From: kbuild test robot <fengguang.wu@intel.com>
To: "Jérôme Glisse" <jglisse@redhat.com>
Cc: kbuild-all@01.org, Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: [linux-next:master 9014/9031] mm/madvise.c:341: warning: value computed is not used
Date: Tue, 11 Apr 2017 16:07:59 +0800 [thread overview]
Message-ID: <201704111640.DWJ97QUG%fengguang.wu@intel.com> (raw)
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: f8c97bdb49832d2b0edaa0c05db873aa2f6101ff
commit: 0b0a6994b02cac83ae132baea829ff073ca6cbef [9014/9031] mm/unaddressable-memory: new type of ZONE_DEVICE for unaddressable memory
config: x86_64-randconfig-b0-04110636 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
git checkout 0b0a6994b02cac83ae132baea829ff073ca6cbef
# save the attached .config to linux build tree
make ARCH=x86_64
All warnings (new ones prefixed by >>):
mm/madvise.c: In function 'madvise_free_pte_range':
>> mm/madvise.c:341: warning: value computed is not used
vim +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@kernel.org>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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