[PATCH] mm: Use %pe format specifier for error pointers

[PATCH] mm: Use %pe format specifier for error pointers

[zenghongling]

Convert error logging throughout the MM subsystem to use
the %pe format specifier instead of PTR_ERR() with integer
format specifiers.

Found by:
----
./zswap.c:753:20-27: WARNING: Consider using %pe to print PTR_ERR()
./vmscan.c:7504:12-19: WARNING: Consider using %pe to print PTR_ERR()
---

Signed-off-by: zenghongling <zenghongling@kylinos.cn>
---
 mm/vmscan.c | 4 ++--
 mm/zswap.c  | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index b2fc8b626d3d..29ed0b304b5c 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -7500,8 +7500,8 @@ void __meminit kswapd_run(int nid)
 		pgdat->kswapd = kthread_create_on_node(kswapd, pgdat, nid, "kswapd%d", nid);
 		if (IS_ERR(pgdat->kswapd)) {
 			/* failure at boot is fatal */
-			pr_err("Failed to start kswapd on node %d，ret=%ld\n",
-				   nid, PTR_ERR(pgdat->kswapd));
+			pr_err("Failed to start kswapd on node %d, ret=%pe\n",
+				   nid, pgdat->kswapd);
 			BUG_ON(system_state < SYSTEM_RUNNING);
 			pgdat->kswapd = NULL;
 		} else {
diff --git a/mm/zswap.c b/mm/zswap.c
index c1af782e54ec..c35604db32ad 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -749,8 +749,8 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, struct hlist_node *node)
 
 	acomp = crypto_alloc_acomp_node(pool->tfm_name, 0, 0, cpu_to_node(cpu));
 	if (IS_ERR(acomp)) {
-		pr_err("could not alloc crypto acomp %s : %ld\n",
-				pool->tfm_name, PTR_ERR(acomp));
+		pr_err("could not alloc crypto acomp %s : %pe\n",
+				pool->tfm_name, acomp);
 		ret = PTR_ERR(acomp);
 		goto fail;
 	}
-- 
2.25.1

Re: [PATCH] mm: Use %pe format specifier for error pointers

[Matthew Wilcox]

On Wed, Jan 21, 2026 at 11:48:17AM +0800, zenghongling wrote:
> Convert error logging throughout the MM subsystem to use
> the %pe format specifier instead of PTR_ERR() with integer
> format specifiers.
> 
> Found by:
> ----
> ./zswap.c:753:20-27: WARNING: Consider using %pe to print PTR_ERR()
> ./vmscan.c:7504:12-19: WARNING: Consider using %pe to print PTR_ERR()

Please stop.