Re: [PATCH] [RFC] mm: add kmem_cache_create_rcu()

[kernel test robot <lkp@intel.com>]

Hi Christian,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build warnings:

[auto build test WARNING on next-20240826]
[cannot apply to akpm-mm/mm-everything linus/master vbabka-slab/for-next v6.11-rc5 v6.11-rc4 v6.11-rc3 v6.11-rc5]
[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/Christian-Brauner/mm-add-kmem_cache_create_rcu/20240827-001335
base:   next-20240826
patch link:    https://lore.kernel.org/r/20240826-okkupieren-nachdenken-d88ac627e9bc%40brauner
patch subject: [PATCH] [RFC] mm: add kmem_cache_create_rcu()
config: openrisc-allnoconfig (https://download.01.org/0day-ci/archive/20240830/202408301614.aLcb90z7-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240830/202408301614.aLcb90z7-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/202408301614.aLcb90z7-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/slab_common.c:299: warning: Function parameter or struct member 'offset' not described in 'do_kmem_cache_create_usercopy'
>> mm/slab_common.c:299: warning: expecting prototype for kmem_cache_create_usercopy(). Prototype was for do_kmem_cache_create_usercopy() instead


vim +299 mm/slab_common.c

4590685546a374 Christoph Lameter 2012-11-28  264  
f496990f1f4b1d Mike Rapoport     2018-12-06  265  /**
f496990f1f4b1d Mike Rapoport     2018-12-06  266   * kmem_cache_create_usercopy - Create a cache with a region suitable
f496990f1f4b1d Mike Rapoport     2018-12-06  267   * for copying to userspace
039363f38bfe5f Christoph Lameter 2012-07-06  268   * @name: A string which is used in /proc/slabinfo to identify this cache.
039363f38bfe5f Christoph Lameter 2012-07-06  269   * @size: The size of objects to be created in this cache.
039363f38bfe5f Christoph Lameter 2012-07-06  270   * @align: The required alignment for the objects.
039363f38bfe5f Christoph Lameter 2012-07-06  271   * @flags: SLAB flags
8eb8284b412906 David Windsor     2017-06-10  272   * @useroffset: Usercopy region offset
8eb8284b412906 David Windsor     2017-06-10  273   * @usersize: Usercopy region size
039363f38bfe5f Christoph Lameter 2012-07-06  274   * @ctor: A constructor for the objects.
039363f38bfe5f Christoph Lameter 2012-07-06  275   *
039363f38bfe5f Christoph Lameter 2012-07-06  276   * Cannot be called within a interrupt, but can be interrupted.
039363f38bfe5f Christoph Lameter 2012-07-06  277   * The @ctor is run when new pages are allocated by the cache.
039363f38bfe5f Christoph Lameter 2012-07-06  278   *
039363f38bfe5f Christoph Lameter 2012-07-06  279   * The flags are
039363f38bfe5f Christoph Lameter 2012-07-06  280   *
039363f38bfe5f Christoph Lameter 2012-07-06  281   * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
039363f38bfe5f Christoph Lameter 2012-07-06  282   * to catch references to uninitialised memory.
039363f38bfe5f Christoph Lameter 2012-07-06  283   *
f496990f1f4b1d Mike Rapoport     2018-12-06  284   * %SLAB_RED_ZONE - Insert `Red` zones around the allocated memory to check
039363f38bfe5f Christoph Lameter 2012-07-06  285   * for buffer overruns.
039363f38bfe5f Christoph Lameter 2012-07-06  286   *
039363f38bfe5f Christoph Lameter 2012-07-06  287   * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware
039363f38bfe5f Christoph Lameter 2012-07-06  288   * cacheline.  This can be beneficial if you're counting cycles as closely
039363f38bfe5f Christoph Lameter 2012-07-06  289   * as davem.
f496990f1f4b1d Mike Rapoport     2018-12-06  290   *
f496990f1f4b1d Mike Rapoport     2018-12-06  291   * Return: a pointer to the cache on success, NULL on failure.
039363f38bfe5f Christoph Lameter 2012-07-06  292   */
e09e2ae041c2e3 Christian Brauner 2024-08-26  293  static struct kmem_cache *
e09e2ae041c2e3 Christian Brauner 2024-08-26  294  do_kmem_cache_create_usercopy(const char *name,
e09e2ae041c2e3 Christian Brauner 2024-08-26  295  		  unsigned int size, unsigned int offset,
e09e2ae041c2e3 Christian Brauner 2024-08-26  296  		  unsigned int align, slab_flags_t flags,
7bbdb81ee3de73 Alexey Dobriyan   2018-04-05  297  		  unsigned int useroffset, unsigned int usersize,
8eb8284b412906 David Windsor     2017-06-10  298  		  void (*ctor)(void *))
039363f38bfe5f Christoph Lameter 2012-07-06 @299  {
40911a798b5abb Alexandru Moise   2015-11-05  300  	struct kmem_cache *s = NULL;
3dec16ea38afce Andrzej Hajda     2015-02-13  301  	const char *cache_name;
3965fc36522446 Vladimir Davydov  2014-01-23  302  	int err;
039363f38bfe5f Christoph Lameter 2012-07-06  303  

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