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Message-ID: <202007080356.fSb8SLZk%lkp@intel.com>
Date: Wed, 8 Jul 2020 03:25:00 +0800
From: kernel test robot <lkp@...el.com>
To: John Ogness <john.ogness@...utronix.de>,
Petr Mladek <pmladek@...e.com>
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
Peter Zijlstra <peterz@...radead.org>,
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
Steven Rostedt <rostedt@...dmis.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andrea Parri <parri.andrea@...il.com>,
Thomas Gleixner <tglx@...utronix.de>,
Paul McKenney <paulmck@...nel.org>, kexec@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/4] printk: use the lockless ringbuffer
Hi John,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on linux/master]
[also build test WARNING on linus/master v5.8-rc4 next-20200707]
[cannot apply to pmladek/for-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/John-Ogness/printk-replace-ringbuffer/20200707-230114
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 9ebcfadb0610322ac537dd7aa5d9cbc2b2894c68
config: arm-randconfig-r014-20200707 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 02946de3802d3bc65bc9f2eb9b8d4969b5a7add8)
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
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
>> kernel/printk/printk.c:1146:10: warning: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
new_descs_size);
^~~~~~~~~~~~~~
include/linux/printk.h:338:33: note: expanded from macro 'pr_err'
printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
~~~ ^~~~~~~~~~~
1 warning generated.
vim +1146 kernel/printk/printk.c
1090
1091 void __init setup_log_buf(int early)
1092 {
1093 unsigned int new_descs_count;
1094 struct prb_desc *new_descs;
1095 struct printk_info info;
1096 struct printk_record r;
1097 size_t new_descs_size;
1098 unsigned long flags;
1099 char *new_dict_buf;
1100 char *new_log_buf;
1101 unsigned int free;
1102 u64 seq;
1103
1104 /*
1105 * Some archs call setup_log_buf() multiple times - first is very
1106 * early, e.g. from setup_arch(), and second - when percpu_areas
1107 * are initialised.
1108 */
1109 if (!early)
1110 set_percpu_data_ready();
1111
1112 if (log_buf != __log_buf)
1113 return;
1114
1115 if (!early && !new_log_buf_len)
1116 log_buf_add_cpu();
1117
1118 if (!new_log_buf_len)
1119 return;
1120
1121 new_descs_count = new_log_buf_len >> PRB_AVGBITS;
1122 if (new_descs_count == 0) {
1123 pr_err("new_log_buf_len: %lu too small\n", new_log_buf_len);
1124 return;
1125 }
1126
1127 new_log_buf = memblock_alloc(new_log_buf_len, LOG_ALIGN);
1128 if (unlikely(!new_log_buf)) {
1129 pr_err("log_buf_len: %lu text bytes not available\n",
1130 new_log_buf_len);
1131 return;
1132 }
1133
1134 new_dict_buf = memblock_alloc(new_log_buf_len, LOG_ALIGN);
1135 if (unlikely(!new_dict_buf)) {
1136 pr_err("log_buf_len: %lu dict bytes not available\n",
1137 new_log_buf_len);
1138 memblock_free(__pa(new_log_buf), new_log_buf_len);
1139 return;
1140 }
1141
1142 new_descs_size = new_descs_count * sizeof(struct prb_desc);
1143 new_descs = memblock_alloc(new_descs_size, LOG_ALIGN);
1144 if (unlikely(!new_descs)) {
1145 pr_err("log_buf_len: %lu desc bytes not available\n",
> 1146 new_descs_size);
1147 memblock_free(__pa(new_dict_buf), new_log_buf_len);
1148 memblock_free(__pa(new_log_buf), new_log_buf_len);
1149 return;
1150 }
1151
1152 prb_rec_init_rd(&r, &info,
1153 &setup_text_buf[0], sizeof(setup_text_buf),
1154 &setup_dict_buf[0], sizeof(setup_dict_buf));
1155
1156 prb_init(&printk_rb_dynamic,
1157 new_log_buf, order_base_2(new_log_buf_len),
1158 new_dict_buf, order_base_2(new_log_buf_len),
1159 new_descs, order_base_2(new_descs_count));
1160
1161 logbuf_lock_irqsave(flags);
1162
1163 log_buf_len = new_log_buf_len;
1164 log_buf = new_log_buf;
1165 new_log_buf_len = 0;
1166
1167 free = __LOG_BUF_LEN;
1168 prb_for_each_record(0, &printk_rb_static, seq, &r)
1169 free -= add_to_rb(&printk_rb_dynamic, &r);
1170
1171 /*
1172 * This is early enough that everything is still running on the
1173 * boot CPU and interrupts are disabled. So no new messages will
1174 * appear during the transition to the dynamic buffer.
1175 */
1176 prb = &printk_rb_dynamic;
1177
1178 logbuf_unlock_irqrestore(flags);
1179
1180 if (seq != prb_next_seq(&printk_rb_static)) {
1181 pr_err("dropped %llu messages\n",
1182 prb_next_seq(&printk_rb_static) - seq);
1183 }
1184
1185 pr_info("log_buf_len: %u bytes\n", log_buf_len);
1186 pr_info("early log buf free: %u(%u%%)\n",
1187 free, (free * 100) / __LOG_BUF_LEN);
1188 }
1189
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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