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From:   Dan Carpenter <dan.carpenter@linaro.org>
Date:   Tue, 28 Nov 2023 09:22:50 +0300
To:     oe-kbuild@lists.linux.dev, Vineet Gupta <vgupta@kernel.org>
Cc:     lkp@intel.com, oe-kbuild-all@lists.linux.dev,
        linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org
Subject: arch/arc/kernel/setup.c:203 arcv2_mumbojumbo() error: uninitialized
 symbol 'release'.
Message-ID: <c2148229-bea9-40ef-bbf3-6019555f3f1a@suswa.mountain>
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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2cc14f52aeb78ce3f29677c2de1f06c0e91471ab
commit: fad84e39f116035ae8d550c6020107b8ac113b45 ARC: boot log: eliminate struct cpuinfo_arc #4: boot log per ISA
config: arc-randconfig-r071-20231128 (https://download.01.org/0day-ci/archive/20231128/202311280906.VAIwEAfT-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231128/202311280906.VAIwEAfT-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@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202311280906.VAIwEAfT-lkp@intel.com/

New smatch warnings:
arch/arc/kernel/setup.c:203 arcv2_mumbojumbo() error: uninitialized symbol 'release'.

Old smatch warnings:
arch/arc/include/asm/thread_info.h:62 current_thread_info() error: uninitialized symbol 'sp'.

vim +/release +203 arch/arc/kernel/setup.c

fad84e39f11603 Vineet Gupta 2020-06-11  150  static int arcv2_mumbojumbo(int c, struct cpuinfo_arc *info, char *buf, int len)
fad84e39f11603 Vineet Gupta 2020-06-11  151  {
fad84e39f11603 Vineet Gupta 2020-06-11  152  	int n = 0;
fad84e39f11603 Vineet Gupta 2020-06-11  153  #ifdef CONFIG_ISA_ARCV2
fad84e39f11603 Vineet Gupta 2020-06-11  154  	const char *release, *cpu_nm, *isa_nm = "ARCv2";
fad84e39f11603 Vineet Gupta 2020-06-11  155  	int dual_issue = 0, dual_enb = 0, mpy_opt, present;
fad84e39f11603 Vineet Gupta 2020-06-11  156  	int bpu_full, bpu_cache, bpu_pred, bpu_ret_stk;
fad84e39f11603 Vineet Gupta 2020-06-11  157  	char mpy_nm[16], lpb_nm[32];
fad84e39f11603 Vineet Gupta 2020-06-11  158  	struct bcr_isa_arcv2 isa;
fad84e39f11603 Vineet Gupta 2020-06-11  159  	struct bcr_mpy mpy;
fad84e39f11603 Vineet Gupta 2020-06-11  160  	struct bcr_fp_arcv2 fpu;
fad84e39f11603 Vineet Gupta 2020-06-11  161  	struct bcr_bpu_arcv2 bpu;
fad84e39f11603 Vineet Gupta 2020-06-11  162  	struct bcr_lpb lpb;
fad84e39f11603 Vineet Gupta 2020-06-11  163  	struct bcr_iccm_arcv2 iccm;
fad84e39f11603 Vineet Gupta 2020-06-11  164  	struct bcr_dccm_arcv2 dccm;
fad84e39f11603 Vineet Gupta 2020-06-11  165  	struct bcr_erp erp;
00a4ae65cc600b Vineet Gupta 2019-02-25  166  
00a4ae65cc600b Vineet Gupta 2019-02-25  167  	/*
97d0b5d0b5a998 Vineet Gupta 2020-06-10  168  	 * Initial HS cores bumped AUX IDENTITY.ARCVER for each release until
97d0b5d0b5a998 Vineet Gupta 2020-06-10  169  	 * ARCVER 0x54 which introduced AUX MICRO_ARCH_BUILD and subsequent
97d0b5d0b5a998 Vineet Gupta 2020-06-10  170  	 * releases only update it.
00a4ae65cc600b Vineet Gupta 2019-02-25  171  	 */
00a4ae65cc600b Vineet Gupta 2019-02-25  172  
fad84e39f11603 Vineet Gupta 2020-06-11  173  	cpu_nm = "HS38";
00a4ae65cc600b Vineet Gupta 2019-02-25  174  
fad84e39f11603 Vineet Gupta 2020-06-11  175  	if (info->arcver > 0x50 && info->arcver <= 0x53) {
fad84e39f11603 Vineet Gupta 2020-06-11  176  		release = arc_hs_rel[info->arcver - 0x51].str;
00a4ae65cc600b Vineet Gupta 2019-02-25  177  	} else {
fad84e39f11603 Vineet Gupta 2020-06-11  178  		const struct id_to_str *tbl;
fad84e39f11603 Vineet Gupta 2020-06-11  179  		struct bcr_uarch_build uarch;
fad84e39f11603 Vineet Gupta 2020-06-11  180  
fad84e39f11603 Vineet Gupta 2020-06-11  181  		READ_BCR(ARC_REG_MICRO_ARCH_BCR, uarch);
00a4ae65cc600b Vineet Gupta 2019-02-25  182  
97d0b5d0b5a998 Vineet Gupta 2020-06-10  183  		for (tbl = &arc_hs_ver54_rel[0]; tbl->id != 0xFF; tbl++) {
00a4ae65cc600b Vineet Gupta 2019-02-25  184  			if (uarch.maj == tbl->id) {
fad84e39f11603 Vineet Gupta 2020-06-11  185  				release = tbl->str;

Will we always hit this assignment?

d975cbc8acb6f4 Vineet Gupta 2016-10-27  186  				break;
d975cbc8acb6f4 Vineet Gupta 2016-10-27  187  			}
00a4ae65cc600b Vineet Gupta 2019-02-25  188  		}
fad84e39f11603 Vineet Gupta 2020-06-11  189  		if (uarch.prod == 4) {
fad84e39f11603 Vineet Gupta 2020-06-11  190  			unsigned int exec_ctrl;
00a4ae65cc600b Vineet Gupta 2019-02-25  191  
fad84e39f11603 Vineet Gupta 2020-06-11  192  			cpu_nm = "HS48";
fad84e39f11603 Vineet Gupta 2020-06-11  193  			dual_issue = 1;
fad84e39f11603 Vineet Gupta 2020-06-11  194  			/* if dual issue hardware, is it enabled ? */
fad84e39f11603 Vineet Gupta 2020-06-11  195  			READ_BCR(AUX_EXEC_CTRL, exec_ctrl);
fad84e39f11603 Vineet Gupta 2020-06-11  196  			dual_enb = !(exec_ctrl & 1);
fad84e39f11603 Vineet Gupta 2020-06-11  197  		}
fad84e39f11603 Vineet Gupta 2020-06-11  198  	}
73e284d2572581 Vineet Gupta 2016-10-20  199  
fad84e39f11603 Vineet Gupta 2020-06-11  200  	READ_BCR(ARC_REG_ISA_CFG_BCR, isa);
b89bd1f4fbaeca Vineet Gupta 2016-01-22  201  
fad84e39f11603 Vineet Gupta 2020-06-11  202  	n += scnprintf(buf + n, len - n, "processor [%d]\t: %s %s (%s ISA) %s%s%s\n",
fad84e39f11603 Vineet Gupta 2020-06-11 @203  		       c, cpu_nm, release, isa_nm,
fad84e39f11603 Vineet Gupta 2020-06-11  204  		       IS_AVAIL1(isa.be, "[Big-Endian]"),
fad84e39f11603 Vineet Gupta 2020-06-11  205  		       IS_AVAIL3(dual_issue, dual_enb, " Dual-Issue "));
af61742813aa9d Vineet Gupta 2013-01-18  206  

-- 
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https://github.com/intel/lkp-tests/wiki