linux-kernel - Re: [PATCH v2 2/2] kernel.h: Disable -Wreturn-stack-address for _THIS_IP

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Date:   Tue, 31 Jul 2018 18:27:00 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     kbuild-all@...org, akpm@...ux-foundation.org,
        natechancellor@...il.com, arnd@...db.de, paul.burton@...s.com,
        christophe.leroy@....fr, shorne@...il.com,
        yamada.masahiro@...ionext.com, keescook@...omium.org,
        mingo@...nel.org, gregkh@...uxfoundation.org, tglx@...utronix.de,
        rdunlap@...radead.org, bp@...e.de, neilb@...e.com,
        linux-kernel@...r.kernel.org, aryabinin@...tuozzo.com,
        dwmw@...zon.co.uk, sandipan@...ux.vnet.ibm.com,
        linux@...musvillemoes.dk, paullawrence@...gle.com,
        andreyknvl@...gle.com, will.deacon@....com, ghackmann@...roid.com,
        stable@...r.kernel.org, ghackmann@...gle.com, mka@...omium.org,
        jpoimboe@...hat.com, wvw@...gle.com, avagin@...nvz.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v2 2/2] kernel.h: Disable -Wreturn-stack-address for
 _THIS_IP_

Hi Nick,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v4.18-rc7 next-20180727]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Nick-Desaulniers/compiler-clang-h-Add-CLANG_VERSION-and-__diag-macros/20180731-161932
config: x86_64-fedora-25 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   drivers/net//wireless/intel/iwlwifi/iwl-trans.c: In function 'iwl_trans_send_cmd':
>> drivers/net//wireless/intel/iwlwifi/iwl-trans.c:137:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if (!(cmd->flags & CMD_ASYNC))
     ^~
   drivers/net//wireless/intel/iwlwifi/iwl-trans.c:138:1: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
      lock_map_acquire_read(&trans->sync_cmd_lockdep_map);
    ^ ~

vim +/if +137 drivers/net//wireless/intel/iwlwifi/iwl-trans.c

92fe8343 Emmanuel Grumbach 2015-12-01  116  
92fe8343 Emmanuel Grumbach 2015-12-01  117  int iwl_trans_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
92fe8343 Emmanuel Grumbach 2015-12-01  118  {
92fe8343 Emmanuel Grumbach 2015-12-01  119  	int ret;
92fe8343 Emmanuel Grumbach 2015-12-01  120  
92fe8343 Emmanuel Grumbach 2015-12-01  121  	if (unlikely(!(cmd->flags & CMD_SEND_IN_RFKILL) &&
326477e4 Johannes Berg     2017-04-25  122  		     test_bit(STATUS_RFKILL_OPMODE, &trans->status)))
92fe8343 Emmanuel Grumbach 2015-12-01  123  		return -ERFKILL;
92fe8343 Emmanuel Grumbach 2015-12-01  124  
92fe8343 Emmanuel Grumbach 2015-12-01  125  	if (unlikely(test_bit(STATUS_FW_ERROR, &trans->status)))
92fe8343 Emmanuel Grumbach 2015-12-01  126  		return -EIO;
92fe8343 Emmanuel Grumbach 2015-12-01  127  
92fe8343 Emmanuel Grumbach 2015-12-01  128  	if (unlikely(trans->state != IWL_TRANS_FW_ALIVE)) {
92fe8343 Emmanuel Grumbach 2015-12-01  129  		IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
92fe8343 Emmanuel Grumbach 2015-12-01  130  		return -EIO;
92fe8343 Emmanuel Grumbach 2015-12-01  131  	}
92fe8343 Emmanuel Grumbach 2015-12-01  132  
92fe8343 Emmanuel Grumbach 2015-12-01  133  	if (WARN_ON((cmd->flags & CMD_WANT_ASYNC_CALLBACK) &&
92fe8343 Emmanuel Grumbach 2015-12-01  134  		    !(cmd->flags & CMD_ASYNC)))
92fe8343 Emmanuel Grumbach 2015-12-01  135  		return -EINVAL;
92fe8343 Emmanuel Grumbach 2015-12-01  136  
92fe8343 Emmanuel Grumbach 2015-12-01 @137  	if (!(cmd->flags & CMD_ASYNC))
92fe8343 Emmanuel Grumbach 2015-12-01  138  		lock_map_acquire_read(&trans->sync_cmd_lockdep_map);
92fe8343 Emmanuel Grumbach 2015-12-01  139  
5b88792c Sara Sharon       2016-08-15  140  	if (trans->wide_cmd_header && !iwl_cmd_groupid(cmd->id))
5b88792c Sara Sharon       2016-08-15  141  		cmd->id = DEF_ID(cmd->id);
5b88792c Sara Sharon       2016-08-15  142  
92fe8343 Emmanuel Grumbach 2015-12-01  143  	ret = trans->ops->send_cmd(trans, cmd);
92fe8343 Emmanuel Grumbach 2015-12-01  144  
92fe8343 Emmanuel Grumbach 2015-12-01  145  	if (!(cmd->flags & CMD_ASYNC))
92fe8343 Emmanuel Grumbach 2015-12-01  146  		lock_map_release(&trans->sync_cmd_lockdep_map);
92fe8343 Emmanuel Grumbach 2015-12-01  147  
0ec971fd Johannes Berg     2017-04-10  148  	if (WARN_ON((cmd->flags & CMD_WANT_SKB) && !ret && !cmd->resp_pkt))
0ec971fd Johannes Berg     2017-04-10  149  		return -EIO;
0ec971fd Johannes Berg     2017-04-10  150  
92fe8343 Emmanuel Grumbach 2015-12-01  151  	return ret;
92fe8343 Emmanuel Grumbach 2015-12-01  152  }
92fe8343 Emmanuel Grumbach 2015-12-01  153  IWL_EXPORT_SYMBOL(iwl_trans_send_cmd);
39bdb17e Sharon Dvir       2015-10-15  154  

:::::: The code at line 137 was first introduced by commit
:::::: 92fe83430b899b786c837e5b716a328220d47ae5 iwlwifi: uninline iwl_trans_send_cmd

:::::: TO: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
:::::: CC: Emmanuel Grumbach <emmanuel.grumbach@...el.com>

---
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