linux-kernel - mm/mremap.c:215:20: warning: unused function 'arch_supports_page_table

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Date:   Mon, 8 Nov 2021 02:07:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: mm/mremap.c:215:20: warning: unused function
 'arch_supports_page_table_move'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b5013d084e03e82ceeab4db8ae8ceeaebe76b0eb
commit: 3bbda69c48d27474a9e6a90cf4680b295a7efa46 mm/mremap: allow arch runtime override
date:   4 months ago
config: mips-randconfig-c004-20211014 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6c76d0101193aa4eb891a6954ff047eda2f9cf71)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3bbda69c48d27474a9e6a90cf4680b295a7efa46
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 3bbda69c48d27474a9e6a90cf4680b295a7efa46
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> mm/mremap.c:215:20: warning: unused function 'arch_supports_page_table_move'
   static inline bool arch_supports_page_table_move(void)
   ^
   mm/mremap.c:214:39: note: expanded from macro 'arch_supports_page_table_move'
   #define arch_supports_page_table_move arch_supports_page_table_move
   ^
   fatal error: error in backend: Nested variants found in inline asm string: ' .set push
   .set noat
   .set push
   .set arch=r4000
   .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/cmpxchg.h", .line = 163, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
   1: ll $0, $2 # __cmpxchg_asm
   bne $0, ${3:z}, 2f
   .set pop
   move $$1, ${4:z}
   .set arch=r4000
   sc $$1, $1
   beqz $$1, 1b
   .set pop
   2: .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/cmpxchg.h", .line = 163, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
   '
   clang-14: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   clang version 14.0.0 (git://gitmirror/llvm_project cefc01fa65a7ebcc10cbf3c3bb2278a6a122deaf)
   Target: mips-unknown-linux
   Thread model: posix
   InstalledDir: /opt/cross/clang-cefc01fa65/bin
   clang-14: note: diagnostic msg:
   Makefile arch block certs crypto drivers fs include init ipc kernel lib mm nr_bisected scripts security sound source usr virt


vim +/arch_supports_page_table_move +215 mm/mremap.c

   212	
   213	#ifndef arch_supports_page_table_move
   214	#define arch_supports_page_table_move arch_supports_page_table_move
 > 215	static inline bool arch_supports_page_table_move(void)
   216	{
   217		return IS_ENABLED(CONFIG_HAVE_MOVE_PMD) ||
   218			IS_ENABLED(CONFIG_HAVE_MOVE_PUD);
   219	}
   220	#endif
   221	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Download attachment ".config.gz" of type "application/gzip" (28068 bytes)