linux-kernel - [PATCH] mm: change size_t to unsigned int for cma

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Message-Id: <20210329182553.3129234-1-minchan@kernel.org>
Date:   Mon, 29 Mar 2021 11:25:53 -0700
From:   Minchan Kim <minchan@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        Minchan Kim <minchan@...nel.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: [PATCH] mm: change size_t to unsigned int for cma_alloc

size_t in cma_alloc is confusing since it makes people think
it's byte count, not pages. Fix it.

Link: https://lore.kernel.org/linux-mm/20210324043434.GP1719932@casper.infradead.org/
Cc: Matthew Wilcox <willy@...radead.org>
Signed-off-by: Minchan Kim <minchan@...nel.org>
---
 include/linux/cma.h | 2 +-
 mm/cma.c            | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/linux/cma.h b/include/linux/cma.h
index 217999c8a762..a873edc20ca2 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -44,7 +44,7 @@ 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 int count, unsigned int align,
 			      bool no_warn);
 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
 
diff --git a/mm/cma.c b/mm/cma.c
index 08c45157911a..24dc01e26d45 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -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,
+struct page *cma_alloc(struct cma *cma, unsigned int 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 int 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 %u, align %d)\n", __func__, (void *)cma,
 		 count, align);
 
 	if (!count)
@@ -500,7 +500,7 @@ 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: %u pages, ret: %d\n",
 				   __func__, cma->name, count, ret);
 		cma_debug_show_areas(cma);
 	}
-- 
2.31.0.291.g576ba9dcdaf-goog