Re: [PATCH 1/2] x86: Remove the prefetch() specific implementation on x86_64

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

Hi Youling,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/master]
[also build test ERROR on linus/master v6.10-rc1 next-20240529]
[cannot apply to tip/auto-latest tip/x86/core bp/for-next]
[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/Youling-Tang/prefetch-Add-ARCH_HAS_PREFETCH-definition-when-the-architecture-is-not-defined/20240529-112345
base:   tip/master
patch link:    https://lore.kernel.org/r/20240529032059.899347-1-youling.tang%40linux.dev
patch subject: [PATCH 1/2] x86: Remove the prefetch() specific implementation on x86_64
config: x86_64-buildonly-randconfig-006-20240530 (https://download.01.org/0day-ci/archive/20240530/202405300328.eZmSYZrP-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240530/202405300328.eZmSYZrP-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/202405300328.eZmSYZrP-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/soc/fsl/dpio/dpio-service.c: In function 'dpaa2_io_store_next':
>> drivers/soc/fsl/dpio/dpio-service.c:745:17: error: implicit declaration of function 'prefetch'; did you mean 'prefetchw'? [-Werror=implicit-function-declaration]
     745 |                 prefetch(&s->vaddr[s->idx]);
         |                 ^~~~~~~~
         |                 prefetchw
   cc1: some warnings being treated as errors
--
   drivers/soc/fsl/dpio/qbman-portal.c: In function 'qbman_swp_dqrr_next_direct':
>> drivers/soc/fsl/dpio/qbman-portal.c:1213:17: error: implicit declaration of function 'prefetch'; did you mean 'prefetchw'? [-Werror=implicit-function-declaration]
    1213 |                 prefetch(qbman_get_cmd(s,
         |                 ^~~~~~~~
         |                 prefetchw
   cc1: some warnings being treated as errors


vim +745 drivers/soc/fsl/dpio/dpio-service.c

780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  703  
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  704  /**
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  705   * dpaa2_io_store_next() - Determine when the next dequeue result is available.
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  706   * @s: the dpaa2_io_store object.
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  707   * @is_last: indicate whether this is the last frame in the pull command.
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  708   *
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  709   * When an object driver performs dequeues to a dpaa2_io_store, this function
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  710   * can be used to determine when the next frame result is available. Once
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  711   * this function returns non-NULL, a subsequent call to it will try to find
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  712   * the next dequeue result.
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  713   *
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  714   * Note that if a pull-dequeue has a NULL result because the target FQ/channel
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  715   * was empty, then this function will also return NULL (rather than expecting
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  716   * the caller to always check for this. As such, "is_last" can be used to
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  717   * differentiate between "end-of-empty-dequeue" and "still-waiting".
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  718   *
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  719   * Return dequeue result for a valid dequeue result, or NULL for empty dequeue.
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  720   */
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  721  struct dpaa2_dq *dpaa2_io_store_next(struct dpaa2_io_store *s, int *is_last)
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  722  {
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  723  	int match;
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  724  	struct dpaa2_dq *ret = &s->vaddr[s->idx];
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  725  
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  726  	match = qbman_result_has_new_result(s->swp, ret);
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  727  	if (!match) {
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  728  		*is_last = 0;
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  729  		return NULL;
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  730  	}
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  731  
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  732  	s->idx++;
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  733  
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  734  	if (dpaa2_dq_is_pull_complete(ret)) {
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  735  		*is_last = 1;
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  736  		s->idx = 0;
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  737  		/*
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  738  		 * If we get an empty dequeue result to terminate a zero-results
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  739  		 * vdqcr, return NULL to the caller rather than expecting him to
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  740  		 * check non-NULL results every time.
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  741  		 */
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  742  		if (!(dpaa2_dq_flags(ret) & DPAA2_DQ_STAT_VALIDFRAME))
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  743  			ret = NULL;
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  744  	} else {
f1e250bf365962 drivers/soc/fsl/dpio/dpio-service.c            Ioana Ciocoi Radulescu 2018-12-14 @745  		prefetch(&s->vaddr[s->idx]);
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  746  		*is_last = 0;
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  747  	}
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  748  
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  749  	return ret;
780b626323d721 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Roy Pledge             2017-03-13  750  }
53639c64c686f0 drivers/staging/fsl-mc/bus/dpio/dpio-service.c Laurentiu Tudor        2017-11-17  751  EXPORT_SYMBOL_GPL(dpaa2_io_store_next);
e80081c34b0358 drivers/soc/fsl/dpio/dpio-service.c            Roy Pledge             2018-12-18  752  

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