linux-kernel - [PATCH v1 1/8] drm/etnaviv: Using the size_t variable to store the number of pages

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Date:   Fri, 23 Jun 2023 18:08:15 +0800
From:   Sui Jingfeng <sui.jingfeng@...ux.dev>
To:     Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     etnaviv@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn,
        Sui Jingfeng <suijingfeng@...ngson.cn>
Subject: [PATCH v1 1/8] drm/etnaviv: Using the size_t variable to store the number of pages

From: Sui Jingfeng <suijingfeng@...ngson.cn>

Because the etnaviv_gem_new_private() function receives the size_t argument
for the number of pages. And the number of pages should be unsigned.

Note that Most 32-bit architectures use "unsigned int" size_t,
and all 64-bit architectures use "unsigned long" size_t.
So, let's keep the argument and parameter consistent.

Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
---
 drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
index 3524b5811682..b003481adc2b 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
@@ -114,7 +114,8 @@ struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev,
 {
 	struct etnaviv_gem_object *etnaviv_obj;
 	size_t size = PAGE_ALIGN(attach->dmabuf->size);
-	int ret, npages;
+	size_t npages = size / PAGE_SIZE;
+	int ret;
 
 	ret = etnaviv_gem_new_private(dev, size, ETNA_BO_WC,
 				      &etnaviv_gem_prime_ops, &etnaviv_obj);
@@ -123,8 +124,6 @@ struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev,
 
 	lockdep_set_class(&etnaviv_obj->lock, &etnaviv_prime_lock_class);
 
-	npages = size / PAGE_SIZE;
-
 	etnaviv_obj->sgt = sgt;
 	etnaviv_obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 	if (!etnaviv_obj->pages) {
-- 
2.25.1