* [android-common:android15-6.6-2025-10 0/1] kernel/trace/ring_buffer.c:1821: warning: Function parameter or member 'writer' not described in '__ring_buffer_alloc'
@ 2026-07-08 14:15 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-07-08 14:15 UTC (permalink / raw)
To: cros-kernel-buildreports; +Cc: oe-kbuild-all
Hi Vincent,
FYI, the error/warning still remains.
tree: https://android.googlesource.com/kernel/common android15-6.6-2025-10
head: a03fb833a7fa2cc2276b3c45eb0672ecb2ca3234
commit: bc115ff00f4cd4d21ddf7e6e200f389d81acc69e [0/1] ANDROID: ring-buffer: Introducing ring-buffer writer
config: i386-buildonly-randconfig-004-20260708 (https://download.01.org/0day-ci/archive/20260708/202607082235.y5EhJi3s-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.4.0-5) 12.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260708/202607082235.y5EhJi3s-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/202607082235.y5EhJi3s-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> kernel/trace/ring_buffer.c:1821: warning: Function parameter or member 'writer' not described in '__ring_buffer_alloc'
vim +1821 kernel/trace/ring_buffer.c
7a8e76a3829f10 Steven Rostedt 2008-09-29 1806
7a8e76a3829f10 Steven Rostedt 2008-09-29 1807 /**
d611851b421731 zhangwei(Jovi 2013-07-15 1808) * __ring_buffer_alloc - allocate a new ring_buffer
68814b58c52077 Robert Richter 2008-11-24 1809 * @size: the size in bytes per cpu that is needed.
7a8e76a3829f10 Steven Rostedt 2008-09-29 1810 * @flags: attributes to set for the ring buffer.
59e7cffe5cca6f Fabian Frederick 2014-06-05 1811 * @key: ring buffer reader_lock_key.
7a8e76a3829f10 Steven Rostedt 2008-09-29 1812 *
7a8e76a3829f10 Steven Rostedt 2008-09-29 1813 * Currently the only flag that is available is the RB_FL_OVERWRITE
7a8e76a3829f10 Steven Rostedt 2008-09-29 1814 * flag. This flag means that the buffer will overwrite old data
7a8e76a3829f10 Steven Rostedt 2008-09-29 1815 * when the buffer wraps. If this flag is not set, the buffer will
7a8e76a3829f10 Steven Rostedt 2008-09-29 1816 * drop data when the tail hits the head.
7a8e76a3829f10 Steven Rostedt 2008-09-29 1817 */
13292494379f92 Steven Rostedt (VMware 2019-12-13 1818) struct trace_buffer *__ring_buffer_alloc(unsigned long size, unsigned flags,
bc115ff00f4cd4 Vincent Donnefort 2023-06-09 1819 struct lock_class_key *key,
bc115ff00f4cd4 Vincent Donnefort 2023-06-09 1820 struct ring_buffer_writer *writer)
7a8e76a3829f10 Steven Rostedt 2008-09-29 @1821 {
13292494379f92 Steven Rostedt (VMware 2019-12-13 1822) struct trace_buffer *buffer;
9b94a8fba501f3 Steven Rostedt (Red Hat 2016-05-12 1823) long nr_pages;
7a8e76a3829f10 Steven Rostedt 2008-09-29 1824 int bsize;
9b94a8fba501f3 Steven Rostedt (Red Hat 2016-05-12 1825) int cpu;
b32614c03413f8 Sebastian Andrzej Siewior 2016-11-27 1826 int ret;
7a8e76a3829f10 Steven Rostedt 2008-09-29 1827
7a8e76a3829f10 Steven Rostedt 2008-09-29 1828 /* keep it in its own cache line */
7a8e76a3829f10 Steven Rostedt 2008-09-29 1829 buffer = kzalloc(ALIGN(sizeof(*buffer), cache_line_size()),
7a8e76a3829f10 Steven Rostedt 2008-09-29 1830 GFP_KERNEL);
7a8e76a3829f10 Steven Rostedt 2008-09-29 1831 if (!buffer)
7a8e76a3829f10 Steven Rostedt 2008-09-29 1832 return NULL;
7a8e76a3829f10 Steven Rostedt 2008-09-29 1833
b18cc3de00ec34 Sebastian Andrzej Siewior 2016-12-07 1834 if (!zalloc_cpumask_var(&buffer->cpumask, GFP_KERNEL))
9e01c1b74c9531 Rusty Russell 2009-01-01 1835 goto fail_free_buffer;
9e01c1b74c9531 Rusty Russell 2009-01-01 1836
438ced1720b584 Vaibhav Nagarnaik 2012-02-02 1837 nr_pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
7a8e76a3829f10 Steven Rostedt 2008-09-29 1838 buffer->flags = flags;
37886f6a9f62d2 Steven Rostedt 2009-03-17 1839 buffer->clock = trace_clock_local;
1f8a6a10fb9437 Peter Zijlstra 2009-06-08 1840 buffer->reader_lock_key = key;
bc115ff00f4cd4 Vincent Donnefort 2023-06-09 1841 if (writer) {
bc115ff00f4cd4 Vincent Donnefort 2023-06-09 1842 buffer->writer = writer;
bc115ff00f4cd4 Vincent Donnefort 2023-06-09 1843 atomic_inc(&buffer->record_disabled);
bc115ff00f4cd4 Vincent Donnefort 2023-06-09 1844 }
7a8e76a3829f10 Steven Rostedt 2008-09-29 1845
15693458c4bc06 Steven Rostedt (Red Hat 2013-02-28 1846) init_irq_work(&buffer->irq_work.work, rb_wake_up_waiters);
f1dc6725882b5c Steven Rostedt (Red Hat 2013-03-04 1847) init_waitqueue_head(&buffer->irq_work.waiters);
15693458c4bc06 Steven Rostedt (Red Hat 2013-02-28 1848)
7a8e76a3829f10 Steven Rostedt 2008-09-29 1849 /* need at least two pages */
438ced1720b584 Vaibhav Nagarnaik 2012-02-02 1850 if (nr_pages < 2)
438ced1720b584 Vaibhav Nagarnaik 2012-02-02 1851 nr_pages = 2;
7a8e76a3829f10 Steven Rostedt 2008-09-29 1852
7a8e76a3829f10 Steven Rostedt 2008-09-29 1853 buffer->cpus = nr_cpu_ids;
7a8e76a3829f10 Steven Rostedt 2008-09-29 1854
7a8e76a3829f10 Steven Rostedt 2008-09-29 1855 bsize = sizeof(void *) * nr_cpu_ids;
7a8e76a3829f10 Steven Rostedt 2008-09-29 1856 buffer->buffers = kzalloc(ALIGN(bsize, cache_line_size()),
7a8e76a3829f10 Steven Rostedt 2008-09-29 1857 GFP_KERNEL);
7a8e76a3829f10 Steven Rostedt 2008-09-29 1858 if (!buffer->buffers)
9e01c1b74c9531 Rusty Russell 2009-01-01 1859 goto fail_free_cpumask;
7a8e76a3829f10 Steven Rostedt 2008-09-29 1860
b32614c03413f8 Sebastian Andrzej Siewior 2016-11-27 1861 cpu = raw_smp_processor_id();
b32614c03413f8 Sebastian Andrzej Siewior 2016-11-27 1862 cpumask_set_cpu(cpu, buffer->cpumask);
b32614c03413f8 Sebastian Andrzej Siewior 2016-11-27 1863 buffer->buffers[cpu] = rb_allocate_cpu_buffer(buffer, nr_pages, cpu);
7a8e76a3829f10 Steven Rostedt 2008-09-29 1864 if (!buffer->buffers[cpu])
7a8e76a3829f10 Steven Rostedt 2008-09-29 1865 goto fail_free_buffers;
7a8e76a3829f10 Steven Rostedt 2008-09-29 1866
b32614c03413f8 Sebastian Andrzej Siewior 2016-11-27 1867 ret = cpuhp_state_add_instance(CPUHP_TRACE_RB_PREPARE, &buffer->node);
b32614c03413f8 Sebastian Andrzej Siewior 2016-11-27 1868 if (ret < 0)
b32614c03413f8 Sebastian Andrzej Siewior 2016-11-27 1869 goto fail_free_buffers;
554f786e284a6c Steven Rostedt 2009-03-11 1870
7a8e76a3829f10 Steven Rostedt 2008-09-29 1871 mutex_init(&buffer->mutex);
7a8e76a3829f10 Steven Rostedt 2008-09-29 1872
7a8e76a3829f10 Steven Rostedt 2008-09-29 1873 return buffer;
7a8e76a3829f10 Steven Rostedt 2008-09-29 1874
7a8e76a3829f10 Steven Rostedt 2008-09-29 1875 fail_free_buffers:
7a8e76a3829f10 Steven Rostedt 2008-09-29 1876 for_each_buffer_cpu(buffer, cpu) {
7a8e76a3829f10 Steven Rostedt 2008-09-29 1877 if (buffer->buffers[cpu])
7a8e76a3829f10 Steven Rostedt 2008-09-29 1878 rb_free_cpu_buffer(buffer->buffers[cpu]);
7a8e76a3829f10 Steven Rostedt 2008-09-29 1879 }
7a8e76a3829f10 Steven Rostedt 2008-09-29 1880 kfree(buffer->buffers);
7a8e76a3829f10 Steven Rostedt 2008-09-29 1881
9e01c1b74c9531 Rusty Russell 2009-01-01 1882 fail_free_cpumask:
9e01c1b74c9531 Rusty Russell 2009-01-01 1883 free_cpumask_var(buffer->cpumask);
9e01c1b74c9531 Rusty Russell 2009-01-01 1884
7a8e76a3829f10 Steven Rostedt 2008-09-29 1885 fail_free_buffer:
7a8e76a3829f10 Steven Rostedt 2008-09-29 1886 kfree(buffer);
7a8e76a3829f10 Steven Rostedt 2008-09-29 1887 return NULL;
7a8e76a3829f10 Steven Rostedt 2008-09-29 1888 }
1f8a6a10fb9437 Peter Zijlstra 2009-06-08 1889 EXPORT_SYMBOL_GPL(__ring_buffer_alloc);
7a8e76a3829f10 Steven Rostedt 2008-09-29 1890
:::::: The code at line 1821 was first introduced by commit
:::::: 7a8e76a3829f1067b70f715771ff88baf2fbf3c3 tracing: unified trace buffer
:::::: TO: Steven Rostedt <rostedt@goodmis.org>
:::::: CC: Ingo Molnar <mingo@elte.hu>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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2026-07-08 14:15 [android-common:android15-6.6-2025-10 0/1] kernel/trace/ring_buffer.c:1821: warning: Function parameter or member 'writer' not described in '__ring_buffer_alloc' kernel test robot
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