linux-kernel - RE: [PATCH] md/raid6 algorithms: scale test duration for speedier boots

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Message-ID: <CY8PR11MB774743159DA70F6BF601FF0F8DBF2@CY8PR11MB7747.namprd11.prod.outlook.com>
Date: Tue, 6 Aug 2024 21:28:54 +0000
From: "King, Colin" <colin.king@...el.com>
To: lkp <lkp@...el.com>, Andrew Morton <akpm@...ux-foundation.org>, "Masahiro
 Yamada" <masahiroy@...nel.org>, "rppt@...nel.org" <rppt@...nel.org>
CC: "oe-kbuild-all@...ts.linux.dev" <oe-kbuild-all@...ts.linux.dev>, "Linux
 Memory Management List" <linux-mm@...ck.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] md/raid6 algorithms: scale test duration for speedier
 boots

Hi,

Two issues with the patch, firstly the 64 bit divisions should be using div64_u64() and also on i386 testing in a VM the selection of the raid6 avx2* algorithm is sometimes incorrect because of a difference in benchmark speed rates on avx2x2 and avx2x1 - so I think this patch needs to be reverted/removed for now until I can figure out why it's not fully stable.

Colin

-----Original Message-----
From: lkp <lkp@...el.com> 
Sent: Tuesday, August 6, 2024 5:01 AM
To: King, Colin <colin.king@...el.com>; Andrew Morton <akpm@...ux-foundation.org>; Masahiro Yamada <masahiroy@...nel.org>; rppt@...nel.org
Cc: oe-kbuild-all@...ts.linux.dev; Linux Memory Management List <linux-mm@...ck.org>; linux-kernel@...r.kernel.org
Subject: Re: [PATCH] md/raid6 algorithms: scale test duration for speedier boots

Hi Colin,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-nonmm-unstable] [also build test ERROR on akpm-mm/mm-everything linus/master v6.11-rc2 next-20240805] [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/Colin-Ian-King/md-raid6-algorithms-scale-test-duration-for-speedier-boots/20240806-012444
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-nonmm-unstable
patch link:    https://lore.kernel.org/r/20240805170816.6025-1-colin.king%40intel.com
patch subject: [PATCH] md/raid6 algorithms: scale test duration for speedier boots
config: i386-buildonly-randconfig-002-20240806 (https://download.01.org/0day-ci/archive/20240806/202408061134.O5o8RpVV-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240806/202408061134.O5o8RpVV-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/202408061134.O5o8RpVV-lkp@intel.
| com/

All errors (new ones prefixed by >>):

   ld: lib/raid6/algos.o: in function `raid6_choose_gen.constprop.0':
>> algos.c:(.text+0xe6): undefined reference to `__udivdi3'
>> ld: algos.c:(.text+0x163): undefined reference to `__udivdi3'
   ld: algos.c:(.text+0x1fd): undefined reference to `__udivdi3'

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