count > cma->count)
-		return false;
-
-	pfn = page_to_pfn(pages);
-	ret = false;
-
-	for (r = 0; r < cma->nranges; r++) {
-		cmr = &cma->ranges[r];
-		end = cmr->base_pfn + cmr->count;
-		if (pfn >= cmr->base_pfn && pfn < end) {
-			ret = pfn + count <= end;
-			break;
-		}
-	}
-
-	if (!ret)
-		pr_debug("%s(page %p, count %lu)\n",
-				__func__, (void *)pages, count);
-
-	return ret;
-}
-
 /**
  * cma_release() - release allocated pages
  * @cma:   Contiguous memory region for which the allocation is performed.
@@ -991,23 +961,27 @@ bool cma_release(struct cma *cma, const struct page *pages,
 
 	pr_debug("%s(page %p, count %lu)\n", __func__, (void *)pages, count);
 
-	if (!cma_pages_valid(cma, pages, count))
+	if (!cma || !pages || count > cma->count)
 		return false;
 
 	pfn = page_to_pfn(pages);
-	end_pfn = pfn + count;
 
 	for (r = 0; r < cma->nranges; r++) {
 		cmr = &cma->ranges[r];
-		if (pfn >= cmr->base_pfn &&
-		    pfn < (cmr->base_pfn + cmr->count)) {
-			VM_BUG_ON(end_pfn > cmr->base_pfn + cmr->count);
-			break;
+		end_pfn = cmr->base_pfn + cmr->count;
+		if (pfn >= cmr->base_pfn && pfn < end_pfn) {
+			if (pfn + count <= end_pfn)
+				break;
+
+			VM_WARN_ON_ONCE(1);
 		}
 	}
 
-	if (r == cma->nranges)
+	if (r == cma->nranges) {
+		pr_debug("%s(page %p, count %lu, no cma range matches the page range)\n",
+			 __func__, (void *)pages, count);
 		return false;
+	}
 
 	free_contig_range(pfn, count);
 	cma_clear_bitmap(cma, cmr, pfn, count);