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Subjectmm/memcontrol.c:1058:29: warning: unused function 'memcg_kmem_bypass'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: c5c17547b778975b3d83a73c8d84e8fb5ecf3ba5
commit: b4e0b68fbd9d1fd7e31cbe8adca3ad6cf556e2ee mm: memcontrol: use obj_cgroup APIs to charge kmem pages
date: 7 months ago
config: mips-randconfig-r022-20211122 (https://download.01.org/0day-ci/archive/20211127/202111271029.EeYluWMG-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=b4e0b68fbd9d1fd7e31cbe8adca3ad6cf556e2ee
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout b4e0b68fbd9d1fd7e31cbe8adca3ad6cf556e2ee
# 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:1058:29: warning: unused function 'memcg_kmem_bypass'
static __always_inline bool memcg_kmem_bypass(void)
^
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 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 +/memcg_kmem_bypass +1058 mm/memcontrol.c

279c3393e2c1133 Roman Gushchin 2020-10-17 1057
4127c6504f25c4f Roman Gushchin 2020-10-17 @1058 static __always_inline bool memcg_kmem_bypass(void)
4127c6504f25c4f Roman Gushchin 2020-10-17 1059 {
4127c6504f25c4f Roman Gushchin 2020-10-17 1060 /* Allow remote memcg charging from any context. */
4127c6504f25c4f Roman Gushchin 2020-10-17 1061 if (unlikely(active_memcg()))
4127c6504f25c4f Roman Gushchin 2020-10-17 1062 return false;
4127c6504f25c4f Roman Gushchin 2020-10-17 1063
4127c6504f25c4f Roman Gushchin 2020-10-17 1064 /* Memcg to charge can't be determined. */
4127c6504f25c4f Roman Gushchin 2020-10-17 1065 if (in_interrupt() || !current->mm || (current->flags & PF_KTHREAD))
4127c6504f25c4f Roman Gushchin 2020-10-17 1066 return true;
4127c6504f25c4f Roman Gushchin 2020-10-17 1067
4127c6504f25c4f Roman Gushchin 2020-10-17 1068 return false;
4127c6504f25c4f Roman Gushchin 2020-10-17 1069 }
4127c6504f25c4f Roman Gushchin 2020-10-17 1070

:::::: The code at line 1058 was first introduced by commit
:::::: 4127c6504f25c4fcff52dc996efda2ef859dd661 mm: kmem: enable kernel memcg accounting from interrupt contexts

:::::: TO: Roman Gushchin <guro@fb.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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

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