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X-CSE-ConnectionGUID: QR9EhjxwR5Gk1JfHK7C0og== X-CSE-MsgGUID: YTSoR93FRi2s2Wu1MnyKww== X-IronPort-AV: E=McAfee;i="6800,10657,11755"; a="64468873" X-IronPort-AV: E=Sophos;i="6.23,174,1770624000"; d="scan'208";a="64468873" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Apr 2026 21:22:26 -0700 X-CSE-ConnectionGUID: IdRtxWY+QMC1AYOUV6WlVw== X-CSE-MsgGUID: C5Qd/IgORoS6Wnktvo/TAQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,174,1770624000"; d="scan'208";a="226748676" Received: from lkp-server01.sh.intel.com (HELO 3eaaf1a74b89) ([10.239.97.150]) by fmviesa008.fm.intel.com with ESMTP; 11 Apr 2026 21:22:25 -0700 Received: from kbuild by 3eaaf1a74b89 with local (Exim 4.98.2) (envelope-from ) id 1wBmL0-000000001rV-3Y8G; Sun, 12 Apr 2026 04:22:22 +0000 Date: Sun, 12 Apr 2026 12:22:08 +0800 From: kernel test robot To: oe-kbuild@lists.linux.dev Cc: lkp@intel.com, Dan Carpenter Subject: arch/powerpc/mm/book3s64/hugetlbpage.c:77 __hash_page_huge() warn: bitwise AND condition is false here Message-ID: <202604121243.PfxMMiar-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev CC: linux-kernel@vger.kernel.org TO: Alistair Popple CC: Andrew Morton CC: Linux Memory Management List CC: Jason Gunthorpe tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f5459048c38a00fc583658d6dcd0f894aff6df8f commit: bea0cc7cf4a51e8d3a0042212df3b83b49df58a7 powerpc: remove checks for devmap pages and PMDs/PUDs date: 9 months ago :::::: branch date: 4 hours ago :::::: commit date: 9 months ago config: powerpc64-randconfig-r072-20260412 (https://download.01.org/0day-ci/archive/20260412/202604121243.PfxMMiar-lkp@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) smatch: v0.5.0-9004-gb810ac53 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 | Fixes: bea0cc7cf4a5 ("powerpc: remove checks for devmap pages and PMDs/PUDs") | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202604121243.PfxMMiar-lkp@intel.com/ smatch warnings: arch/powerpc/mm/book3s64/hugetlbpage.c:77 __hash_page_huge() warn: bitwise AND condition is false here vim +77 arch/powerpc/mm/book3s64/hugetlbpage.c c5710cd2073503 arch/powerpc/mm/book3s64/hash_hugetlbpage.c Christophe Leroy 2019-04-26 18 387e220a2e5e63 arch/powerpc/mm/book3s64/hugetlbpage.c Nicholas Piggin 2021-12-02 19 #ifdef CONFIG_PPC_64S_HASH_MMU 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 20 int __hash_page_huge(unsigned long ea, unsigned long access, unsigned long vsid, aefa5688c07072 arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2014-12-04 21 pte_t *ptep, unsigned long trap, unsigned long flags, aefa5688c07072 arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2014-12-04 22 int ssize, unsigned int shift, unsigned int mmu_psize) 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 23 { bf9a95f9a6481b arch/powerpc/mm/hugetlbpage-hash64.c Ram Pai 2017-11-06 24 real_pte_t rpte; 5524a27d39b687 arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2012-09-10 25 unsigned long vpn; 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 26 unsigned long old_pte, new_pte; 8132cf115efc3b arch/powerpc/mm/hugetlbpage-hash64.c Qian Cai 2019-02-27 27 unsigned long rflags, pa; ff31e105464d8c arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2018-02-11 28 long slot, offset; 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 29 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 30 BUG_ON(shift != mmu_psize_defs[mmu_psize].shift); 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 31 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 32 /* Search the Linux page table for a match with va */ 5524a27d39b687 arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2012-09-10 33 vpn = hpt_vpn(ea, vsid, ssize); 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 34 47d99948eee48a arch/powerpc/mm/book3s64/hash_hugetlbpage.c Christophe Leroy 2019-03-29 35 /* 47d99948eee48a arch/powerpc/mm/book3s64/hash_hugetlbpage.c Christophe Leroy 2019-03-29 36 * At this point, we have a pte (old_pte) which can be used to build 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 37 * or update an HPTE. There are 2 cases: 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 38 * 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 39 * 1. There is a valid (present) pte with no associated HPTE (this is 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 40 * the most common case) 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 41 * 2. There is a valid (present) pte with an associated HPTE. The 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 42 * current values of the pp bits in the HPTE prevent access 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 43 * because we are doing software DIRTY bit management and the 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 44 * page is currently not DIRTY. 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 45 */ 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 46 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 47 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 48 do { 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 49 old_pte = pte_val(*ptep); 171aa2caaad16e arch/powerpc/mm/hugetlbpage-hash64.c Benjamin Herrenschmidt 2010-07-23 50 /* If PTE busy, retry the access */ 945537df7a107e arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2016-04-29 51 if (unlikely(old_pte & H_PAGE_BUSY)) 171aa2caaad16e arch/powerpc/mm/hugetlbpage-hash64.c Benjamin Herrenschmidt 2010-07-23 52 return 0; 171aa2caaad16e arch/powerpc/mm/hugetlbpage-hash64.c Benjamin Herrenschmidt 2010-07-23 53 /* If PTE permissions don't match, take page fault */ ac29c64089b74d arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2016-04-29 54 if (unlikely(!check_pte_access(access, old_pte))) 171aa2caaad16e arch/powerpc/mm/hugetlbpage-hash64.c Benjamin Herrenschmidt 2010-07-23 55 return 1; 57fb15c32f4f6a arch/powerpc/mm/book3s64/hugetlbpage.c Christophe Leroy 2024-07-02 56 /* 57fb15c32f4f6a arch/powerpc/mm/book3s64/hugetlbpage.c Christophe Leroy 2024-07-02 57 * If hash-4k, hugepages use seeral contiguous PxD entries 57fb15c32f4f6a arch/powerpc/mm/book3s64/hugetlbpage.c Christophe Leroy 2024-07-02 58 * so bail out and let mm make the page young or dirty 57fb15c32f4f6a arch/powerpc/mm/book3s64/hugetlbpage.c Christophe Leroy 2024-07-02 59 */ 57fb15c32f4f6a arch/powerpc/mm/book3s64/hugetlbpage.c Christophe Leroy 2024-07-02 60 if (IS_ENABLED(CONFIG_PPC_4K_PAGES)) { 57fb15c32f4f6a arch/powerpc/mm/book3s64/hugetlbpage.c Christophe Leroy 2024-07-02 61 if (!(old_pte & _PAGE_ACCESSED)) 57fb15c32f4f6a arch/powerpc/mm/book3s64/hugetlbpage.c Christophe Leroy 2024-07-02 62 return 1; 57fb15c32f4f6a arch/powerpc/mm/book3s64/hugetlbpage.c Christophe Leroy 2024-07-02 63 if ((access & _PAGE_WRITE) && !(old_pte & _PAGE_DIRTY)) 57fb15c32f4f6a arch/powerpc/mm/book3s64/hugetlbpage.c Christophe Leroy 2024-07-02 64 return 1; 57fb15c32f4f6a arch/powerpc/mm/book3s64/hugetlbpage.c Christophe Leroy 2024-07-02 65 } ac29c64089b74d arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2016-04-29 66 47d99948eee48a arch/powerpc/mm/book3s64/hash_hugetlbpage.c Christophe Leroy 2019-03-29 67 /* 47d99948eee48a arch/powerpc/mm/book3s64/hash_hugetlbpage.c Christophe Leroy 2019-03-29 68 * Try to lock the PTE, add ACCESSED and DIRTY if it was 47d99948eee48a arch/powerpc/mm/book3s64/hash_hugetlbpage.c Christophe Leroy 2019-03-29 69 * a write access 47d99948eee48a arch/powerpc/mm/book3s64/hash_hugetlbpage.c Christophe Leroy 2019-03-29 70 */ 945537df7a107e arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2016-04-29 71 new_pte = old_pte | H_PAGE_BUSY | _PAGE_ACCESSED; c7d54842deb1fa arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2016-04-29 72 if (access & _PAGE_WRITE) 171aa2caaad16e arch/powerpc/mm/hugetlbpage-hash64.c Benjamin Herrenschmidt 2010-07-23 73 new_pte |= _PAGE_DIRTY; 3910a7f485e122 arch/powerpc/mm/hugetlbpage-hash64.c Michael Ellerman 2016-04-29 74 } while(!pte_xchg(ptep, __pte(old_pte), __pte(new_pte))); 3910a7f485e122 arch/powerpc/mm/hugetlbpage-hash64.c Michael Ellerman 2016-04-29 75 75646c480fdeff arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2018-09-20 76 /* Make sure this is a hugetlb entry */ bea0cc7cf4a51e arch/powerpc/mm/book3s64/hugetlbpage.c Alistair Popple 2025-06-19 @77 if (old_pte & H_PAGE_THP_HUGE) 75646c480fdeff arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2018-09-20 78 return 0; 75646c480fdeff arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2018-09-20 79 d94b827e89dc3f arch/powerpc/mm/book3s64/hash_hugetlbpage.c Aneesh Kumar K.V 2020-11-27 80 rflags = htab_convert_pte_flags(new_pte, flags); ff31e105464d8c arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2018-02-11 81 if (unlikely(mmu_psize == MMU_PAGE_16G)) ff31e105464d8c arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2018-02-11 82 offset = PTRS_PER_PUD; ff31e105464d8c arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2018-02-11 83 else ff31e105464d8c arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2018-02-11 84 offset = PTRS_PER_PMD; ff31e105464d8c arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2018-02-11 85 rpte = __real_pte(__pte(old_pte), ptep, offset); 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 86 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 87 if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) 47d99948eee48a arch/powerpc/mm/book3s64/hash_hugetlbpage.c Christophe Leroy 2019-03-29 88 /* 47d99948eee48a arch/powerpc/mm/book3s64/hash_hugetlbpage.c Christophe Leroy 2019-03-29 89 * No CPU has hugepages but lacks no execute, so we 47d99948eee48a arch/powerpc/mm/book3s64/hash_hugetlbpage.c Christophe Leroy 2019-03-29 90 * don't need to worry about that case 47d99948eee48a arch/powerpc/mm/book3s64/hash_hugetlbpage.c Christophe Leroy 2019-03-29 91 */ 0895ecda79428d arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 92 rflags = hash_page_do_lazy_icache(rflags, __pte(old_pte), trap); 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 93 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 94 /* Check if pte already has an hpte (case 2) */ 945537df7a107e arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2016-04-29 95 if (unlikely(old_pte & H_PAGE_HASHPTE)) { 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 96 /* There MIGHT be an HPTE for this pte */ bf9a95f9a6481b arch/powerpc/mm/hugetlbpage-hash64.c Ram Pai 2017-11-06 97 unsigned long gslot; 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 98 bf9a95f9a6481b arch/powerpc/mm/hugetlbpage-hash64.c Ram Pai 2017-11-06 99 gslot = pte_get_hash_gslot(vpn, shift, ssize, rpte, 0); bf9a95f9a6481b arch/powerpc/mm/hugetlbpage-hash64.c Ram Pai 2017-11-06 100 if (mmu_hash_ops.hpte_updatepp(gslot, rflags, vpn, mmu_psize, aefa5688c07072 arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2014-12-04 101 mmu_psize, ssize, flags) == -1) 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 102 old_pte &= ~_PAGE_HPTEFLAGS; 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 103 } 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 104 945537df7a107e arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2016-04-29 105 if (likely(!(old_pte & H_PAGE_HASHPTE))) { 5524a27d39b687 arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2012-09-10 106 unsigned long hash = hpt_hash(vpn, shift, ssize); 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 107 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 108 pa = pte_pfn(__pte(old_pte)) << PAGE_SHIFT; 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 109 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 110 /* clear HPTE slot informations in new PTE */ 945537df7a107e arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2016-04-29 111 new_pte = (new_pte & ~_PAGE_HPTEFLAGS) | H_PAGE_HASHPTE; bf680d51605662 arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2015-12-01 112 b170bd3de6a7f6 arch/powerpc/mm/hugetlbpage-hash64.c Li Zhong 2013-04-15 113 slot = hpte_insert_repeating(hash, vpn, pa, rflags, 0, 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 114 mmu_psize, ssize); 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 115 b1623e7eb280f8 arch/powerpc/mm/hugetlbpage-hash64.c Anton Blanchard 2010-07-14 116 /* b1623e7eb280f8 arch/powerpc/mm/hugetlbpage-hash64.c Anton Blanchard 2010-07-14 117 * Hypervisor failure. Restore old pte and return -1 b1623e7eb280f8 arch/powerpc/mm/hugetlbpage-hash64.c Anton Blanchard 2010-07-14 118 * similar to __hash_page_* b1623e7eb280f8 arch/powerpc/mm/hugetlbpage-hash64.c Anton Blanchard 2010-07-14 119 */ b1623e7eb280f8 arch/powerpc/mm/hugetlbpage-hash64.c Anton Blanchard 2010-07-14 120 if (unlikely(slot == -2)) { b1623e7eb280f8 arch/powerpc/mm/hugetlbpage-hash64.c Anton Blanchard 2010-07-14 121 *ptep = __pte(old_pte); 4b8692c022a4b1 arch/powerpc/mm/hugetlbpage-hash64.c Benjamin Herrenschmidt 2010-07-23 122 hash_failure_debug(ea, access, vsid, trap, ssize, d8139ebf8596a1 arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2013-04-28 123 mmu_psize, mmu_psize, old_pte); 171aa2caaad16e arch/powerpc/mm/hugetlbpage-hash64.c Benjamin Herrenschmidt 2010-07-23 124 return -1; b1623e7eb280f8 arch/powerpc/mm/hugetlbpage-hash64.c Anton Blanchard 2010-07-14 125 } 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 126 ff31e105464d8c arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2018-02-11 127 new_pte |= pte_set_hidx(ptep, rpte, 0, slot, offset); 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 128 } 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 129 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 130 /* 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 131 * No need to use ldarx/stdcx here 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 132 */ 945537df7a107e arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2016-04-29 133 *ptep = __pte(new_pte & ~H_PAGE_BUSY); 171aa2caaad16e arch/powerpc/mm/hugetlbpage-hash64.c Benjamin Herrenschmidt 2010-07-23 134 return 0; 883a3e523672eb arch/powerpc/mm/hugetlbpage-hash64.c David Gibson 2009-10-26 135 } 387e220a2e5e63 arch/powerpc/mm/book3s64/hugetlbpage.c Nicholas Piggin 2021-12-02 136 #endif 8ef5cbde6dafce arch/powerpc/mm/hugetlbpage-hash64.c Aneesh Kumar K.V 2019-03-05 137 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki