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Message-ID: <202409122349.PQp7sq2x-lkp@intel.com>
Date: Thu, 12 Sep 2024 23:44:42 +0800
From: kernel test robot <lkp@...el.com>
To: Dev Jain <dev.jain@....com>, akpm@...ux-foundation.org,
david@...hat.com, willy@...radead.org,
kirill.shutemov@...ux.intel.com
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
ryan.roberts@....com, anshuman.khandual@....com,
catalin.marinas@....com, cl@...two.org, vbabka@...e.cz,
mhocko@...e.com, apopple@...dia.com, dave.hansen@...ux.intel.com,
will@...nel.org, baohua@...nel.org, jack@...e.cz,
mark.rutland@....com, hughd@...gle.com, aneesh.kumar@...nel.org,
yang@...amperecomputing.com, peterx@...hat.com, ioworker0@...il.com,
jglisse@...gle.com, wangkefeng.wang@...wei.com, ziy@...dia.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, Dev Jain <dev.jain@....com>
Subject: Re: [PATCH v3 2/2] mm: Allocate THP on hugezeropage wp-fault
Hi Dev,
kernel test robot noticed the following build warnings:
[auto build test WARNING on v6.11-rc7]
[also build test WARNING on linus/master]
[cannot apply to akpm-mm/mm-everything next-20240912]
[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/Dev-Jain/mm-Abstract-THP-allocation/20240911-145809
base: v6.11-rc7
patch link: https://lore.kernel.org/r/20240911065600.1002644-3-dev.jain%40arm.com
patch subject: [PATCH v3 2/2] mm: Allocate THP on hugezeropage wp-fault
config: x86_64-rhel-8.3-rust (https://download.01.org/0day-ci/archive/20240912/202409122349.PQp7sq2x-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240912/202409122349.PQp7sq2x-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409122349.PQp7sq2x-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> mm/huge_memory.c:990:15: warning: variable 'old_pmd' set but not used [-Wunused-but-set-variable]
990 | pmd_t entry, old_pmd;
| ^
mm/huge_memory.c:1016:6: warning: variable 'pgtable' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
1016 | if (unlikely(!folio)) {
| ^~~~~~~~~~~~~~~~
include/linux/compiler.h:77:22: note: expanded from macro 'unlikely'
77 | # define unlikely(x) __builtin_expect(!!(x), 0)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
mm/huge_memory.c:1055:6: note: uninitialized use occurs here
1055 | if (pgtable)
| ^~~~~~~
mm/huge_memory.c:1016:2: note: remove the 'if' if its condition is always false
1016 | if (unlikely(!folio)) {
| ^~~~~~~~~~~~~~~~~~~~~~~
1017 | ret = VM_FAULT_FALLBACK;
| ~~~~~~~~~~~~~~~~~~~~~~~~
1018 | goto release;
| ~~~~~~~~~~~~~
1019 | }
| ~
mm/huge_memory.c:1010:19: note: initialize the variable 'pgtable' to silence this warning
1010 | pgtable_t pgtable;
| ^
| = NULL
2 warnings generated.
vim +/old_pmd +990 mm/huge_memory.c
986
987 static void map_pmd_thp(struct folio *folio, struct vm_fault *vmf,
988 struct vm_area_struct *vma, unsigned long haddr)
989 {
> 990 pmd_t entry, old_pmd;
991 bool is_pmd_none = pmd_none(*vmf->pmd);
992
993 entry = mk_huge_pmd(&folio->page, vma->vm_page_prot);
994 entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
995 folio_add_new_anon_rmap(folio, vma, haddr, RMAP_EXCLUSIVE);
996 folio_add_lru_vma(folio, vma);
997 if (!is_pmd_none)
998 old_pmd = pmdp_huge_clear_flush(vma, haddr, vmf->pmd);
999 set_pmd_at(vma->vm_mm, haddr, vmf->pmd, entry);
1000 update_mmu_cache_pmd(vma, vmf->address, vmf->pmd);
1001 add_mm_counter(vma->vm_mm, MM_ANONPAGES, HPAGE_PMD_NR);
1002 if (is_pmd_none)
1003 mm_inc_nr_ptes(vma->vm_mm);
1004 }
1005
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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