tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 86799cdfbcd2308cbad6c1dc983b81595b77b639 commit: 559271146efc0bf125e6390191f683eab884e4a1 mm/memcg: optimize user context object stock access date: 5 months ago config: mips-randconfig-r022-20211122 (https://download.01.org/0day-ci/archive/20211128/202111280551.LXsWYt1T-lkp@xxxxxxxxx/config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c133fb321f7ca6083ce15b6aa5bf89de6600e649) 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=559271146efc0bf125e6390191f683eab884e4a1 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 559271146efc0bf125e6390191f683eab884e4a1 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): mm/memcontrol.c:789:20: warning: unused function 'mod_objcg_mlstate' static inline void mod_objcg_mlstate(struct obj_cgroup ^ mm/memcontrol.c:950:29: warning: unused function 'memcg_kmem_bypass' static __always_inline bool memcg_kmem_bypass(void) ^ >> mm/memcontrol.c:2113:33: warning: unused function 'get_obj_stock' static inline struct obj_stock long ^ >> mm/memcontrol.c:2129:20: warning: unused function 'put_obj_stock' static inline void put_obj_stock(unsigned long flags) ^ fatal error: error in backend: Nested variants found in inline asm string: ' .set push .set mips64r2 .if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/atomic.h", .line = 153, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif 1: ll $0, $1 # atomic_add addu $0, $2 sc $0, $1 beqz $0, 1b .set pop ' 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 5162b558d8c0b542e752b037e72a69d5fd51eb1e) Target: mips-unknown-linux Thread model: posix InstalledDir: /opt/cross/clang-5162b558d8/bin clang-14: note: diagnostic msg: Makefile arch block certs crypto drivers fs include init ipc kernel lib mm net nr_bisected scripts security sound source usr virt vim +/get_obj_stock +2113 mm/memcontrol.c 2101 2102 /* 2103 * Most kmem_cache_alloc() calls are from user context. The irq disable/enable 2104 * sequence used in this case to access content from object stock is slow. 2105 * To optimize for user context access, there are now two object stocks for 2106 * task context and interrupt context access respectively. 2107 * 2108 * The task context object stock can be accessed by disabling preemption only 2109 * which is cheap in non-preempt kernel. The interrupt context object stock 2110 * can only be accessed after disabling interrupt. User context code can 2111 * access interrupt object stock, but not vice versa. 2112 */ > 2113 static inline struct obj_stock *get_obj_stock(unsigned long *pflags) 2114 { 2115 struct memcg_stock_pcp *stock; 2116 2117 if (likely(in_task())) { 2118 *pflags = 0UL; 2119 preempt_disable(); 2120 stock = this_cpu_ptr(&memcg_stock); 2121 return &stock->task_obj; 2122 } 2123 2124 local_irq_save(*pflags); 2125 stock = this_cpu_ptr(&memcg_stock); 2126 return &stock->irq_obj; 2127 } 2128 > 2129 static inline void put_obj_stock(unsigned long flags) 2130 { 2131 if (likely(in_task())) 2132 preempt_enable(); 2133 else 2134 local_irq_restore(flags); 2135 } 2136 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
