The patch titled
Subject: mm/shmem.c: make shmem_mapping() inline
has been added to the -mm tree. Its filename is
mm-shmemc-make-shmem_mapping-inline.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-shmemc-make-shmem_mapping-inline.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-shmemc-make-shmem_mapping-inline.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Hui Su <sh_def@xxxxxxx>
Subject: mm/shmem.c: make shmem_mapping() inline
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.
Link: https://lkml.kernel.org/r/20201115165207.GA265355@rlk
Signed-off-by: Hui Su <sh_def@xxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/shmem_fs.h | 6 +++++-
mm/shmem.c | 16 ++++++----------
2 files changed, 11 insertions(+), 11 deletions(-)
--- a/include/linux/shmem_fs.h~mm-shmemc-make-shmem_mapping-inline
+++ a/include/linux/shmem_fs.h
@@ -67,7 +67,11 @@ extern unsigned long shmem_get_unmapped_
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)
{
--- a/mm/shmem.c~mm-shmemc-make-shmem_mapping-inline
+++ a/mm/shmem.c
@@ -246,7 +246,7 @@ static inline void shmem_inode_unacct_bl
}
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 ino
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);
@@ -1879,7 +1879,7 @@ repeat:
}
/* 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;
@@ -2374,11 +2374,6 @@ static struct inode *shmem_get_inode(str
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,
@@ -3887,7 +3882,7 @@ static void shmem_destroy_inodecache(voi
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
@@ -3899,6 +3894,7 @@ static const struct address_space_operat
#endif
.error_remove_page = generic_error_remove_page,
};
+EXPORT_SYMBOL(shmem_aops);
static const struct file_operations shmem_file_operations = {
.mmap = shmem_mmap,
@@ -4334,7 +4330,7 @@ struct page *shmem_read_mapping_page_gfp
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)
_
Patches currently in -mm which might be from sh_def@xxxxxxx are
mmslab_common-use-list_for_each_entry-in-dump_unreclaimable_slab.patch
mm-shmem-use-kmem_cache_zalloc-in-shmem_alloc_inode.patch
mm-shmemc-make-shmem_mapping-inline.patch
mm-page_counter-use-page_counter_read-in-page_counter_set_max.patch
mm-hugetlbc-just-use-put_page_testzero-instead-of-page_count.patch
mm-compaction-move-compaction_suitables-comment-to-right-place.patch
mm-oom_kill-change-comment-and-rename-is_dump_unreclaim_slabs.patch
acctc-use-elif-instead-of-end-and-elif.patch
mm-memcontrol-rewrite-mem_cgroup_page_lruvec.patch
