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* [PATCH] mm: use proper type for cma_[alloc|release]
@ 2021-03-31 16:40 Minchan Kim
  2021-03-31 17:34 ` David Hildenbrand
  0 siblings, 1 reply; 2+ messages in thread
From: Minchan Kim @ 2021-03-31 16:40 UTC (permalink / raw)
  To: Andrew Morton
  Cc: linux-mm, LKML, joaodias, Minchan Kim, Matthew Wilcox, David Hildenbrand

size_t in cma_alloc is confusing since it makes people think
it's byte count, not pages. Change it to unsigned long[1].

The unsigned int in cma_release is also not right so change it.
Since we have unsigned long in cma_release, free_contig_range
should also respect it.

[1] 67a2e213e7e9, mm: cma: fix incorrect type conversion for size during dma allocation
Link: https://lore.kernel.org/linux-mm/20210324043434.GP1719932@casper.infradead.org/
Cc: Matthew Wilcox <willy@infradead.org>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
---
 include/linux/cma.h        |  4 ++--
 include/linux/gfp.h        |  2 +-
 include/trace/events/cma.h | 22 +++++++++++-----------
 mm/cma.c                   | 17 +++++++++--------
 mm/page_alloc.c            |  6 +++---
 5 files changed, 26 insertions(+), 25 deletions(-)

diff --git a/include/linux/cma.h b/include/linux/cma.h
index 217999c8a762..53fd8c3cdbd0 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -44,9 +44,9 @@ extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
 					unsigned int order_per_bit,
 					const char *name,
 					struct cma **res_cma);
-extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
+extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
 			      bool no_warn);
-extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int 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);
 #endif
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 0a88f84b08f4..529c27c6cb15 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -639,7 +639,7 @@ extern int alloc_contig_range(unsigned long start, unsigned long end,
 extern struct page *alloc_contig_pages(unsigned long nr_pages, gfp_t gfp_mask,
 				       int nid, nodemask_t *nodemask);
 #endif
-void free_contig_range(unsigned long pfn, unsigned int nr_pages);
+void free_contig_range(unsigned long pfn, unsigned long nr_pages);
 
 #ifdef CONFIG_CMA
 /* CMA stuff */
diff --git a/include/trace/events/cma.h b/include/trace/events/cma.h
index 5cf385ae7c08..c3d354702cb0 100644
--- a/include/trace/events/cma.h
+++ b/include/trace/events/cma.h
@@ -11,7 +11,7 @@
 DECLARE_EVENT_CLASS(cma_alloc_class,
 
 	TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
-		 unsigned int count, unsigned int align),
+		 unsigned long count, unsigned int align),
 
 	TP_ARGS(name, pfn, page, count, align),
 
@@ -19,7 +19,7 @@ DECLARE_EVENT_CLASS(cma_alloc_class,
 		__string(name, name)
 		__field(unsigned long, pfn)
 		__field(const struct page *, page)
-		__field(unsigned int, count)
+		__field(unsigned long, count)
 		__field(unsigned int, align)
 	),
 
@@ -31,7 +31,7 @@ DECLARE_EVENT_CLASS(cma_alloc_class,
 		__entry->align = align;
 	),
 
-	TP_printk("name=%s pfn=%lx page=%p count=%u align=%u",
+	TP_printk("name=%s pfn=%lx page=%p count=%lu align=%u",
 		  __get_str(name),
 		  __entry->pfn,
 		  __entry->page,
@@ -42,7 +42,7 @@ DECLARE_EVENT_CLASS(cma_alloc_class,
 TRACE_EVENT(cma_release,
 
 	TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
-		 unsigned int count),
+		 unsigned long count),
 
 	TP_ARGS(name, pfn, page, count),
 
@@ -50,7 +50,7 @@ TRACE_EVENT(cma_release,
 		__string(name, name)
 		__field(unsigned long, pfn)
 		__field(const struct page *, page)
-		__field(unsigned int, count)
+		__field(unsigned long, count)
 	),
 
 	TP_fast_assign(
@@ -60,7 +60,7 @@ TRACE_EVENT(cma_release,
 		__entry->count = count;
 	),
 
-	TP_printk("name=%s pfn=%lx page=%p count=%u",
+	TP_printk("name=%s pfn=%lx page=%p count=%lu",
 		  __get_str(name),
 		  __entry->pfn,
 		  __entry->page,
@@ -69,13 +69,13 @@ TRACE_EVENT(cma_release,
 
 TRACE_EVENT(cma_alloc_start,
 
-	TP_PROTO(const char *name, unsigned int count, unsigned int align),
+	TP_PROTO(const char *name, unsigned long count, unsigned int align),
 
 	TP_ARGS(name, count, align),
 
 	TP_STRUCT__entry(
 		__string(name, name)
-		__field(unsigned int, count)
+		__field(unsigned long, count)
 		__field(unsigned int, align)
 	),
 
@@ -85,7 +85,7 @@ TRACE_EVENT(cma_alloc_start,
 		__entry->align = align;
 	),
 
-	TP_printk("name=%s count=%u align=%u",
+	TP_printk("name=%s count=%lu align=%u",
 		  __get_str(name),
 		  __entry->count,
 		  __entry->align)
@@ -94,7 +94,7 @@ TRACE_EVENT(cma_alloc_start,
 DEFINE_EVENT(cma_alloc_class, cma_alloc_finish,
 
 	TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
-		 unsigned int count, unsigned int align),
+		 unsigned long count, unsigned int align),
 
 	TP_ARGS(name, pfn, page, count, align)
 );
@@ -102,7 +102,7 @@ DEFINE_EVENT(cma_alloc_class, cma_alloc_finish,
 DEFINE_EVENT(cma_alloc_class, cma_alloc_busy_retry,
 
 	TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
-		 unsigned int count, unsigned int align),
+		 unsigned long count, unsigned int align),
 
 	TP_ARGS(name, pfn, page, count, align)
 );
diff --git a/mm/cma.c b/mm/cma.c
index de6b9f01be53..f3bca4178c7f 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -80,7 +80,7 @@ static unsigned long cma_bitmap_pages_to_bits(const struct cma *cma,
 }
 
 static void cma_clear_bitmap(struct cma *cma, unsigned long pfn,
-			     unsigned int count)
+			     unsigned long count)
 {
 	unsigned long bitmap_no, bitmap_count;
 
@@ -423,21 +423,21 @@ static inline void cma_debug_show_areas(struct cma *cma) { }
  * This function allocates part of contiguous memory on specific
  * contiguous memory area.
  */
-struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
-		       bool no_warn)
+struct page *cma_alloc(struct cma *cma, unsigned long count,
+		       unsigned int align, bool no_warn)
 {
 	unsigned long mask, offset;
 	unsigned long pfn = -1;
 	unsigned long start = 0;
 	unsigned long bitmap_maxno, bitmap_no, bitmap_count;
-	size_t i;
+	unsigned long i;
 	struct page *page = NULL;
 	int ret = -ENOMEM;
 
 	if (!cma || !cma->count || !cma->bitmap)
 		goto out;
 
-	pr_debug("%s(cma %p, count %zu, align %d)\n", __func__, (void *)cma,
+	pr_debug("%s(cma %p, count %lu, align %d)\n", __func__, (void *)cma,
 		 count, align);
 
 	if (!count)
@@ -505,7 +505,7 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
 	}
 
 	if (ret && !no_warn) {
-		pr_err_ratelimited("%s: %s: alloc failed, req-size: %zu pages, ret: %d\n",
+		pr_err_ratelimited("%s: %s: alloc failed, req-size: %lu pages, ret: %d\n",
 				   __func__, cma->name, count, ret);
 		cma_debug_show_areas(cma);
 	}
@@ -534,14 +534,15 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
  * It returns false when provided pages do not belong to contiguous area and
  * true otherwise.
  */
-bool cma_release(struct cma *cma, const struct page *pages, unsigned int count)
+bool cma_release(struct cma *cma, const struct page *pages,
+		 unsigned long count)
 {
 	unsigned long pfn;
 
 	if (!cma || !pages)
 		return false;
 
-	pr_debug("%s(page %p, count %u)\n", __func__, (void *)pages, count);
+	pr_debug("%s(page %p, count %lu)\n", __func__, (void *)pages, count);
 
 	pfn = page_to_pfn(pages);
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c53fe4fa10bf..21540fb29b0d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8817,9 +8817,9 @@ struct page *alloc_contig_pages(unsigned long nr_pages, gfp_t gfp_mask,
 }
 #endif /* CONFIG_CONTIG_ALLOC */
 
-void free_contig_range(unsigned long pfn, unsigned int nr_pages)
+void free_contig_range(unsigned long pfn, unsigned long nr_pages)
 {
-	unsigned int count = 0;
+	unsigned long count = 0;
 
 	for (; nr_pages--; pfn++) {
 		struct page *page = pfn_to_page(pfn);
@@ -8827,7 +8827,7 @@ void free_contig_range(unsigned long pfn, unsigned int nr_pages)
 		count += page_count(page) != 1;
 		__free_page(page);
 	}
-	WARN(count != 0, "%d pages are still in use!\n", count);
+	WARN(count != 0, "%lu pages are still in use!\n", count);
 }
 EXPORT_SYMBOL(free_contig_range);
 
-- 
2.31.0.208.g409f899ff0-goog


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2021-03-31 16:40 [PATCH] mm: use proper type for cma_[alloc|release] Minchan Kim
2021-03-31 17:34 ` David Hildenbrand

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