linux-kernel - mm/vmalloc.c:472:1: warning: unused function 'compute_subtree_max

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Date:   Thu, 15 Apr 2021 06:46:45 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Uladzislau Rezki (Sony)" <urezki@...il.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: mm/vmalloc.c:472:1: warning: unused function
 'compute_subtree_max_size'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7f75285ca572eaabc028cf78c6ab5473d0d160be
commit: 15ae144f77027db35fad168f24a1b9469dcf70a7 mm/vmalloc: switch to "propagate()" callback
date:   8 months ago
config: mips-randconfig-r023-20210414 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9829f5e6b1bca9b61efc629770d28bb9014dec45)
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=15ae144f77027db35fad168f24a1b9469dcf70a7
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 15ae144f77027db35fad168f24a1b9469dcf70a7
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=mips 

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/vmalloc.c:1300:6: warning: no previous prototype for function 'set_iounmap_nonlazy'
   void set_iounmap_nonlazy(void)
   ^
   mm/vmalloc.c:1300:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void set_iounmap_nonlazy(void)
   ^
   static
>> mm/vmalloc.c:472:1: warning: unused function 'compute_subtree_max_size'
   compute_subtree_max_size(struct vmap_area
   ^
   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 = 80, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
   1: ll $0, $2 # __xchg_asm
   .set pop
   move $$1, ${3:z}
   .set arch=r4000
   sc $$1, $1
   beqz $$1, 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 9829f5e6b1bca9b61efc629770d28bb9014dec45)
   Target: mipsel-unknown-linux-gnu
   Thread model: posix
   InstalledDir: /opt/cross/clang-9829f5e6b1/bin
   clang-13: note: diagnostic msg:
   Makefile arch block certs crypto drivers fs include init ipc kernel lib mm net samples scripts security sound source usr virt


vim +/compute_subtree_max_size +472 mm/vmalloc.c

68ad4a33043353 Uladzislau Rezki (Sony  2019-05-17  467) 
68ad4a33043353 Uladzislau Rezki (Sony  2019-05-17  468) /*
68ad4a33043353 Uladzislau Rezki (Sony  2019-05-17  469)  * Gets called when remove the node and rotate.
68ad4a33043353 Uladzislau Rezki (Sony  2019-05-17  470)  */
68ad4a33043353 Uladzislau Rezki (Sony  2019-05-17  471) static __always_inline unsigned long
68ad4a33043353 Uladzislau Rezki (Sony  2019-05-17 @472) compute_subtree_max_size(struct vmap_area *va)
68ad4a33043353 Uladzislau Rezki (Sony  2019-05-17  473) {
68ad4a33043353 Uladzislau Rezki (Sony  2019-05-17  474) 	return max3(va_size(va),
68ad4a33043353 Uladzislau Rezki (Sony  2019-05-17  475) 		get_subtree_max_size(va->rb_node.rb_left),
68ad4a33043353 Uladzislau Rezki (Sony  2019-05-17  476) 		get_subtree_max_size(va->rb_node.rb_right));
68ad4a33043353 Uladzislau Rezki (Sony  2019-05-17  477) }
68ad4a33043353 Uladzislau Rezki (Sony  2019-05-17  478) 

:::::: The code at line 472 was first introduced by commit
:::::: 68ad4a3304335358f95a417f2a2b0c909e5119c4 mm/vmalloc.c: keep track of free blocks for vmap allocation

:::::: TO: Uladzislau Rezki (Sony) <urezki@...il.com>
:::::: CC: Linus Torvalds <torvalds@...ux-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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