linux-kernel - [PATCH] nfp: fix clang -Wformat warnings

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Message-Id: <20220712000152.2292031-1-justinstitt@google.com>
Date:   Mon, 11 Jul 2022 17:01:52 -0700
From:   Justin Stitt <justinstitt@...gle.com>
To:     Simon Horman <simon.horman@...igine.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Justin Stitt <justinstitt@...gle.com>,
        Fei Qin <fei.qin@...igine.com>, Yu Xiao <yu.xiao@...igine.com>,
        Yinjun Zhang <yinjun.zhang@...igine.com>,
        Dirk van der Merwe <dirk.vandermerwe@...ronome.com>,
        Leon Romanovsky <leon@...nel.org>, oss-drivers@...igine.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: [PATCH] nfp: fix clang -Wformat warnings

When building with Clang we encounter these warnings:
| drivers/net/ethernet/netronome/nfp/nfp_app.c:233:99: error: format
| specifies type 'unsigned char' but the argument has underlying type
| 'unsigned int' [-Werror,-Wformat] nfp_err(pf->cpp, "unknown FW app ID
| 0x%02hhx, driver too old or support for FW not built in\n", id);
-
| drivers/net/ethernet/netronome/nfp/nfp_main.c:396:11: error: format
| specifies type 'unsigned char' but the argument has type 'int'
| [-Werror,-Wformat] serial, interface >> 8, interface & 0xff);

Correct format specifier for `id` is `%x` since the default type for the
`nfp_app_id` enum is `unsigned int`. The second warning is also solved
by using the `%x` format specifier as the expressions involving
`interface` are implicity promoted to integers (%x is used to maintain
hexadecimal representation).

Link: https://github.com/ClangBuiltLinux/linux/issues/378
Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_app.c  | 2 +-
 drivers/net/ethernet/netronome/nfp/nfp_main.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_app.c b/drivers/net/ethernet/netronome/nfp/nfp_app.c
index 09f250e74dfa..bb3f46c74f77 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_app.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_app.c
@@ -230,7 +230,7 @@ struct nfp_app *nfp_app_alloc(struct nfp_pf *pf, enum nfp_app_id id)
 	struct nfp_app *app;
 
 	if (id >= ARRAY_SIZE(apps) || !apps[id]) {
-		nfp_err(pf->cpp, "unknown FW app ID 0x%02hhx, driver too old or support for FW not built in\n", id);
+		nfp_err(pf->cpp, "unknown FW app ID 0x%02x, driver too old or support for FW not built in\n", id);
 		return ERR_PTR(-EINVAL);
 	}
 
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.c b/drivers/net/ethernet/netronome/nfp/nfp_main.c
index 4f88d17536c3..43b9e75a34a5 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_main.c
@@ -392,7 +392,7 @@ nfp_net_fw_find(struct pci_dev *pdev, struct nfp_pf *pf)
 	/* First try to find a firmware image specific for this device */
 	interface = nfp_cpp_interface(pf->cpp);
 	nfp_cpp_serial(pf->cpp, &serial);
-	sprintf(fw_name, "netronome/serial-%pMF-%02hhx-%02hhx.nffw",
+	sprintf(fw_name, "netronome/serial-%pMF-%02x-%02x.nffw",
 		serial, interface >> 8, interface & 0xff);
 	fw = nfp_net_fw_request(pdev, pf, fw_name);
 	if (fw)
-- 
2.37.0.144.g8ac04bfd2-goog