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Peter Anvin" , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Juergen Gross , Kevin Brodsky , Muchun Song , Oscar Salvador , Joao Martins , Lorenzo Stoakes , Jane Chu , Alistair Popple , Mike Rapoport , David Hildenbrand , Gwan-gyeong Mun , "Aneesh Kumar K . V" Subject: Re: [PATCH v2 mm-hotfixes 1/5] mm: move page table sync declarations to asm/pgalloc.h Message-ID: <202507211129.Xbn2bAOg-lkp@intel.com> References: <20250720234203.9126-2-harry.yoo@oracle.com> Precedence: bulk X-Mailing-List: oe-kbuild-all@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250720234203.9126-2-harry.yoo@oracle.com> Hi Harry, kernel test robot noticed the following build warnings: [auto build test WARNING on akpm-mm/mm-everything] url: https://github.com/intel-lab-lkp/linux/commits/Harry-Yoo/mm-move-page-table-sync-declarations-to-asm-pgalloc-h/20250721-074448 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20250720234203.9126-2-harry.yoo%40oracle.com patch subject: [PATCH v2 mm-hotfixes 1/5] mm: move page table sync declarations to asm/pgalloc.h config: i386-buildonly-randconfig-003-20250721 (https://download.01.org/0day-ci/archive/20250721/202507211129.Xbn2bAOg-lkp@intel.com/config) compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250721/202507211129.Xbn2bAOg-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 | Closes: https://lore.kernel.org/oe-kbuild-all/202507211129.Xbn2bAOg-lkp@intel.com/ All warnings (new ones prefixed by >>): >> arch/x86/mm/fault.c:265:6: warning: no previous prototype for 'arch_sync_kernel_mappings' [-Wmissing-prototypes] 265 | void arch_sync_kernel_mappings(unsigned long start, unsigned long end) | ^~~~~~~~~~~~~~~~~~~~~~~~~ vim +/arch_sync_kernel_mappings +265 arch/x86/mm/fault.c 4819e15f740ec88 Joerg Roedel 2020-09-02 264 1e15d374bb1cb95 Alexander Potapenko 2023-01-11 @265 void arch_sync_kernel_mappings(unsigned long start, unsigned long end) f2f13a8535174db Ingo Molnar 2009-02-20 266 { 86cf69f1d893d48 Joerg Roedel 2020-06-01 267 unsigned long addr; f2f13a8535174db Ingo Molnar 2009-02-20 268 86cf69f1d893d48 Joerg Roedel 2020-06-01 269 for (addr = start & PMD_MASK; 86cf69f1d893d48 Joerg Roedel 2020-06-01 270 addr >= TASK_SIZE_MAX && addr < VMALLOC_END; 86cf69f1d893d48 Joerg Roedel 2020-06-01 271 addr += PMD_SIZE) { f2f13a8535174db Ingo Molnar 2009-02-20 272 struct page *page; f2f13a8535174db Ingo Molnar 2009-02-20 273 a79e53d85683c6d Andrea Arcangeli 2011-02-16 274 spin_lock(&pgd_lock); f2f13a8535174db Ingo Molnar 2009-02-20 275 list_for_each_entry(page, &pgd_list, lru) { 617d34d9e5d8326 Jeremy Fitzhardinge 2010-09-21 276 spinlock_t *pgt_lock; 617d34d9e5d8326 Jeremy Fitzhardinge 2010-09-21 277 a79e53d85683c6d Andrea Arcangeli 2011-02-16 278 /* the pgt_lock only for Xen */ 617d34d9e5d8326 Jeremy Fitzhardinge 2010-09-21 279 pgt_lock = &pgd_page_get_mm(page)->page_table_lock; 617d34d9e5d8326 Jeremy Fitzhardinge 2010-09-21 280 617d34d9e5d8326 Jeremy Fitzhardinge 2010-09-21 281 spin_lock(pgt_lock); 86cf69f1d893d48 Joerg Roedel 2020-06-01 282 vmalloc_sync_one(page_address(page), addr); 617d34d9e5d8326 Jeremy Fitzhardinge 2010-09-21 283 spin_unlock(pgt_lock); f2f13a8535174db Ingo Molnar 2009-02-20 284 } a79e53d85683c6d Andrea Arcangeli 2011-02-16 285 spin_unlock(&pgd_lock); f2f13a8535174db Ingo Molnar 2009-02-20 286 } f2f13a8535174db Ingo Molnar 2009-02-20 287 } f2f13a8535174db Ingo Molnar 2009-02-20 288 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki