From: kernel test robot <lkp@intel.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: kernel/trace/ring_buffer.c:412:29-47: WARNING: casting value returned by memory allocation function to (struct buffer_page *) is useless.
Date: Sat, 01 Aug 2026 08:10:14 +0800 [thread overview]
Message-ID: <202608010824.vc7vATf0-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 8ba098e6b6ff0db8edf28528d1552be261af30d4
commit: b1e7a590a0133606d3efd41aee38cdeac630b52f ring-buffer: Add helper functions for allocations
date: 8 months ago
config: openrisc-randconfig-r062-20260801 (https://download.01.org/0day-ci/archive/20260801/202608010824.vc7vATf0-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 9.5.0
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
| Fixes: b1e7a590a013 ("ring-buffer: Add helper functions for allocations")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608010824.vc7vATf0-lkp@intel.com/
cocci warnings: (new ones prefixed by >>)
>> kernel/trace/ring_buffer.c:412:29-47: WARNING: casting value returned by memory allocation function to (struct buffer_page *) is useless.
>> kernel/trace/ring_buffer.c:408:31-57: WARNING: casting value returned by memory allocation function to (struct ring_buffer_per_cpu *) is useless.
vim +412 kernel/trace/ring_buffer.c
403
404 /*
405 * For best performance, allocate cpu buffer data cache line sized
406 * and per CPU.
407 */
> 408 #define alloc_cpu_buffer(cpu) (struct ring_buffer_per_cpu *) \
409 kzalloc_node(ALIGN(sizeof(struct ring_buffer_per_cpu), \
410 cache_line_size()), GFP_KERNEL, cpu_to_node(cpu));
411
> 412 #define alloc_cpu_page(cpu) (struct buffer_page *) \
413 kzalloc_node(ALIGN(sizeof(struct buffer_page), \
414 cache_line_size()), GFP_KERNEL, cpu_to_node(cpu));
415
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next reply other threads:[~2026-08-01 0:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-01 0:10 kernel test robot [this message]
2026-08-01 0:28 ` kernel/trace/ring_buffer.c:412:29-47: WARNING: casting value returned by memory allocation function to (struct buffer_page *) is useless Steven Rostedt
2026-08-01 7:05 ` Julia Lawall
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