linux-kernel - Re: [PATCH bpf-next v2 2/3] riscv: implement a memset like function for text

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Date:   Fri, 25 Aug 2023 09:26:29 +0800
From:   kernel test robot <lkp@...el.com>
To:     Puranjay Mohan <puranjay12@...il.com>, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, pulehui@...wei.com,
        conor.dooley@...rochip.com, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
        yhs@...com, kpsingh@...nel.org, bjorn@...nel.org,
        bpf@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     oe-kbuild-all@...ts.linux.dev, puranjay12@...il.com
Subject: Re: [PATCH bpf-next v2 2/3] riscv: implement a memset like function
 for text

Hi Puranjay,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Puranjay-Mohan/riscv-extend-patch_text_nosync-for-multiple-pages/20230824-213410
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20230824133135.1176709-3-puranjay12%40gmail.com
patch subject: [PATCH bpf-next v2 2/3] riscv: implement a memset like function for text
config: riscv-allnoconfig (https://download.01.org/0day-ci/archive/20230825/202308250924.NlFcBoND-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230825/202308250924.NlFcBoND-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308250924.NlFcBoND-lkp@intel.com/

All warnings (new ones prefixed by >>):

   arch/riscv/kernel/patch.c: In function '__patch_insn_set':
>> arch/riscv/kernel/patch.c:61:13: warning: unused variable 'ret' [-Wunused-variable]
      61 |         int ret;
         |             ^~~


vim +/ret +61 arch/riscv/kernel/patch.c

    56	
    57	static int __patch_insn_set(void *addr, const int c, size_t len)
    58	{
    59		void *waddr = addr;
    60		bool across_pages = (((uintptr_t) addr & ~PAGE_MASK) + len) > PAGE_SIZE;
  > 61		int ret;
    62	
    63		/*
    64		 * Only two pages can be mapped at a time for writing.
    65		 */
    66		if (len > 2 * PAGE_SIZE)
    67			return -EINVAL;
    68	
    69		if (across_pages)
    70			patch_map(addr + PAGE_SIZE, FIX_TEXT_POKE1);
    71	
    72		waddr = patch_map(addr, FIX_TEXT_POKE0);
    73	
    74		memset(waddr, c, len);
    75	
    76		patch_unmap(FIX_TEXT_POKE0);
    77	
    78		if (across_pages)
    79			patch_unmap(FIX_TEXT_POKE1);
    80	
    81		return 0;
    82	}
    83	NOKPROBE_SYMBOL(__patch_insn_set);
    84	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki