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Date: Tue, 16 Jul 2019 10:28:39 -0700
From: Nick Desaulniers <ndesaulniers@...gle.com>
To: Joe Perches <joe@...ches.com>, Kalle Valo <kvalo@...eaurora.org>
Cc: 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,
LKML <linux-kernel@...r.kernel.org>,
clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH -next] iwlwifi: dbg: work around clang bug by marking
debug strings static
On Thu, Jul 11, 2019 at 7:15 PM Joe Perches <joe@...ches.com> wrote:
>
> 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@...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";
>
> 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.
Whichever Kalle prefers, I just want my CI green again.
>
> ---
> 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);
>
>
--
Thanks,
~Nick Desaulniers
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