Re: [PATCH v2] mm/ksm: introduce ksm_force for each process

[kernel test robot <lkp@xxxxxxxxx>]

Hi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on next-20220506]
[cannot apply to hnaz-mm/master kees/for-next/pstore linus/master v5.18-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/cgel-zte-gmail-com/mm-ksm-introduce-ksm_force-for-each-process/20220507-094557
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
config: arc-allyesconfig (https://download.01.org/0day-ci/archive/20220507/202205071213.kLZzW7OV-lkp@xxxxxxxxx/config)
compiler: arceb-elf-gcc (GCC) 11.3.0
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
        # https://github.com/intel-lab-lkp/linux/commit/bc6a122b9e10290755c811e7fa23dd60d39303e2
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review cgel-zte-gmail-com/mm-ksm-introduce-ksm_force-for-each-process/20220507-094557
        git checkout bc6a122b9e10290755c811e7fa23dd60d39303e2
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   mm/ksm.c: In function 'ksm_vma_check':
>> mm/ksm.c:343:17: error: 'turn' undeclared (first use in this function)
     343 |                 turn false;
         |                 ^~~~
   mm/ksm.c:343:17: note: each undeclared identifier is reported only once for each function it appears in
>> mm/ksm.c:343:21: error: expected ';' before 'false'
     343 |                 turn false;
         |                     ^~~~~~
         |                     ;


vim +/turn +343 mm/ksm.c

   336	
   337	/* Check if vma is qualified for ksmd scanning */
   338	static bool ksm_vma_check(struct vm_area_struct *vma)
   339	{
   340		unsigned long vm_flags = vma->vm_flags;
   341	
   342		if (!(vma->vm_flags & VM_MERGEABLE) && !(vma->vm_mm->ksm_force))
 > 343			turn false;
   344	
   345		if (vm_flags & (VM_SHARED	| VM_MAYSHARE	|
   346				VM_PFNMAP	| VM_IO | VM_DONTEXPAND |
   347				VM_HUGETLB	| VM_MIXEDMAP))
   348			return false;       /* just ignore this vma*/
   349	
   350		if (vma_is_dax(vma))
   351			return false;
   352	

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