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Message-ID: <202509272136.N4ELb64u-lkp@intel.com>
Date: Sat, 27 Sep 2025 21:29:35 +0200
From: kernel test robot <lkp@...el.com>
To: Brendan Jackman <jackmanb@...gle.com>,
Andy Lutomirski <luto@...nel.org>,
Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
"Liam R. Howlett" <Liam.Howlett@...cle.com>,
Suren Baghdasaryan <surenb@...gle.com>,
Michal Hocko <mhocko@...e.com>,
Johannes Weiner <hannes@...xchg.org>, Zi Yan <ziy@...dia.com>,
Axel Rasmussen <axelrasmussen@...gle.com>,
Yuanchu Xie <yuanchu@...gle.com>,
Roman Gushchin <roman.gushchin@...ux.dev>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev, bp@...en8.de,
dave.hansen@...ux.intel.com, mingo@...hat.com, tglx@...utronix.de,
akpm@...ux-foundation.org, david@...hat.com, derkling@...gle.com,
junaids@...gle.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, reijiw@...gle.com, rientjes@...gle.com,
rppt@...nel.org, vbabka@...e.cz, x86@...nel.org,
yosry.ahmed@...ux.dev
Subject: Re: [PATCH 03/21] x86/mm: factor out phys_pgd_init()
Hi Brendan,
kernel test robot noticed the following build warnings:
[auto build test WARNING on bf2602a3cb2381fb1a04bf1c39a290518d2538d1]
url: https://github.com/intel-lab-lkp/linux/commits/Brendan-Jackman/x86-mm-asi-Add-CONFIG_MITIGATION_ADDRESS_SPACE_ISOLATION/20250924-230633
base: bf2602a3cb2381fb1a04bf1c39a290518d2538d1
patch link: https://lore.kernel.org/r/20250924-b4-asi-page-alloc-v1-3-2d861768041f%40google.com
patch subject: [PATCH 03/21] x86/mm: factor out phys_pgd_init()
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20250927/202509272136.N4ELb64u-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250927/202509272136.N4ELb64u-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/202509272136.N4ELb64u-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> arch/x86/mm/init_64.c:747:23: warning: variable 'vaddr_start' set but not used [-Wunused-but-set-variable]
747 | unsigned long vaddr, vaddr_start, vaddr_end, vaddr_next, paddr_last;
| ^
1 warning generated.
vim +/vaddr_start +747 arch/x86/mm/init_64.c
7e82ea946ae4d0 arch/x86/mm/init_64.c Kirill A. Shutemov 2017-06-06 742
eccd906484d1cd arch/x86/mm/init_64.c Brijesh Singh 2019-04-17 743 static unsigned long __meminit
46b7f8ebabd0a2 arch/x86/mm/init_64.c Brendan Jackman 2025-09-24 744 phys_pgd_init(pgd_t *pgd_page, unsigned long paddr_start, unsigned long paddr_end,
46b7f8ebabd0a2 arch/x86/mm/init_64.c Brendan Jackman 2025-09-24 745 unsigned long page_size_mask, pgprot_t prot, bool init, bool *pgd_changed)
^1da177e4c3f41 arch/x86_64/mm/init.c Linus Torvalds 2005-04-16 746 {
59b3d0206d74a7 arch/x86/mm/init_64.c Thomas Garnier 2016-06-21 @747 unsigned long vaddr, vaddr_start, vaddr_end, vaddr_next, paddr_last;
^1da177e4c3f41 arch/x86_64/mm/init.c Linus Torvalds 2005-04-16 748
46b7f8ebabd0a2 arch/x86/mm/init_64.c Brendan Jackman 2025-09-24 749 *pgd_changed = false;
46b7f8ebabd0a2 arch/x86/mm/init_64.c Brendan Jackman 2025-09-24 750
59b3d0206d74a7 arch/x86/mm/init_64.c Thomas Garnier 2016-06-21 751 paddr_last = paddr_end;
59b3d0206d74a7 arch/x86/mm/init_64.c Thomas Garnier 2016-06-21 752 vaddr = (unsigned long)__va(paddr_start);
59b3d0206d74a7 arch/x86/mm/init_64.c Thomas Garnier 2016-06-21 753 vaddr_end = (unsigned long)__va(paddr_end);
59b3d0206d74a7 arch/x86/mm/init_64.c Thomas Garnier 2016-06-21 754 vaddr_start = vaddr;
^1da177e4c3f41 arch/x86_64/mm/init.c Linus Torvalds 2005-04-16 755
59b3d0206d74a7 arch/x86/mm/init_64.c Thomas Garnier 2016-06-21 756 for (; vaddr < vaddr_end; vaddr = vaddr_next) {
46b7f8ebabd0a2 arch/x86/mm/init_64.c Brendan Jackman 2025-09-24 757 pgd_t *pgd = pgd_offset_pgd(pgd_page, vaddr);
f2a6a7050109e0 arch/x86/mm/init_64.c Kirill A. Shutemov 2017-03-17 758 p4d_t *p4d;
44df75e629106e arch/x86_64/mm/init.c Matt Tolentino 2006-01-17 759
59b3d0206d74a7 arch/x86/mm/init_64.c Thomas Garnier 2016-06-21 760 vaddr_next = (vaddr & PGDIR_MASK) + PGDIR_SIZE;
4f9c11dd49fb73 arch/x86/mm/init_64.c Jeremy Fitzhardinge 2008-06-25 761
7e82ea946ae4d0 arch/x86/mm/init_64.c Kirill A. Shutemov 2017-06-06 762 if (pgd_val(*pgd)) {
7e82ea946ae4d0 arch/x86/mm/init_64.c Kirill A. Shutemov 2017-06-06 763 p4d = (p4d_t *)pgd_page_vaddr(*pgd);
7e82ea946ae4d0 arch/x86/mm/init_64.c Kirill A. Shutemov 2017-06-06 764 paddr_last = phys_p4d_init(p4d, __pa(vaddr),
59b3d0206d74a7 arch/x86/mm/init_64.c Thomas Garnier 2016-06-21 765 __pa(vaddr_end),
eccd906484d1cd arch/x86/mm/init_64.c Brijesh Singh 2019-04-17 766 page_size_mask,
c164fbb40c43f8 arch/x86/mm/init_64.c Logan Gunthorpe 2020-04-10 767 prot, init);
4f9c11dd49fb73 arch/x86/mm/init_64.c Jeremy Fitzhardinge 2008-06-25 768 continue;
4f9c11dd49fb73 arch/x86/mm/init_64.c Jeremy Fitzhardinge 2008-06-25 769 }
4f9c11dd49fb73 arch/x86/mm/init_64.c Jeremy Fitzhardinge 2008-06-25 770
7e82ea946ae4d0 arch/x86/mm/init_64.c Kirill A. Shutemov 2017-06-06 771 p4d = alloc_low_page();
7e82ea946ae4d0 arch/x86/mm/init_64.c Kirill A. Shutemov 2017-06-06 772 paddr_last = phys_p4d_init(p4d, __pa(vaddr), __pa(vaddr_end),
c164fbb40c43f8 arch/x86/mm/init_64.c Logan Gunthorpe 2020-04-10 773 page_size_mask, prot, init);
8ae3a5a8dff2c9 arch/x86/mm/init_64.c Jan Beulich 2008-08-21 774
8ae3a5a8dff2c9 arch/x86/mm/init_64.c Jan Beulich 2008-08-21 775 spin_lock(&init_mm.page_table_lock);
ed7588d5dc6f5e arch/x86/mm/init_64.c Kirill A. Shutemov 2018-05-18 776 if (pgtable_l5_enabled())
eccd906484d1cd arch/x86/mm/init_64.c Brijesh Singh 2019-04-17 777 pgd_populate_init(&init_mm, pgd, p4d, init);
7e82ea946ae4d0 arch/x86/mm/init_64.c Kirill A. Shutemov 2017-06-06 778 else
eccd906484d1cd arch/x86/mm/init_64.c Brijesh Singh 2019-04-17 779 p4d_populate_init(&init_mm, p4d_offset(pgd, vaddr),
eccd906484d1cd arch/x86/mm/init_64.c Brijesh Singh 2019-04-17 780 (pud_t *) p4d, init);
eccd906484d1cd arch/x86/mm/init_64.c Brijesh Singh 2019-04-17 781
8ae3a5a8dff2c9 arch/x86/mm/init_64.c Jan Beulich 2008-08-21 782 spin_unlock(&init_mm.page_table_lock);
46b7f8ebabd0a2 arch/x86/mm/init_64.c Brendan Jackman 2025-09-24 783 *pgd_changed = true;
46b7f8ebabd0a2 arch/x86/mm/init_64.c Brendan Jackman 2025-09-24 784 }
46b7f8ebabd0a2 arch/x86/mm/init_64.c Brendan Jackman 2025-09-24 785
46b7f8ebabd0a2 arch/x86/mm/init_64.c Brendan Jackman 2025-09-24 786 return paddr_last;
^1da177e4c3f41 arch/x86_64/mm/init.c Linus Torvalds 2005-04-16 787 }
9b861528a8012e arch/x86/mm/init_64.c Haicheng Li 2010-08-20 788
--
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