linux-kernel - Re: [PATCH v3] Avoid memory barrier in read

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Message-ID: <202409132135.ki3Mp5EA-lkp@intel.com>
Date: Fri, 13 Sep 2024 21:41:15 +0800
From: kernel test robot <lkp@...el.com>
To: Christoph Lameter via B4 Relay <devnull+cl.gentwo.org@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Waiman Long <longman@...hat.com>,
	Boqun Feng <boqun.feng@...il.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-arch@...r.kernel.org,
	"Christoph Lameter (Ampere)" <cl@...two.org>
Subject: Re: [PATCH v3] Avoid memory barrier in read_seqcount() through load
 acquire

Hi Christoph,

kernel test robot noticed the following build errors:

[auto build test ERROR on 77f587896757708780a7e8792efe62939f25a5ab]

url:    https://github.com/intel-lab-lkp/linux/commits/Christoph-Lameter-via-B4-Relay/Avoid-memory-barrier-in-read_seqcount-through-load-acquire/20240913-064557
base:   77f587896757708780a7e8792efe62939f25a5ab
patch link:    https://lore.kernel.org/r/20240912-seq_optimize-v3-1-8ee25e04dffa%40gentwo.org
patch subject: [PATCH v3] Avoid memory barrier in read_seqcount() through load acquire
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20240913/202409132135.ki3Mp5EA-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240913/202409132135.ki3Mp5EA-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409132135.ki3Mp5EA-lkp@intel.com/

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

   In file included from drivers/gpu/drm/i915/gt/intel_gt.c:36:
   drivers/gpu/drm/i915/gt/intel_tlb.h: In function 'intel_gt_tlb_seqno':
>> drivers/gpu/drm/i915/gt/intel_tlb.h:21:47: error: macro "seqprop_sequence" requires 2 arguments, but only 1 given
      21 |         return seqprop_sequence(&gt->tlb.seqno);
         |                                               ^
   In file included from include/linux/mmzone.h:17,
                    from include/linux/gfp.h:7,
                    from include/drm/drm_managed.h:6,
                    from drivers/gpu/drm/i915/gt/intel_gt.c:6:
   include/linux/seqlock.h:280: note: macro "seqprop_sequence" defined here
     280 | #define seqprop_sequence(s, a)          __seqprop(s, sequence)(s, a)
         | 
   In file included from drivers/gpu/drm/i915/gt/intel_gt.c:36:
>> drivers/gpu/drm/i915/gt/intel_tlb.h:21:16: error: 'seqprop_sequence' undeclared (first use in this function)
      21 |         return seqprop_sequence(&gt->tlb.seqno);
         |                ^~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/gt/intel_tlb.h:21:16: note: each undeclared identifier is reported only once for each function it appears in
--
   In file included from drivers/gpu/drm/i915/gt/intel_tlb.c:14:
   drivers/gpu/drm/i915/gt/intel_tlb.h: In function 'intel_gt_tlb_seqno':
>> drivers/gpu/drm/i915/gt/intel_tlb.h:21:47: error: macro "seqprop_sequence" requires 2 arguments, but only 1 given
      21 |         return seqprop_sequence(&gt->tlb.seqno);
         |                                               ^
   In file included from include/linux/mmzone.h:17,
                    from include/linux/gfp.h:7,
                    from include/linux/xarray.h:16,
                    from include/linux/radix-tree.h:21,
                    from include/linux/idr.h:15,
                    from include/linux/kernfs.h:12,
                    from include/linux/sysfs.h:16,
                    from include/linux/kobject.h:20,
                    from include/linux/energy_model.h:7,
                    from include/linux/device.h:16,
                    from include/linux/pm_qos.h:17,
                    from drivers/gpu/drm/i915/i915_drv.h:35,
                    from drivers/gpu/drm/i915/gt/intel_tlb.c:6:
   include/linux/seqlock.h:280: note: macro "seqprop_sequence" defined here
     280 | #define seqprop_sequence(s, a)          __seqprop(s, sequence)(s, a)
         | 
   In file included from drivers/gpu/drm/i915/gt/intel_tlb.c:14:
>> drivers/gpu/drm/i915/gt/intel_tlb.h:21:16: error: 'seqprop_sequence' undeclared (first use in this function)
      21 |         return seqprop_sequence(&gt->tlb.seqno);
         |                ^~~~~~~~~~~~~~~~
   drivers/gpu/drm/i915/gt/intel_tlb.h:21:16: note: each undeclared identifier is reported only once for each function it appears in
>> drivers/gpu/drm/i915/gt/intel_tlb.h:22:1: warning: control reaches end of non-void function [-Wreturn-type]
      22 | }
         | ^


vim +/seqprop_sequence +21 drivers/gpu/drm/i915/gt/intel_tlb.h

568a2e6f0b12ee Chris Wilson 2023-08-01  18  
568a2e6f0b12ee Chris Wilson 2023-08-01  19  static inline u32 intel_gt_tlb_seqno(const struct intel_gt *gt)
568a2e6f0b12ee Chris Wilson 2023-08-01  20  {
568a2e6f0b12ee Chris Wilson 2023-08-01 @21  	return seqprop_sequence(&gt->tlb.seqno);
568a2e6f0b12ee Chris Wilson 2023-08-01 @22  }
568a2e6f0b12ee Chris Wilson 2023-08-01  23  

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