[PATCH v2 1/4] hmm: Device exclusive memory access
Alistair Popple
apopple at nvidia.com
Fri Feb 19 04:29:38 UTC 2021
Apologies for the noise, looks like I don't have a CONFIG_DEVICE_PRIVATE=n
build in my tests and missed creating definitions for the new static inline
functions for that configuration.
I'll wait for some feedback on the overall approach and fix this in a v3.
- Alistair
On Friday, 19 February 2021 3:04:07 PM AEDT kernel test robot wrote:
> External email: Use caution opening links or attachments
>
>
> Hi Alistair,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on kselftest/next]
> [also build test ERROR on linus/master v5.11 next-20210218]
> [cannot apply to hnaz-linux-mm/master]
> [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]
>
> url: https://github.com/0day-ci/linux/commits/Alistair-Popple/Add-support-for-SVM-atomics-in-Nouveau/20210219-100858
> base: https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git next
> config: mips-randconfig-r036-20210218 (attached as .config)
> compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project
c9439ca36342fb6013187d0a69aef92736951476)
> 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
> # install mips cross compiling tool for clang build
> # apt-get install binutils-mips-linux-gnu
> # https://github.com/0day-ci/linux/commit/
bb5444811772d30b2e3bbaa44baeb8a4b3f03cec
> git remote add linux-review https://github.com/0day-ci/linux
> git fetch --no-tags linux-review Alistair-Popple/Add-support-for-
SVM-atomics-in-Nouveau/20210219-100858
> git checkout bb5444811772d30b2e3bbaa44baeb8a4b3f03cec
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp at intel.com>
>
> All error/warnings (new ones prefixed by >>):
>
> >> fs/proc/task_mmu.c:521:12: error: implicit declaration of function
'is_device_exclusive_entry' [-Werror,-Wimplicit-function-declaration]
> else if (is_device_exclusive_entry(swpent))
> ^
> fs/proc/task_mmu.c:521:12: note: did you mean 'is_device_private_entry'?
> include/linux/swapops.h:176:20: note: 'is_device_private_entry' declared
here
> static inline bool is_device_private_entry(swp_entry_t entry)
> ^
> >> fs/proc/task_mmu.c:522:11: error: implicit declaration of function
'device_exclusive_entry_to_page' [-Werror,-Wimplicit-function-declaration]
> page = device_exclusive_entry_to_page(swpent);
> ^
> fs/proc/task_mmu.c:522:11: note: did you mean
'device_private_entry_to_page'?
> include/linux/swapops.h:191:28: note: 'device_private_entry_to_page'
declared here
> static inline struct page *device_private_entry_to_page(swp_entry_t
entry)
> ^
> >> fs/proc/task_mmu.c:522:9: warning: incompatible integer to pointer
conversion assigning to 'struct page *' from 'int' [-Wint-conversion]
> page = device_exclusive_entry_to_page(swpent);
> ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> fs/proc/task_mmu.c:1395:7: error: implicit declaration of function
'is_device_exclusive_entry' [-Werror,-Wimplicit-function-declaration]
> if (is_device_exclusive_entry(entry))
> ^
> fs/proc/task_mmu.c:1396:11: error: implicit declaration of function
'device_exclusive_entry_to_page' [-Werror,-Wimplicit-function-declaration]
> page = device_exclusive_entry_to_page(entry);
> ^
> fs/proc/task_mmu.c:1396:9: warning: incompatible integer to pointer
conversion assigning to 'struct page *' from 'int' [-Wint-conversion]
> page = device_exclusive_entry_to_page(entry);
> ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 2 warnings and 4 errors generated.
>
>
> vim +/is_device_exclusive_entry +521 fs/proc/task_mmu.c
>
> 490
> 491 static void smaps_pte_entry(pte_t *pte, unsigned long addr,
> 492 struct mm_walk *walk)
> 493 {
> 494 struct mem_size_stats *mss = walk->private;
> 495 struct vm_area_struct *vma = walk->vma;
> 496 bool locked = !!(vma->vm_flags & VM_LOCKED);
> 497 struct page *page = NULL;
> 498
> 499 if (pte_present(*pte)) {
> 500 page = vm_normal_page(vma, addr, *pte);
> 501 } else if (is_swap_pte(*pte)) {
> 502 swp_entry_t swpent = pte_to_swp_entry(*pte);
> 503
> 504 if (!non_swap_entry(swpent)) {
> 505 int mapcount;
> 506
> 507 mss->swap += PAGE_SIZE;
> 508 mapcount = swp_swapcount(swpent);
> 509 if (mapcount >= 2) {
> 510 u64 pss_delta = (u64)PAGE_SIZE <<
PSS_SHIFT;
> 511
> 512 do_div(pss_delta, mapcount);
> 513 mss->swap_pss += pss_delta;
> 514 } else {
> 515 mss->swap_pss += (u64)PAGE_SIZE <<
PSS_SHIFT;
> 516 }
> 517 } else if (is_migration_entry(swpent))
> 518 page = migration_entry_to_page(swpent);
> 519 else if (is_device_private_entry(swpent))
> 520 page = device_private_entry_to_page(swpent);
> > 521 else if (is_device_exclusive_entry(swpent))
> > 522 page =
device_exclusive_entry_to_page(swpent);
> 523 } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss-
>check_shmem_swap
> 524 &&
pte_none(*pte))) {
> 525 page = xa_load(&vma->vm_file->f_mapping->i_pages,
> 526
linear_page_index(vma, addr));
> 527 if (xa_is_value(page))
> 528 mss->swap += PAGE_SIZE;
> 529 return;
> 530 }
> 531
> 532 if (!page)
> 533 return;
> 534
> 535 smaps_account(mss, page, false, pte_young(*pte),
pte_dirty(*pte), locked);
> 536 }
> 537
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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