linux-kernel - [linux-rt-devel:linux-5.13.y-rt-testing 57/226] mm/slub.c:376:1: warning: unused function 'slab

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Message-ID: <202107102202.PvaGVzCz-lkp@intel.com>
Date:   Sat, 10 Jul 2021 22:28:09 +0800
From:   kernel test robot <lkp@...el.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: [linux-rt-devel:linux-5.13.y-rt-testing 57/226] mm/slub.c:376:1:
 warning: unused function 'slab_lock'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.13.y-rt-testing
head:   2eb9270f1294b849cb310d6fb1f2675dfb3f9c75
commit: dde8c73f2bd04af94cef72c96424d776537170af [57/226] mm, slub: optionally save/restore irqs in slab_[un]lock()/
config: mips-randconfig-r032-20210709 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe)
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/rt/linux-rt-devel.git/commit/?id=dde8c73f2bd04af94cef72c96424d776537170af
        git remote add linux-rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
        git fetch --no-tags linux-rt-devel linux-5.13.y-rt-testing
        git checkout dde8c73f2bd04af94cef72c96424d776537170af
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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/slub.c:376:1: warning: unused function 'slab_lock'
   slab_lock(struct page unsigned long
   ^
>> mm/slub.c:381:29: warning: unused function 'slab_unlock'
   static __always_inline void slab_unlock(struct page unsigned long
   ^
   mm/slub.c:1507:29: warning: unused function 'node_nr_slabs'
   static inline unsigned long node_nr_slabs(struct kmem_cache_node
   ^
   mm/slub.c:1525:21: warning: unused function 'kmalloc_large_node_hook'
   static inline void size_t size, gfp_t flags)
   ^
   fatal error: error in backend: Nested variants found in inline asm string: ' .set push
   .set mips64r2
   .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/bitops.h", .line = 105, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
   1: ll $0, $1
   or $0, $2
   sc $0, $1
   beqz $0, 1b
   .set pop
   '
   clang-13: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   clang version 13.0.0 (git://gitmirror/llvm_project 8d69635ed9ecf36fd0ca85906bfde17949671cbe)
   Target: mipsel-unknown-linux-gnu
   Thread model: posix
   InstalledDir: /opt/cross/clang-8d69635ed9/bin
   clang-13: note: diagnostic msg:
   Makefile arch block certs crypto drivers fs include init ipc kernel lib mm samples scripts security sound source usr virt


vim +/slab_lock +376 mm/slub.c

   374	
   375	static __always_inline void
 > 376	slab_lock(struct page *page, unsigned long *flags)
   377	{
   378		__slab_lock(page, flags, false);
   379	}
   380	
 > 381	static __always_inline void slab_unlock(struct page *page, unsigned long *flags)
   382	{
   383		__slab_unlock(page, flags, false);
   384	}
   385	

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

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