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SubjectRe: [PATCH v3] mm/shmem.c: make shmem_mapping() inline
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On 11/15/20 5:52 PM, Hui Su wrote:
> shmem_mapping() isn't worth an out-of-line call
> from any callsite.
>
> So make it inline by
> - make shmem_aops global
> - export shmem_aops
> - inline the shmem_mapping()
>
> and replace the direct call 'shmem_aops' with shmem_mapping()
> in shmem.c.
>
> v1->v2:
> remove the inline for func declaration in shmem_fs.h
>
> v2->v3:
> make shmem_aops global, and export it to modules.
>
> Signed-off-by: Hui Su <sh_def@163.com>

Acked-by: Vlastimil Babka <vbabka@suse.cz>

> ---
> include/linux/shmem_fs.h | 6 +++++-
> mm/shmem.c | 16 ++++++----------
> 2 files changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
> index a5a5d1d4d7b1..d82b6f396588 100644
> --- a/include/linux/shmem_fs.h
> +++ b/include/linux/shmem_fs.h
> @@ -67,7 +67,11 @@ extern unsigned long shmem_get_unmapped_area(struct file *, unsigned long addr,
> unsigned long len, unsigned long pgoff, unsigned long flags);
> extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
> #ifdef CONFIG_SHMEM
> -extern bool shmem_mapping(struct address_space *mapping);
> +extern const struct address_space_operations shmem_aops;
> +static inline bool shmem_mapping(struct address_space *mapping)
> +{
> + return mapping->a_ops == &shmem_aops;
> +}
> #else
> static inline bool shmem_mapping(struct address_space *mapping)
> {
> diff --git a/mm/shmem.c b/mm/shmem.c
> index 537c137698f8..b7361fce50bc 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -246,7 +246,7 @@ static inline void shmem_inode_unacct_blocks(struct inode *inode, long pages)
> }
>
> static const struct super_operations shmem_ops;
> -static const struct address_space_operations shmem_aops;
> +const struct address_space_operations shmem_aops;
> static const struct file_operations shmem_file_operations;
> static const struct inode_operations shmem_inode_operations;
> static const struct inode_operations shmem_dir_inode_operations;
> @@ -1152,7 +1152,7 @@ static void shmem_evict_inode(struct inode *inode)
> struct shmem_inode_info *info = SHMEM_I(inode);
> struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
>
> - if (inode->i_mapping->a_ops == &shmem_aops) {
> + if (shmem_mapping(inode->i_mapping)) {
> shmem_unacct_size(info->flags, inode->i_size);
> inode->i_size = 0;
> shmem_truncate_range(inode, 0, (loff_t)-1);
> @@ -1858,7 +1858,7 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index,
> }
>
> /* shmem_symlink() */
> - if (mapping->a_ops != &shmem_aops)
> + if (!shmem_mapping(mapping))
> goto alloc_nohuge;
> if (shmem_huge == SHMEM_HUGE_DENY || sgp_huge == SGP_NOHUGE)
> goto alloc_nohuge;
> @@ -2352,11 +2352,6 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
> return inode;
> }
>
> -bool shmem_mapping(struct address_space *mapping)
> -{
> - return mapping->a_ops == &shmem_aops;
> -}
> -
> static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
> pmd_t *dst_pmd,
> struct vm_area_struct *dst_vma,
> @@ -3865,7 +3860,7 @@ static void shmem_destroy_inodecache(void)
> kmem_cache_destroy(shmem_inode_cachep);
> }
>
> -static const struct address_space_operations shmem_aops = {
> +const struct address_space_operations shmem_aops = {
> .writepage = shmem_writepage,
> .set_page_dirty = __set_page_dirty_no_writeback,
> #ifdef CONFIG_TMPFS
> @@ -3877,6 +3872,7 @@ static const struct address_space_operations shmem_aops = {
> #endif
> .error_remove_page = generic_error_remove_page,
> };
> +EXPORT_SYMBOL(shmem_aops);
>
> static const struct file_operations shmem_file_operations = {
> .mmap = shmem_mmap,
> @@ -4312,7 +4308,7 @@ struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
> struct page *page;
> int error;
>
> - BUG_ON(mapping->a_ops != &shmem_aops);
> + BUG_ON(!shmem_mapping(mapping));
> error = shmem_getpage_gfp(inode, index, &page, SGP_CACHE,
> gfp, NULL, NULL, NULL);
> if (error)
>

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