linux-kernel - Re: [PATCH v6 11/15] mm: define clear_pages(), clear_user

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Message-ID: <202509030341.jBuh7Fma-lkp@intel.com>
Date: Wed, 3 Sep 2025 03:56:55 +0800
From: kernel test robot <lkp@...el.com>
To: Ankur Arora <ankur.a.arora@...cle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, x86@...nel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	akpm@...ux-foundation.org, david@...hat.com, bp@...en8.de,
	dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
	mjguzik@...il.com, luto@...nel.org, peterz@...radead.org,
	acme@...nel.org, namhyung@...nel.org, tglx@...utronix.de,
	willy@...radead.org, raghavendra.kt@....com,
	boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
	ankur.a.arora@...cle.com
Subject: Re: [PATCH v6 11/15] mm: define clear_pages(), clear_user_pages()

Hi Ankur,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Ankur-Arora/perf-bench-mem-Remove-repetition-around-time-measurement/20250902-161417
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20250902080816.3715913-12-ankur.a.arora%40oracle.com
patch subject: [PATCH v6 11/15] mm: define clear_pages(), clear_user_pages()
config: arm-randconfig-002-20250903 (https://download.01.org/0day-ci/archive/20250903/202509030341.jBuh7Fma-lkp@intel.com/config)
compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250903/202509030341.jBuh7Fma-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/202509030341.jBuh7Fma-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/arm/kernel/asm-offsets.c:12:
>> include/linux/mm.h:3886:3: error: call to undeclared function 'clear_user_page'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                   clear_user_page(addr + i * PAGE_SIZE,
                   ^
   include/linux/mm.h:3886:3: note: did you mean 'clear_user_pages'?
   include/linux/mm.h:3882:20: note: 'clear_user_pages' declared here
   static inline void clear_user_pages(void *addr, unsigned long vaddr,
                      ^
   1 error generated.
   make[3]: *** [scripts/Makefile.build:182: arch/arm/kernel/asm-offsets.s] Error 1 shuffle=1003087465
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1282: prepare0] Error 2 shuffle=1003087465
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2 shuffle=1003087465
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2 shuffle=1003087465
   make: Target 'prepare' not remade because of errors.


vim +/clear_user_page +3886 include/linux/mm.h

  3880	
  3881	#ifndef clear_user_pages
  3882	static inline void clear_user_pages(void *addr, unsigned long vaddr,
  3883					    struct page *pg, unsigned int npages)
  3884	{
  3885		for (int i = 0; i < npages; i++)
> 3886			clear_user_page(addr + i * PAGE_SIZE,
  3887					vaddr + i * PAGE_SIZE, pg + i);
  3888	}
  3889	#endif
  3890	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki