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Subjectmm/memcontrol.c:2113:33: warning: unused function 'get_obj_stock'
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@intel.com/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@intel.com>

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@lists.01.org

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