[PATCH v2] trusted-keys: move pr_fmt out of trusted-type.h

[Josh Snyder]

Defining pr_fmt in a widely-included header leaks the "trusted_key: "
prefix into every translation unit that transitively includes
<keys/trusted-type.h>. dm-crypt, for example, ends up printing

    trusted_key: device-mapper: crypt: dm-10: INTEGRITY AEAD ERROR ...

dm-crypt began including <keys/trusted-type.h> in commit 363880c4eb36
("dm crypt: support using trusted keys"), which predates the pr_fmt
addition, so the regression has been live from the moment the header
gained its own pr_fmt definition.

Move the pr_fmt definition into the trusted-keys source files that
actually want the prefix, with specific prefixes for each key type.

Fixes: 5d0682be3189 ("KEYS: trusted: Add generic trusted keys framework")
Assisted-by: Claude:claude-opus-4-6
Signed-off-by: Josh Snyder <josh at code406.com>
---
Changes in v2:
- specific pr_fmt based on trusted key type
---
 include/keys/trusted-type.h               | 6 ------
 security/keys/trusted-keys/trusted_caam.c | 2 ++
 security/keys/trusted-keys/trusted_core.c | 2 ++
 security/keys/trusted-keys/trusted_dcp.c  | 2 ++
 security/keys/trusted-keys/trusted_pkwm.c | 2 ++
 security/keys/trusted-keys/trusted_tpm1.c | 2 ++
 security/keys/trusted-keys/trusted_tpm2.c | 2 ++
 7 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/include/keys/trusted-type.h b/include/keys/trusted-type.h
index 03527162613f7..54da1f174aeab 100644
--- a/include/keys/trusted-type.h
+++ b/include/keys/trusted-type.h
@@ -11,12 +11,6 @@
 #include <linux/rcupdate.h>
 #include <linux/tpm.h>
 
-#ifdef pr_fmt
-#undef pr_fmt
-#endif
-
-#define pr_fmt(fmt) "trusted_key: " fmt
-
 #define MIN_KEY_SIZE			32
 #define MAX_KEY_SIZE			128
 #if IS_ENABLED(CONFIG_TRUSTED_KEYS_PKWM)
diff --git a/security/keys/trusted-keys/trusted_caam.c b/security/keys/trusted-keys/trusted_caam.c
index 601943ce0d60f..71c173bb2f727 100644
--- a/security/keys/trusted-keys/trusted_caam.c
+++ b/security/keys/trusted-keys/trusted_caam.c
@@ -4,6 +4,8 @@
  * Copyright 2025 NXP
  */
 
+#define pr_fmt(fmt) "trusted_key: caam: " fmt
+
 #include <keys/trusted_caam.h>
 #include <keys/trusted-type.h>
 #include <linux/build_bug.h>
diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
index 0b142d941cd2e..159af9dcfc774 100644
--- a/security/keys/trusted-keys/trusted_core.c
+++ b/security/keys/trusted-keys/trusted_core.c
@@ -6,6 +6,8 @@
  * See Documentation/security/keys/trusted-encrypted.rst
  */
 
+#define pr_fmt(fmt) "trusted_key: " fmt
+
 #include <keys/user-type.h>
 #include <keys/trusted-type.h>
 #include <keys/trusted_tee.h>
diff --git a/security/keys/trusted-keys/trusted_dcp.c b/security/keys/trusted-keys/trusted_dcp.c
index 7b6eb655df0cb..41a23e2f30891 100644
--- a/security/keys/trusted-keys/trusted_dcp.c
+++ b/security/keys/trusted-keys/trusted_dcp.c
@@ -3,6 +3,8 @@
  * Copyright (C) 2021 sigma star gmbh
  */
 
+#define pr_fmt(fmt) "trusted_key: dcp: " fmt
+
 #include <crypto/aead.h>
 #include <crypto/aes.h>
 #include <crypto/algapi.h>
diff --git a/security/keys/trusted-keys/trusted_pkwm.c b/security/keys/trusted-keys/trusted_pkwm.c
index bf42c6679245a..108db105b639f 100644
--- a/security/keys/trusted-keys/trusted_pkwm.c
+++ b/security/keys/trusted-keys/trusted_pkwm.c
@@ -3,6 +3,8 @@
  * Copyright (C) 2025 IBM Corporation, Srish Srinivasan <ssrish at linux.ibm.com>
  */
 
+#define pr_fmt(fmt) "trusted_key: pwkm: " fmt
+
 #include <keys/trusted_pkwm.h>
 #include <keys/trusted-type.h>
 #include <linux/build_bug.h>
diff --git a/security/keys/trusted-keys/trusted_tpm1.c b/security/keys/trusted-keys/trusted_tpm1.c
index 6ea728f1eae6f..207be849796ed 100644
--- a/security/keys/trusted-keys/trusted_tpm1.c
+++ b/security/keys/trusted-keys/trusted_tpm1.c
@@ -6,6 +6,8 @@
  * See Documentation/security/keys/trusted-encrypted.rst
  */
 
+#define pr_fmt(fmt) "trusted_key: tpm1: " fmt
+
 #include <crypto/hash_info.h>
 #include <crypto/sha1.h>
 #include <crypto/utils.h>
diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
index 6340823f8b53c..2a540b1af0b33 100644
--- a/security/keys/trusted-keys/trusted_tpm2.c
+++ b/security/keys/trusted-keys/trusted_tpm2.c
@@ -4,6 +4,8 @@
  * Copyright (C) 2014 Intel Corporation
  */
 
+#define pr_fmt(fmt) "trusted_key: tpm2: " fmt
+
 #include <linux/asn1_encoder.h>
 #include <linux/oid_registry.h>
 #include <linux/string.h>

---
base-commit: 66672af7a095d89f082c5327f3b15bc2f93d558e
change-id: 20260411-trusted-key-header-a544a4f149d2

Best regards,
--  
Josh