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smaps: fix defined but not used smaps_shmem_walk_ops

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When !CONFIG_SHMEM smaps_shmem_walk_ops is defined but not used,
triggering a compiler warning.  To avoid the warning remove the #ifdef
around the usage.  This has no effect because shmem_mapping() is a stub
returning false when !CONFIG_SHMEM so the code will be compiled out,
however we now need to also provide a stub for shmem_swap_usage().

Link: https://lkml.kernel.org/r/20230405103819.151246-1-steven.price@arm.com
Fixes: 7b86ac3371 ("pagewalk: separate function pointers from iterator data")
Signed-off-by: Steven Price <steven.price@arm.com>
Reported-by: kernel test robot <lkp@intel.com>
  Link: https://lore.kernel.org/oe-kbuild-all/202304031749.UiyJpxzF-lkp@intel.com/
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Steven Price 2023-04-05 11:38:19 +01:00 committed by Andrew Morton
parent 8666925c49
commit b4aca54792
2 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/proc/task_mmu.c
View File

@ -782,7 +782,6 @@ static void smap_gather_stats(struct vm_area_struct *vma,
if (start >= vma->vm_end)
return;
#ifdef CONFIG_SHMEM
if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) {
/*
* For shared or readonly shmem mappings we know that all
@ -803,7 +802,7 @@ static void smap_gather_stats(struct vm_area_struct *vma,
ops = &smaps_shmem_walk_ops;
}
}
#endif
/* mmap_lock is held in m_start */
if (!start)
walk_page_vma(vma, ops, mss);

7
include/linux/shmem_fs.h
View File

@ -96,7 +96,14 @@ int shmem_unuse(unsigned int type);
extern bool shmem_is_huge(struct inode *inode, pgoff_t index, bool shmem_huge_force,
struct mm_struct *mm, unsigned long vm_flags);
#ifdef CONFIG_SHMEM
extern unsigned long shmem_swap_usage(struct vm_area_struct *vma);
#else
static inline unsigned long shmem_swap_usage(struct vm_area_struct *vma)
{
return 0;
}
#endif
extern unsigned long shmem_partial_swap_usage(struct address_space *mapping,
pgoff_t start, pgoff_t end);