lkml.org 
[lkml]   [2019]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
SubjectRe: [PATCH -next] iwlwifi: dbg: work around clang bug by marking debug strings static
From
Date
On Thu, 2019-07-11 at 17:17 -0700, Nick Desaulniers wrote:
> 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@arndb.de>
> Reported-by: Nathan Chancellor <natechancellor@gmail.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.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";

Better still would be to use the format string directly
in both locations instead of trying to deduplicate it
via storing it into a separate pointer.

Let the compiler/linker consolidate the format.
It's smaller object code, allows format/argument verification,
and is simpler for humans to understand.

---
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/dbg.c b/drivers/net/wireless/intel/iwlwifi/fw/dbg.c
index e411ac98290d..25e6712932b8 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/dbg.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/dbg.c
@@ -2438,17 +2438,17 @@ 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[] =
- "WRT: ext=%d. Invalid %s name length %d, expected %d\n";

if (img_name_len != IWL_FW_INI_MAX_IMG_NAME_LEN) {
- IWL_WARN(fwrt, err_str, ext, "image", img_name_len,
+ IWL_WARN(fwrt, "WRT: ext=%d. Invalid %s name length %d, expected %d\n",
+ ext, "image", img_name_len,
IWL_FW_INI_MAX_IMG_NAME_LEN);
return;
}

if (dbg_cfg_name_len != IWL_FW_INI_MAX_DBG_CFG_NAME_LEN) {
- IWL_WARN(fwrt, err_str, ext, "debug cfg", dbg_cfg_name_len,
+ IWL_WARN(fwrt, "WRT: ext=%d. Invalid %s name length %d, expected %d\n",
+ ext, "debug cfg", dbg_cfg_name_len,
IWL_FW_INI_MAX_DBG_CFG_NAME_LEN);
return;
}
@@ -2775,8 +2775,6 @@ 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[] =
- "WRT: ext=%d. Invalid apply point %d for %s\n";

switch (type) {
case IWL_UCODE_TLV_TYPE_DEBUG_INFO:
@@ -2786,8 +2784,8 @@ static void _iwl_fw_dbg_apply_point(struct iwl_fw_runtime *fwrt,
struct iwl_fw_ini_allocation_data *buf_alloc = ini_tlv;

if (pnt != IWL_FW_INI_APPLY_EARLY) {
- IWL_ERR(fwrt, invalid_ap_str, ext, pnt,
- "buffer allocation");
+ IWL_ERR(fwrt, "WRT: ext=%d. Invalid apply point %d for %s\n",
+ ext, pnt, "buffer allocation");
goto next;
}

@@ -2797,8 +2795,8 @@ static void _iwl_fw_dbg_apply_point(struct iwl_fw_runtime *fwrt,
}
case IWL_UCODE_TLV_TYPE_HCMD:
if (pnt < IWL_FW_INI_APPLY_AFTER_ALIVE) {
- IWL_ERR(fwrt, invalid_ap_str, ext, pnt,
- "host command");
+ IWL_ERR(fwrt, "WRT: ext=%d. Invalid apply point %d for %s\n",
+ ext, pnt, "host command");
goto next;
}
iwl_fw_dbg_send_hcmd(fwrt, tlv, ext);

\
 
 \ /
  Last update: 2019-07-12 04:16    [W:0.063 / U:2.212 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site