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From:   Michel Lespinasse <walken@google.com>
Date:   Tue, 21 Apr 2020 15:19:48 -0700
Message-ID: <CANN689FB5M591_xcJC6M_5n3HMJk8nrYnV_Wepnnt85v0PK4ZQ@mail.gmail.com>
Subject: Re: [PATCH v4 10/10] mmap locking API: rename mmap_sem to mmap_lock
To:     kbuild test robot <lkp@intel.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>, kbuild-all@lists.01.org,
        Linux Memory Management List <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Laurent Dufour <ldufour@linux.ibm.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Matthew Wilcox <willy@infradead.org>,
        Liam Howlett <Liam.Howlett@oracle.com>,
        Jerome Glisse <jglisse@redhat.com>,
        Davidlohr Bueso <dave@stgolabs.net>,
        David Rientjes <rientjes@google.com>
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Thanks for the report. It's an easy fix, which I will fold into change
05/10 of the series.

On Mon, Apr 20, 2020 at 10:34 PM kbuild test robot <lkp@intel.com> wrote:
>
> Hi Michel,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on rdma/for-next]
> [also build test ERROR on kvms390/next linus/master v5.7-rc2]
> [cannot apply to powerpc/next uml/linux-next next-20200420]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
>
> url:    https://github.com/0day-ci/linux/commits/Michel-Lespinasse/Add-a-new-mmap-locking-API-wrapping-mmap_sem-calls/20200415-084649
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git for-next
> config: riscv-randconfig-a001-20200421 (attached as .config)
> compiler: riscv64-linux-gcc (GCC) 9.3.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=riscv
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@intel.com>
>
> All errors (new ones prefixed by >>):
>
>    arch/riscv/mm/pageattr.c: In function '__set_memory':
> >> arch/riscv/mm/pageattr.c:120:21: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_base'?
>      120 |  down_read(&init_mm.mmap_sem);
>          |                     ^~~~~~~~
>          |                     mmap_base
>    arch/riscv/mm/pageattr.c:123:19: error: 'struct mm_struct' has no member named 'mmap_sem'; did you mean 'mmap_base'?
>      123 |  up_read(&init_mm.mmap_sem);
>          |                   ^~~~~~~~
>          |                   mmap_base
>
> vim +120 arch/riscv/mm/pageattr.c
>
> d3ab332a502123 Zong Li 2020-03-10  105
> d3ab332a502123 Zong Li 2020-03-10  106  static int __set_memory(unsigned long addr, int numpages, pgprot_t set_mask,
> d3ab332a502123 Zong Li 2020-03-10  107                          pgprot_t clear_mask)
> d3ab332a502123 Zong Li 2020-03-10  108  {
> d3ab332a502123 Zong Li 2020-03-10  109          int ret;
> d3ab332a502123 Zong Li 2020-03-10  110          unsigned long start = addr;
> d3ab332a502123 Zong Li 2020-03-10  111          unsigned long end = start + PAGE_SIZE * numpages;
> d3ab332a502123 Zong Li 2020-03-10  112          struct pageattr_masks masks = {
> d3ab332a502123 Zong Li 2020-03-10  113                  .set_mask = set_mask,
> d3ab332a502123 Zong Li 2020-03-10  114                  .clear_mask = clear_mask
> d3ab332a502123 Zong Li 2020-03-10  115          };
> d3ab332a502123 Zong Li 2020-03-10  116
> d3ab332a502123 Zong Li 2020-03-10  117          if (!numpages)
> d3ab332a502123 Zong Li 2020-03-10  118                  return 0;
> d3ab332a502123 Zong Li 2020-03-10  119
> d3ab332a502123 Zong Li 2020-03-10 @120          down_read(&init_mm.mmap_sem);
> d3ab332a502123 Zong Li 2020-03-10  121          ret =  walk_page_range_novma(&init_mm, start, end, &pageattr_ops, NULL,
> d3ab332a502123 Zong Li 2020-03-10  122                                       &masks);
> d3ab332a502123 Zong Li 2020-03-10  123          up_read(&init_mm.mmap_sem);
> d3ab332a502123 Zong Li 2020-03-10  124
> d3ab332a502123 Zong Li 2020-03-10  125          flush_tlb_kernel_range(start, end);
> d3ab332a502123 Zong Li 2020-03-10  126
> d3ab332a502123 Zong Li 2020-03-10  127          return ret;
> d3ab332a502123 Zong Li 2020-03-10  128  }
> d3ab332a502123 Zong Li 2020-03-10  129
>
> :::::: The code at line 120 was first introduced by commit
> :::::: d3ab332a5021235a74fd832a49c6a99404920d88 riscv: add ARCH_HAS_SET_MEMORY support
>
> :::::: TO: Zong Li <zong.li@sifive.com>
> :::::: CC: Palmer Dabbelt <palmerdabbelt@google.com>
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org


-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.