linux-kernel - Re: [PATCH v12 2/5] fs/proc/task_mmu: Implement IOCTL to get and optionally clear info about PTEs

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Date:   Wed, 7 Jun 2023 10:45:14 +0500
From:   Muhammad Usama Anjum <usama.anjum@...labora.com>
To:     Vineet Gupta <vgupta@...nel.org>,
        linux-snps-arc@...ts.infradead.org
Cc:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        oe-kbuild-all@...ts.linux.dev,
        Linux Memory Management List <linux-mm@...ck.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Christian Brauner <brauner@...nel.org>,
        Yang Shi <shy828301@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Yun Zhou <yun.zhou@...driver.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Alex Sierra <alex.sierra@....com>,
        Matthew Wilcox <willy@...radead.org>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, Greg KH <greg@...ah.com>,
        kernel test robot <lkp@...el.com>,
        Peter Xu <peterx@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michał Mirosław 
        <emmir@...gle.com>, Andrei Vagin <avagin@...il.com>,
        Danylo Mocherniuk <mdanylo@...gle.com>,
        Paul Gofman <pgofman@...eweavers.com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Mike Rapoport <rppt@...nel.org>, Nadav Amit <namit@...are.com>
Subject: Re: [PATCH v12 2/5] fs/proc/task_mmu: Implement IOCTL to get and
 optionally clear info about PTEs

On 4/6/23 5:56 PM, Muhammad Usama Anjum wrote:
> On 4/6/23 4:40 PM, kernel test robot wrote:
>> Hi Muhammad,
>>
>> kernel test robot noticed the following build errors:
>>
>> [auto build test ERROR on akpm-mm/mm-everything]
>> [also build test ERROR on next-20230406]
>> [cannot apply to linus/master v6.3-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/Muhammad-Usama-Anjum/userfaultfd-UFFD_FEATURE_WP_ASYNC/20230406-154314
>> base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
>> patch link:    https://lore.kernel.org/r/20230406074005.1784728-3-usama.anjum%40collabora.com
>> patch subject: [PATCH v12 2/5] fs/proc/task_mmu: Implement IOCTL to get and optionally clear info about PTEs
>> config: arc-randconfig-r023-20230405 (https://download.01.org/0day-ci/archive/20230406/202304061914.N1Hmx12N-lkp@intel.com/config)
>> compiler: arceb-elf-gcc (GCC) 12.1.0
>> reproduce (this is a W=1 build):
>>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>         chmod +x ~/bin/make.cross
>>         # https://github.com/intel-lab-lkp/linux/commit/f13abb36f64c77913509da8ca157512d2fb9f031
>>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>>         git fetch --no-tags linux-review Muhammad-Usama-Anjum/userfaultfd-UFFD_FEATURE_WP_ASYNC/20230406-154314
>>         git checkout f13abb36f64c77913509da8ca157512d2fb9f031
>>         # save the config file
>>         mkdir build_dir && cp config build_dir/.config
>>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arc olddefconfig
>>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash fs/proc/
>>
>> If you fix the issue, kindly add following tag where applicable
>> | Reported-by: kernel test robot <lkp@...el.com>
>> | Link: https://lore.kernel.org/oe-kbuild-all/202304061914.N1Hmx12N-lkp@intel.com/
>>
>> All error/warnings (new ones prefixed by >>):
>>
>>    fs/proc/task_mmu.c: In function 'pagemap_scan_pmd_entry':
>>>> fs/proc/task_mmu.c:1921:37: error: 'HPAGE_SIZE' undeclared (first use in this function); did you mean 'PAGE_SIZE'?
>>     1921 |                     ((end - start < HPAGE_SIZE) ||
>>          |                                     ^~~~~~~~~~
>>          |                                     PAGE_SIZE
> It seems arc architecture supports CONFIG_TRANSPARENT_HUGEPAGE, but it
> doesn't define HPAGE_SIZE. It only defines PAGE_SIZE in
> include/uapi/asm/page.h? AFAIK HPAGE_SIZE must be defined when
> CONFIG_TRANSPARENT_HUGEPAGE is enabled. What can be the solution here for arc?
I'm still looking for solution. Vineet do you have some thoughts?

> 
> The remaining build failures are because the wrong tree. I base my patches
> on latest next, while the bot has based patches on mm-everything. I guess
> today's next would have latest mm stuff, a rebase would make things correct
> or I'll shift to mm-everything.
> 
> 

-- 
BR,
Muhammad Usama Anjum