linux-kernel - Re: [PATCH v2] tracing/cfi: Fix cmp_entries

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Date:   Thu, 14 Oct 2021 18:44:48 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kalesh Singh <kaleshsingh@...gle.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org, surenb@...gle.com,
        hridya@...gle.com, namhyung@...nel.org, samitolvanen@...gle.com,
        ndesaulniers@...gle.com, kernel-team@...roid.com,
        Kalesh Singh <kaleshsingh@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] tracing/cfi: Fix cmp_entries_* functions signature
 mismatch

Hi Kalesh,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on 348949d9a4440abdab3b1dc99a9bb660e8c7da7c]

url:    https://github.com/0day-ci/linux/commits/Kalesh-Singh/tracing-cfi-Fix-cmp_entries_-functions-signature-mismatch/20211014-093824
base:   348949d9a4440abdab3b1dc99a9bb660e8c7da7c
config: x86_64-buildonly-randconfig-r002-20211013 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6c76d0101193aa4eb891a6954ff047eda2f9cf71)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/aca9efb61e0559ff7abff8c8bce5e1a65a73ccce
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Kalesh-Singh/tracing-cfi-Fix-cmp_entries_-functions-signature-mismatch/20211014-093824
        git checkout aca9efb61e0559ff7abff8c8bce5e1a65a73ccce
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

>> kernel/trace/tracing_map.c:839:40: error: initializing 'const struct tracing_map_sort_entry **' with an expression of type 'const void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           const struct tracing_map_sort_entry **pa = A;
                                                 ^    ~
   kernel/trace/tracing_map.c:840:40: error: initializing 'const struct tracing_map_sort_entry **' with an expression of type 'const void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           const struct tracing_map_sort_entry **pb = B;
                                                 ^    ~
   kernel/trace/tracing_map.c:853:40: error: initializing 'const struct tracing_map_sort_entry **' with an expression of type 'const void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           const struct tracing_map_sort_entry **pa = A;
                                                 ^    ~
   kernel/trace/tracing_map.c:854:40: error: initializing 'const struct tracing_map_sort_entry **' with an expression of type 'const void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           const struct tracing_map_sort_entry **pb = B;
                                                 ^    ~
   kernel/trace/tracing_map.c:884:40: error: initializing 'const struct tracing_map_sort_entry **' with an expression of type 'const void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           const struct tracing_map_sort_entry **pa = A;
                                                 ^    ~
   kernel/trace/tracing_map.c:885:40: error: initializing 'const struct tracing_map_sort_entry **' with an expression of type 'const void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           const struct tracing_map_sort_entry **pb = B;
                                                 ^    ~
   6 errors generated.


vim +839 kernel/trace/tracing_map.c

   836	
   837	static int cmp_entries_dup(const void *A, const void *B)
   838	{
 > 839		const struct tracing_map_sort_entry **pa = A;
   840		const struct tracing_map_sort_entry **pb = B;
   841		const struct tracing_map_sort_entry *a = *pa;
   842		const struct tracing_map_sort_entry *b = *pb;
   843		int ret = 0;
   844	
   845		if (memcmp(a->key, b->key, a->elt->map->key_size))
   846			ret = 1;
   847	
   848		return ret;
   849	}
   850	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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