Re: [PATCH 8/8] ring-buffer: Validate boot range memory events

From: kernel test robot
Date: Fri Mar 08 2024 - 10:40:10 EST

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Hi Steven,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20240305]
[cannot apply to tip/x86/core akpm-mm/mm-everything linus/master v6.8-rc7 v6.8-rc6 v6.8-rc5 v6.8-rc7]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Steven-Rostedt/ring-buffer-Allow-mapped-field-to-be-set-without-mapping/20240306-100047
base: next-20240305
patch link: https://lore.kernel.org/r/20240306020006.586558735%40goodmis.org
patch subject: [PATCH 8/8] ring-buffer: Validate boot range memory events
config: microblaze-allmodconfig (https://download.01.org/0day-ci/archive/20240308/202403082327.SiOUrqxy-lkp@xxxxxxxxx/config)
compiler: microblaze-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240308/202403082327.SiOUrqxy-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403082327.SiOUrqxy-lkp@xxxxxxxxx/

All error/warnings (new ones prefixed by >>):

kernel/trace/ring_buffer.c: In function 'rb_read_data_buffer':
>> kernel/trace/ring_buffer.c:1629:29: error: 'cpu_buffer' undeclared (first use in this function)
1629 | atomic_inc(&cpu_buffer->record_disabled); \
| ^~~~~~~~~~
kernel/trace/ring_buffer.c:1667:33: note: in expansion of macro 'buffer_warn_return'
1667 | buffer_warn_return("[CPU: %d]ABSOLUTE TIME WENT BACKWARDS: last ts: %lld absolute ts: %lld\n",
| ^~~~~~~~~~~~~~~~~~
kernel/trace/ring_buffer.c:1629:29: note: each undeclared identifier is reported only once for each function it appears in
1629 | atomic_inc(&cpu_buffer->record_disabled); \
| ^~~~~~~~~~
kernel/trace/ring_buffer.c:1667:33: note: in expansion of macro 'buffer_warn_return'
1667 | buffer_warn_return("[CPU: %d]ABSOLUTE TIME WENT BACKWARDS: last ts: %lld absolute ts: %lld\n",
| ^~~~~~~~~~~~~~~~~~
>> kernel/trace/ring_buffer.c:1631:17: error: implicit declaration of function 'dump_buffer_page'; did you mean 'free_buffer_page'? [-Werror=implicit-function-declaration]
1631 | dump_buffer_page(bpage, info, tail); \
| ^~~~~~~~~~~~~~~~
kernel/trace/ring_buffer.c:1667:33: note: in expansion of macro 'buffer_warn_return'
1667 | buffer_warn_return("[CPU: %d]ABSOLUTE TIME WENT BACKWARDS: last ts: %lld absolute ts: %lld\n",
| ^~~~~~~~~~~~~~~~~~
>> kernel/trace/ring_buffer.c:1631:34: error: 'bpage' undeclared (first use in this function); did you mean 'dpage'?
1631 | dump_buffer_page(bpage, info, tail); \
| ^~~~~
kernel/trace/ring_buffer.c:1667:33: note: in expansion of macro 'buffer_warn_return'
1667 | buffer_warn_return("[CPU: %d]ABSOLUTE TIME WENT BACKWARDS: last ts: %lld absolute ts: %lld\n",
| ^~~~~~~~~~~~~~~~~~
>> kernel/trace/ring_buffer.c:1631:41: error: 'info' undeclared (first use in this function)
1631 | dump_buffer_page(bpage, info, tail); \
| ^~~~
kernel/trace/ring_buffer.c:1667:33: note: in expansion of macro 'buffer_warn_return'
1667 | buffer_warn_return("[CPU: %d]ABSOLUTE TIME WENT BACKWARDS: last ts: %lld absolute ts: %lld\n",
| ^~~~~~~~~~~~~~~~~~
>> kernel/trace/ring_buffer.c:1636:25: warning: 'return' with no value, in function returning non-void [-Wreturn-type]
1636 | return; \
| ^~~~~~
kernel/trace/ring_buffer.c:1667:33: note: in expansion of macro 'buffer_warn_return'
1667 | buffer_warn_return("[CPU: %d]ABSOLUTE TIME WENT BACKWARDS: last ts: %lld absolute ts: %lld\n",
| ^~~~~~~~~~~~~~~~~~
kernel/trace/ring_buffer.c:1642:12: note: declared here
1642 | static int rb_read_data_buffer(struct buffer_data_page *dpage, int tail, int cpu,
| ^~~~~~~~~~~~~~~~~~~
>> kernel/trace/ring_buffer.c:1667:33: error: label 'out' used but not defined
1667 | buffer_warn_return("[CPU: %d]ABSOLUTE TIME WENT BACKWARDS: last ts: %lld absolute ts: %lld\n",
| ^~~~~~~~~~~~~~~~~~
kernel/trace/ring_buffer.c: In function 'rb_set_commit_to_write':
kernel/trace/ring_buffer.c:3588:45: warning: assignment to 'long unsigned int' from 'struct buffer_data_page *' makes integer from pointer without a cast [-Wint-conversion]
3588 | meta->commit_buffer = cpu_buffer->commit_page->page;
| ^
kernel/trace/ring_buffer.c: At top level:
>> kernel/trace/ring_buffer.c:3957:13: warning: conflicting types for 'dump_buffer_page'; have 'void(struct buffer_data_page *, struct rb_event_info *, long unsigned int)'
3957 | static void dump_buffer_page(struct buffer_data_page *bpage,
| ^~~~~~~~~~~~~~~~
>> kernel/trace/ring_buffer.c:3957:13: error: static declaration of 'dump_buffer_page' follows non-static declaration
kernel/trace/ring_buffer.c:1631:17: note: previous implicit declaration of 'dump_buffer_page' with type 'void(struct buffer_data_page *, struct rb_event_info *, long unsigned int)'
1631 | dump_buffer_page(bpage, info, tail); \
| ^~~~~~~~~~~~~~~~
kernel/trace/ring_buffer.c:1667:33: note: in expansion of macro 'buffer_warn_return'
1667 | buffer_warn_return("[CPU: %d]ABSOLUTE TIME WENT BACKWARDS: last ts: %lld absolute ts: %lld\n",
| ^~~~~~~~~~~~~~~~~~
kernel/trace/ring_buffer.c: In function 'check_buffer':
>> kernel/trace/ring_buffer.c:4046:9: error: 'ret' undeclared (first use in this function); did you mean 'net'?
4046 | ret = rb_read_data_buffer(bpage, tail, &ts, cpu_buffer->cpu, true);
| ^~~
| net
>> kernel/trace/ring_buffer.c:4046:48: warning: passing argument 3 of 'rb_read_data_buffer' makes integer from pointer without a cast [-Wint-conversion]
4046 | ret = rb_read_data_buffer(bpage, tail, &ts, cpu_buffer->cpu, true);
| ^~~
| |
| u64 * {aka long long unsigned int *}
kernel/trace/ring_buffer.c:1642:78: note: expected 'int' but argument is of type 'u64 *' {aka 'long long unsigned int *'}
1642 | static int rb_read_data_buffer(struct buffer_data_page *dpage, int tail, int cpu,
| ~~~~^~~
>> kernel/trace/ring_buffer.c:4046:63: warning: passing argument 4 of 'rb_read_data_buffer' makes pointer from integer without a cast [-Wint-conversion]
4046 | ret = rb_read_data_buffer(bpage, tail, &ts, cpu_buffer->cpu, true);
| ~~~~~~~~~~^~~~~
| |
| int
kernel/trace/ring_buffer.c:1643:52: note: expected 'long long unsigned int *' but argument is of type 'int'
1643 | unsigned long long *timestamp, bool warn)
| ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
>> kernel/trace/ring_buffer.c:4020:13: warning: unused variable 'e' [-Wunused-variable]
4020 | int e;
| ^
>> kernel/trace/ring_buffer.c:4018:17: warning: unused variable 'delta' [-Wunused-variable]
4018 | u64 ts, delta;
| ^~~~~
>> kernel/trace/ring_buffer.c:4016:35: warning: unused variable 'event' [-Wunused-variable]
4016 | struct ring_buffer_event *event;
| ^~~~~
cc1: some warnings being treated as errors

vim +/cpu_buffer +1629 kernel/trace/ring_buffer.c

1621
1622 #define buffer_warn_return(fmt, ...) \
1623 do { \
1624 /* If another report is happening, ignore this one */ \
1625 if (atomic_inc_return(&ts_dump) != 1) { \
1626 atomic_dec(&ts_dump); \
1627 goto out; \
1628 } \
> 1629 atomic_inc(&cpu_buffer->record_disabled); \
1630 pr_warn(fmt, ##__VA_ARGS__); \
> 1631 dump_buffer_page(bpage, info, tail); \
1632 atomic_dec(&ts_dump); \
1633 /* There's some cases in boot up that this can happen */ \
1634 if (WARN_ON_ONCE(system_state != SYSTEM_BOOTING)) \
1635 /* Do not re-enable checking */ \
> 1636 return; \
1637 } while (0)
1638 #else
1639 #define buffer_warn_return(fmt, ...) do { } while (0)
1640 #endif
1641
1642 static int rb_read_data_buffer(struct buffer_data_page *dpage, int tail, int cpu,
> 1643 unsigned long long *timestamp, bool warn)
1644 {
1645 struct ring_buffer_event *event;
1646 u64 ts, delta;
1647 int events = 0;
1648 int e;
1649
1650 ts = dpage->time_stamp;
1651
1652 for (e = 0; e < tail; e += rb_event_length(event)) {
1653
1654 event = (struct ring_buffer_event *)(dpage->data + e);
1655
1656 switch (event->type_len) {
1657
1658 case RINGBUF_TYPE_TIME_EXTEND:
1659 delta = rb_event_time_stamp(event);
1660 ts += delta;
1661 break;
1662
1663 case RINGBUF_TYPE_TIME_STAMP:
1664 delta = rb_event_time_stamp(event);
1665 delta = rb_fix_abs_ts(delta, ts);
1666 if (warn && delta < ts) {
> 1667 buffer_warn_return("[CPU: %d]ABSOLUTE TIME WENT BACKWARDS: last ts: %lld absolute ts: %lld\n",
1668 cpu, ts, delta);
1669 }
1670 ts = delta;
1671 break;
1672
1673 case RINGBUF_TYPE_PADDING:
1674 if (event->time_delta == 1)
1675 break;
1676 fallthrough;
1677 case RINGBUF_TYPE_DATA:
1678 events++;
1679 ts += event->time_delta;
1680 break;
1681
1682 default:
1683 return -1;
1684 }
1685 }
1686 *timestamp = ts;
1687 return events;
1688 }
1689

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

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