* [linux-next:master 12773/13763] include/linux/dev_printk.h:154:24: warning: 'len' is used uninitialized in this function
@ 2026-06-14 5:20 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-06-14 5:20 UTC (permalink / raw)
To: Rosen Penev; +Cc: oe-kbuild-all, Miquel Raynal
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: c425609d6ac4012c8bbf01ec2e10e801b1923a7b
commit: 4f2692a5383e4bdd43ae940cda012360f7217a2d [12773/13763] mtd: rawnand: ndfc: use ioread32be/iowrite32be and allow COMPILE_TEST
config: alpha-randconfig-r062-20260614 (https://download.01.org/0day-ci/archive/20260614/202606141301.iyVdFgl7-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260614/202606141301.iyVdFgl7-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>
| Closes: https://lore.kernel.org/oe-kbuild-all/202606141301.iyVdFgl7-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from include/linux/device.h:15,
from include/linux/mtd/mtd.h:13,
from include/linux/mtd/rawnand.h:16,
from drivers/mtd/nand/raw/ndfc.c:20:
drivers/mtd/nand/raw/ndfc.c: In function 'ndfc_probe':
>> include/linux/dev_printk.h:154:24: warning: 'len' is used uninitialized in this function [-Wuninitialized]
dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
^~~~~~~~
drivers/mtd/nand/raw/ndfc.c:191:11: note: 'len' was declared here
int err, len;
^~~
vim +/len +154 include/linux/dev_printk.h
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 99
ad7d61f159db739 Chris Down 2021-06-15 100 /*
ad7d61f159db739 Chris Down 2021-06-15 101 * Need to take variadic arguments even though we don't use them, as dev_fmt()
ad7d61f159db739 Chris Down 2021-06-15 102 * may only just have been expanded and may result in multiple arguments.
ad7d61f159db739 Chris Down 2021-06-15 103 */
ad7d61f159db739 Chris Down 2021-06-15 104 #define dev_printk_index_emit(level, fmt, ...) \
ad7d61f159db739 Chris Down 2021-06-15 105 printk_index_subsys_emit("%s %s: ", level, fmt)
ad7d61f159db739 Chris Down 2021-06-15 106
ad7d61f159db739 Chris Down 2021-06-15 107 #define dev_printk_index_wrap(_p_func, level, dev, fmt, ...) \
ad7d61f159db739 Chris Down 2021-06-15 108 ({ \
ad7d61f159db739 Chris Down 2021-06-15 109 dev_printk_index_emit(level, fmt); \
ad7d61f159db739 Chris Down 2021-06-15 110 _p_func(dev, fmt, ##__VA_ARGS__); \
ad7d61f159db739 Chris Down 2021-06-15 111 })
ad7d61f159db739 Chris Down 2021-06-15 112
ad7d61f159db739 Chris Down 2021-06-15 113 /*
ad7d61f159db739 Chris Down 2021-06-15 114 * Some callsites directly call dev_printk rather than going through the
ad7d61f159db739 Chris Down 2021-06-15 115 * dev_<level> infrastructure, so we need to emit here as well as inside those
ad7d61f159db739 Chris Down 2021-06-15 116 * level-specific macros. Only one index entry will be produced, either way,
ad7d61f159db739 Chris Down 2021-06-15 117 * since dev_printk's `fmt` isn't known at compile time if going through the
ad7d61f159db739 Chris Down 2021-06-15 118 * dev_<level> macros.
ad7d61f159db739 Chris Down 2021-06-15 119 *
ad7d61f159db739 Chris Down 2021-06-15 120 * dev_fmt() isn't called for dev_printk when used directly, as it's used by
ad7d61f159db739 Chris Down 2021-06-15 121 * the dev_<level> macros internally which already have dev_fmt() processed.
ad7d61f159db739 Chris Down 2021-06-15 122 *
ad7d61f159db739 Chris Down 2021-06-15 123 * We also can't use dev_printk_index_wrap directly, because we have a separate
ad7d61f159db739 Chris Down 2021-06-15 124 * level to process.
ad7d61f159db739 Chris Down 2021-06-15 125 */
ad7d61f159db739 Chris Down 2021-06-15 126 #define dev_printk(level, dev, fmt, ...) \
ad7d61f159db739 Chris Down 2021-06-15 127 ({ \
ad7d61f159db739 Chris Down 2021-06-15 128 dev_printk_index_emit(level, fmt); \
ad7d61f159db739 Chris Down 2021-06-15 129 _dev_printk(level, dev, fmt, ##__VA_ARGS__); \
ad7d61f159db739 Chris Down 2021-06-15 130 })
ad7d61f159db739 Chris Down 2021-06-15 131
c26ec799042a388 Geert Uytterhoeven 2024-02-28 132 /*
c26ec799042a388 Geert Uytterhoeven 2024-02-28 133 * Dummy dev_printk for disabled debugging statements to use whilst maintaining
c26ec799042a388 Geert Uytterhoeven 2024-02-28 134 * gcc's format checking.
c26ec799042a388 Geert Uytterhoeven 2024-02-28 135 */
c26ec799042a388 Geert Uytterhoeven 2024-02-28 136 #define dev_no_printk(level, dev, fmt, ...) \
c26ec799042a388 Geert Uytterhoeven 2024-02-28 137 ({ \
c26ec799042a388 Geert Uytterhoeven 2024-02-28 138 if (0) \
c26ec799042a388 Geert Uytterhoeven 2024-02-28 139 _dev_printk(level, dev, fmt, ##__VA_ARGS__); \
c26ec799042a388 Geert Uytterhoeven 2024-02-28 140 })
c26ec799042a388 Geert Uytterhoeven 2024-02-28 141
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 142 /*
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 143 * #defines for all the dev_<level> macros to prefix with whatever
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 144 * possible use of #define dev_fmt(fmt) ...
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 145 */
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 146
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 147 #define dev_emerg(dev, fmt, ...) \
ad7d61f159db739 Chris Down 2021-06-15 148 dev_printk_index_wrap(_dev_emerg, KERN_EMERG, dev, dev_fmt(fmt), ##__VA_ARGS__)
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 149 #define dev_crit(dev, fmt, ...) \
ad7d61f159db739 Chris Down 2021-06-15 150 dev_printk_index_wrap(_dev_crit, KERN_CRIT, dev, dev_fmt(fmt), ##__VA_ARGS__)
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 151 #define dev_alert(dev, fmt, ...) \
ad7d61f159db739 Chris Down 2021-06-15 152 dev_printk_index_wrap(_dev_alert, KERN_ALERT, dev, dev_fmt(fmt), ##__VA_ARGS__)
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 153 #define dev_err(dev, fmt, ...) \
ad7d61f159db739 Chris Down 2021-06-15 @154 dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 155 #define dev_warn(dev, fmt, ...) \
ad7d61f159db739 Chris Down 2021-06-15 156 dev_printk_index_wrap(_dev_warn, KERN_WARNING, dev, dev_fmt(fmt), ##__VA_ARGS__)
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 157 #define dev_notice(dev, fmt, ...) \
ad7d61f159db739 Chris Down 2021-06-15 158 dev_printk_index_wrap(_dev_notice, KERN_NOTICE, dev, dev_fmt(fmt), ##__VA_ARGS__)
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 159 #define dev_info(dev, fmt, ...) \
ad7d61f159db739 Chris Down 2021-06-15 160 dev_printk_index_wrap(_dev_info, KERN_INFO, dev, dev_fmt(fmt), ##__VA_ARGS__)
af628aae8640c26 Greg Kroah-Hartman 2019-12-09 161
:::::: The code at line 154 was first introduced by commit
:::::: ad7d61f159db73974f1b0352f21afe04b0bbd920 printk: index: Add indexing support to dev_printk
:::::: TO: Chris Down <chris@chrisdown.name>
:::::: CC: Petr Mladek <pmladek@suse.com>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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