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Message-ID: <20201009121744.GO1042@kadam>
Date: Fri, 9 Oct 2020 15:17:44 +0300
From: Dan Carpenter <dan.carpenter@...cle.com>
To: kbuild@...ts.01.org,
Harshad Shirwadkar <harshadshirwadkar@...il.com>
Cc: lkp@...el.com, kbuild-all@...ts.01.org, linux-ext4@...r.kernel.org,
"Theodore Ts'o" <tytso@....edu>
Subject: [ext4:dev 9/44] fs/ext4/fast_commit.c:1135 ext4_fc_commit() error:
uninitialized symbol 'start_time'.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
head: ab7b179af3f98772f2433ddc4ace6b7924a4e862
commit: 96df8fb629b26ce3b0b10c9b730965788786bb8c [9/44] ext4: main fast-commit commit path
config: i386-randconfig-m021-20201009 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
smatch warnings:
fs/ext4/fast_commit.c:1135 ext4_fc_commit() error: uninitialized symbol 'start_time'.
vim +/start_time +1135 fs/ext4/fast_commit.c
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1068 int ext4_fc_commit(journal_t *journal, tid_t commit_tid)
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1069 {
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1070 struct super_block *sb = (struct super_block *)(journal->j_private);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1071 struct ext4_sb_info *sbi = EXT4_SB(sb);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1072 int nblks = 0, ret, bsize = journal->j_blocksize;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1073 int subtid = atomic_read(&sbi->s_fc_subtid);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1074 int reason = EXT4_FC_REASON_OK, fc_bufs_before = 0;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1075 ktime_t start_time, commit_time;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1076
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1077 trace_ext4_fc_commit_start(sb);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1078
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1079 if (!test_opt2(sb, JOURNAL_FAST_COMMIT) ||
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1080 (ext4_fc_is_ineligible(sb))) {
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1081 reason = EXT4_FC_REASON_INELIGIBLE;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1082 goto out;
^^^^^^^^^
"start_time" needs to be initialized first at the very start of the
function.
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1083 }
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1084
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1085 start_time = ktime_get();
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1086 restart_fc:
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1087 ret = jbd2_fc_start(journal, commit_tid);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1088 if (ret == -EALREADY) {
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1089 /* There was an ongoing commit, check if we need to restart */
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1090 if (atomic_read(&sbi->s_fc_subtid) <= subtid &&
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1091 commit_tid > journal->j_commit_sequence)
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1092 goto restart_fc;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1093 reason = EXT4_FC_REASON_ALREADY_COMMITTED;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1094 goto out;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1095 } else if (ret) {
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1096 sbi->s_fc_stats.fc_ineligible_reason_count[EXT4_FC_COMMIT_FAILED]++;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1097 reason = EXT4_FC_REASON_FC_START_FAILED;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1098 goto out;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1099 }
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1100
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1101 fc_bufs_before = (sbi->s_fc_bytes + bsize - 1) / bsize;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1102 ret = ext4_fc_perform_commit(journal);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1103 if (ret < 0) {
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1104 sbi->s_fc_stats.fc_ineligible_reason_count[EXT4_FC_COMMIT_FAILED]++;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1105 reason = EXT4_FC_REASON_FC_FAILED;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1106 goto out;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1107 }
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1108 nblks = (sbi->s_fc_bytes + bsize - 1) / bsize - fc_bufs_before;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1109 ret = jbd2_fc_wait_bufs(journal, nblks);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1110 if (ret < 0) {
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1111 sbi->s_fc_stats.fc_ineligible_reason_count[EXT4_FC_COMMIT_FAILED]++;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1112 reason = EXT4_FC_REASON_FC_FAILED;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1113 goto out;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1114 }
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1115 atomic_inc(&sbi->s_fc_subtid);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1116 jbd2_fc_stop(journal);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1117 out:
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1118 /* Has any ineligible update happened since we started? */
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1119 if (reason == EXT4_FC_REASON_OK && ext4_fc_is_ineligible(sb)) {
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1120 sbi->s_fc_stats.fc_ineligible_reason_count[EXT4_FC_COMMIT_FAILED]++;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1121 reason = EXT4_FC_REASON_INELIGIBLE;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1122 }
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1123
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1124 spin_lock(&sbi->s_fc_lock);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1125 if (reason != EXT4_FC_REASON_OK &&
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1126 reason != EXT4_FC_REASON_ALREADY_COMMITTED) {
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1127 sbi->s_fc_stats.fc_ineligible_commits++;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1128 } else {
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1129 sbi->s_fc_stats.fc_num_commits++;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1130 sbi->s_fc_stats.fc_numblks += nblks;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1131 }
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1132 spin_unlock(&sbi->s_fc_lock);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1133 nblks = (reason == EXT4_FC_REASON_OK) ? nblks : 0;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1134 trace_ext4_fc_commit_stop(sb, nblks, reason);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 @1135 commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1136 /*
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1137 * weight the commit time higher than the average time so we don't
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1138 * react too strongly to vast changes in the commit time
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1139 */
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1140 if (likely(sbi->s_fc_avg_commit_time))
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1141 sbi->s_fc_avg_commit_time = (commit_time +
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1142 sbi->s_fc_avg_commit_time * 3) / 4;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1143 else
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1144 sbi->s_fc_avg_commit_time = commit_time;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1145 jbd_debug(1,
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1146 "Fast commit ended with blks = %d, reason = %d, subtid - %d",
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1147 nblks, reason, subtid);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1148 if (reason == EXT4_FC_REASON_FC_FAILED)
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1149 return jbd2_fc_stop_do_commit(journal, commit_tid);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1150 if (reason == EXT4_FC_REASON_FC_START_FAILED ||
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1151 reason == EXT4_FC_REASON_INELIGIBLE)
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1152 return jbd2_complete_transaction(journal, commit_tid);
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1153 return 0;
96df8fb629b26ce Harshad Shirwadkar 2020-09-18 1154 }
---
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