netdev - [PATCH -next] iwlwifi: dbg: work around clang bug by marking debug strings static

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Date:   Thu, 11 Jul 2019 17:17:06 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     kvalo@...eaurora.org
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <natechancellor@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Intel Linux Wireless <linuxwifi@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Shahar S Matityahu <shahar.s.matityahu@...el.com>,
        Sara Sharon <sara.sharon@...el.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: [PATCH -next] iwlwifi: dbg: work around clang bug by marking debug
 strings static

Commit r353569 in prerelease Clang-9 is producing a linkage failure:

ld: drivers/net/wireless/intel/iwlwifi/fw/dbg.o:
in function `_iwl_fw_dbg_apply_point':
dbg.c:(.text+0x827a): undefined reference to `__compiletime_assert_2387'

when the following configs are enabled:
- CONFIG_IWLWIFI
- CONFIG_IWLMVM
- CONFIG_KASAN

Work around the issue for now by marking the debug strings as `static`,
which they probably should be any ways.

Link: https://bugs.llvm.org/show_bug.cgi?id=42580
Link: https://github.com/ClangBuiltLinux/linux/issues/580
Reported-by: Arnd Bergmann <arnd@...db.de>
Reported-by: Nathan Chancellor <natechancellor@...il.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
 drivers/net/wireless/intel/iwlwifi/fw/dbg.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/dbg.c b/drivers/net/wireless/intel/iwlwifi/fw/dbg.c
index e411ac98290d..f8c90ea4e9b4 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/dbg.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/dbg.c
@@ -2438,7 +2438,7 @@ static void iwl_fw_dbg_info_apply(struct iwl_fw_runtime *fwrt,
 {
 	u32 img_name_len = le32_to_cpu(dbg_info->img_name_len);
 	u32 dbg_cfg_name_len = le32_to_cpu(dbg_info->dbg_cfg_name_len);
-	const char err_str[] =
+	static const char err_str[] =
 		"WRT: ext=%d. Invalid %s name length %d, expected %d\n";
 
 	if (img_name_len != IWL_FW_INI_MAX_IMG_NAME_LEN) {
@@ -2775,7 +2775,7 @@ static void _iwl_fw_dbg_apply_point(struct iwl_fw_runtime *fwrt,
 		struct iwl_ucode_tlv *tlv = iter;
 		void *ini_tlv = (void *)tlv->data;
 		u32 type = le32_to_cpu(tlv->type);
-		const char invalid_ap_str[] =
+		static const char invalid_ap_str[] =
 			"WRT: ext=%d. Invalid apply point %d for %s\n";
 
 		switch (type) {
-- 
2.22.0.410.gd8fdbe21b5-goog