tree: git://git.cmpxchg.org/linux-mmotm.git master
head: 8276ddb3c638602509386f1a05f75326dbf5ce09
commit: 4ec7a28189776a031d4e7f8ee8581c0db9f96847 [110/211] mm/ZONE_DEVICE/unaddressable: add support for un-addressable device memory
config: i386-randconfig-s0-201711 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
git checkout 4ec7a28189776a031d4e7f8ee8581c0db9f96847
# save the attached .config to linux build tree
make ARCH=i386
All warnings (new ones prefixed by >>):
In file included from mm/madvise.c:22:0:
mm/madvise.c: In function 'madvise_free_pte_range':
include/linux/swap.h:450:55: warning: value computed is not used [-Wunused-value]
#define free_swap_and_cache(e) (is_migration_entry(e) || is_device_entry(e))
^
>> mm/madvise.c:341:4: note: in expansion of macro 'free_swap_and_cache'
free_swap_and_cache(entry);
^~~~~~~~~~~~~~~~~~~
vim +/free_swap_and_cache +341 mm/madvise.c
854e9ed0 Minchan Kim 2016-01-15 325 ptent = *pte;
854e9ed0 Minchan Kim 2016-01-15 326
64b42bc1 Minchan Kim 2016-01-15 327 if (pte_none(ptent))
854e9ed0 Minchan Kim 2016-01-15 328 continue;
64b42bc1 Minchan Kim 2016-01-15 329 /*
64b42bc1 Minchan Kim 2016-01-15 330 * If the pte has swp_entry, just clear page table to
64b42bc1 Minchan Kim 2016-01-15 331 * prevent swap-in which is more expensive rather than
64b42bc1 Minchan Kim 2016-01-15 332 * (page allocation + zeroing).
64b42bc1 Minchan Kim 2016-01-15 333 */
64b42bc1 Minchan Kim 2016-01-15 334 if (!pte_present(ptent)) {
64b42bc1 Minchan Kim 2016-01-15 335 swp_entry_t entry;
64b42bc1 Minchan Kim 2016-01-15 336
64b42bc1 Minchan Kim 2016-01-15 337 entry = pte_to_swp_entry(ptent);
64b42bc1 Minchan Kim 2016-01-15 338 if (non_swap_entry(entry))
64b42bc1 Minchan Kim 2016-01-15 339 continue;
64b42bc1 Minchan Kim 2016-01-15 340 nr_swap--;
64b42bc1 Minchan Kim 2016-01-15 @341 free_swap_and_cache(entry);
64b42bc1 Minchan Kim 2016-01-15 342 pte_clear_not_present_full(mm, addr, pte, tlb->fullmm);
64b42bc1 Minchan Kim 2016-01-15 343 continue;
64b42bc1 Minchan Kim 2016-01-15 344 }
854e9ed0 Minchan Kim 2016-01-15 345
854e9ed0 Minchan Kim 2016-01-15 346 page = vm_normal_page(vma, addr, ptent);
854e9ed0 Minchan Kim 2016-01-15 347 if (!page)
854e9ed0 Minchan Kim 2016-01-15 348 continue;
854e9ed0 Minchan Kim 2016-01-15 349
:::::: The code at line 341 was first introduced by commit
:::::: 64b42bc1cfdf6e2c3ab7315f2ff56c31cd257370 mm/madvise.c: free swp_entry in madvise_free
:::::: TO: Minchan Kim <minchan@xxxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
Attachment:
.config.gz
Description: application/gzip
