linux-kernel - [PATCH v2] target: iscsi: fix clang -Wformat warnings

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Date:   Mon, 18 Jul 2022 11:04:21 -0700
From:   Justin Stitt <justinstitt@...gle.com>
To:     justinstitt@...gle.com
Cc:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        llvm@...ts.linux.dev, martin.petersen@...cle.com,
        mgurtovoy@...dia.com, michael.christie@...cle.com,
        mingzhe.zou@...ystack.cn, nathan@...nel.org,
        ndesaulniers@...gle.com, target-devel@...r.kernel.org,
        trix@...hat.com
Subject: [PATCH v2] target: iscsi: fix clang -Wformat warnings

When building with Clang we encounter these warnings:
| drivers/target/iscsi/iscsi_target_login.c:719:24: error: format
| specifies type 'unsigned short' but the argument has type 'int'
| [-Werror,-Wformat] " from node: %s\n", atomic_read(&sess->nconn),
-
| drivers/target/iscsi/iscsi_target_login.c:767:12: error: format
| specifies type 'unsigned short' but the argument has type 'int'
| [-Werror,-Wformat] " %s\n", atomic_read(&sess->nconn),
-
| drivers/target/iscsi/iscsi_target.c:4365:12: error: format specifies
| type 'unsigned short' but the argument has type 'int' [-Werror,-Wformat]
| " %s\n", atomic_read(&sess->nconn)

For all warnings, the format specifier is `%hu` which describes an
unsigned short. The resulting type of atomic_read is an int. The
proposed fix is to listen to Clang and swap the format specifier.

Link: https://github.com/ClangBuiltLinux/linux/issues/378
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
diff from v1->v2:
Combined two similar patches into one:
* https://lore.kernel.org/all/20220708221314.466294-1-justinstitt@google.com/
* https://lore.kernel.org/llvm/20220708211447.135209-1-justinstitt@google.com/

 drivers/target/iscsi/iscsi_target.c       | 2 +-
 drivers/target/iscsi/iscsi_target_login.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index e368f038ff5c..bfb717065344 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -4361,7 +4361,7 @@ int iscsit_close_connection(
 
 	spin_lock_bh(&sess->conn_lock);
 	atomic_dec(&sess->nconn);
-	pr_debug("Decremented iSCSI connection count to %hu from node:"
+	pr_debug("Decremented iSCSI connection count to %d from node:"
 		" %s\n", atomic_read(&sess->nconn),
 		sess->sess_ops->InitiatorName);
 	/*
diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index 6b94eecc4790..0778591abae7 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -715,7 +715,7 @@ void iscsi_post_login_handler(
 
 		list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 		atomic_inc(&sess->nconn);
-		pr_debug("Incremented iSCSI Connection count to %hu"
+		pr_debug("Incremented iSCSI Connection count to %d"
 			" from node: %s\n", atomic_read(&sess->nconn),
 			sess->sess_ops->InitiatorName);
 		spin_unlock_bh(&sess->conn_lock);
@@ -763,7 +763,7 @@ void iscsi_post_login_handler(
 	spin_lock_bh(&sess->conn_lock);
 	list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 	atomic_inc(&sess->nconn);
-	pr_debug("Incremented iSCSI Connection count to %hu from node:"
+	pr_debug("Incremented iSCSI Connection count to %d from node:"
 		" %s\n", atomic_read(&sess->nconn),
 		sess->sess_ops->InitiatorName);
 	spin_unlock_bh(&sess->conn_lock);
-- 
2.37.0.170.g444d1eabd0-goog