[PATCH 1/1] kexec: Use %pe format specifier for error pointer printing

[Zhu Yanjun]

Make pr_xxx() call to use the %pe format specifier instead of %d.
The %pe specifier prints a symbolic error string (e.g., -ENOMEM,
-EINVAL) when given an error pointer created with ERR_PTR(err).

This change enhances the clarity and diagnostic value of the error
message by showing a descriptive error name rather than a numeric
error code.

Signed-off-by: Zhu Yanjun <yanjun.zhu at linux.dev>
CC: graf at amazon.com
CC: rppt at kernel.org
CC: changyuanl at google.com
CC: akpm at linux-foundation.org
CC: bhe at redhat.com

---
 kernel/kexec_handover.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/kernel/kexec_handover.c b/kernel/kexec_handover.c
index 76f0940fb485..77af377022b0 100644
--- a/kernel/kexec_handover.c
+++ b/kernel/kexec_handover.c
@@ -1095,7 +1095,7 @@ static int kho_abort(void)
 	err = notifier_to_errno(err);
 
 	if (err)
-		pr_err("Failed to abort KHO finalization: %d\n", err);
+		pr_err("Failed to abort KHO finalization: %pe\n", ERR_PTR(err));
 
 	return err;
 }
@@ -1142,7 +1142,7 @@ static int kho_finalize(void)
 
 abort:
 	if (err) {
-		pr_err("Failed to convert KHO state tree: %d\n", err);
+		pr_err("Failed to convert KHO state tree: %pe\n", ERR_PTR(err));
 		kho_abort();
 	}
 
@@ -1355,8 +1355,8 @@ static __init int kho_in_debugfs_init(const void *fdt)
 		err = kho_debugfs_fdt_add(&kho_in.fdt_list, sub_fdt_dir, name,
 					  phys_to_virt(*fdt_phys));
 		if (err) {
-			pr_warn("failed to add fdt `%s` to debugfs: %d\n", name,
-				err);
+			pr_warn("failed to add fdt `%s` to debugfs: %pe\n", name,
+				ERR_PTR(err));
 			continue;
 		}
 	}
@@ -1400,8 +1400,8 @@ static __init int kho_init(void)
 		 * kexec.
 		 */
 		if (err)
-			pr_err("failed exposing handover FDT in debugfs: %d\n",
-			       err);
+			pr_err("failed exposing handover FDT in debugfs: %pe\n",
+			       ERR_PTR(err));
 
 		return 0;
 	}
@@ -1524,8 +1524,8 @@ void __init kho_populate(phys_addr_t fdt_phys, u64 fdt_len,
 		memblock_add(area->addr, size);
 		err = memblock_mark_kho_scratch(area->addr, size);
 		if (WARN_ON(err)) {
-			pr_warn("failed to mark the scratch region 0x%pa+0x%pa: %d",
-				&area->addr, &size, err);
+			pr_warn("failed to mark the scratch region 0x%pa+0x%pa: %pe",
+				&area->addr, &size, ERR_PTR(err));
 			goto out;
 		}
 		pr_debug("Marked 0x%pa+0x%pa as scratch", &area->addr, &size);
@@ -1553,7 +1553,7 @@ void __init kho_populate(phys_addr_t fdt_phys, u64 fdt_len,
 	if (scratch)
 		early_memunmap(scratch, scratch_len);
 	if (err)
-		pr_warn("disabling KHO revival: %d\n", err);
+		pr_warn("disabling KHO revival: %pe\n", ERR_PTR(err));
 }
 
 /* Helper functions for kexec_file_load */
-- 
2.51.0