[PATCH 0/8] shmem,tmpfs: general maintenance

[Hugh Dickins]

And here is a series of patches based on v6.6-rc3: mostly just cosmetic
mods in mm/shmem.c, but the last two enforcing the "size=" limit better.
8/8 goes into percpu counter territory, and could stand alone: I'll add
some more Cc's on that one.

Applies to any v6.6-rc so far, and to next-20230929 and to
mm-everything-2023-09-29-23-51: hah, there's now an 09-30-01-16,
I haven't tried it yet, but this should be good on that too.

1/8 shmem: shrink shmem_inode_info: dir_offsets in a union
2/8 shmem: remove vma arg from shmem_get_folio_gfp()
3/8 shmem: factor shmem_falloc_wait() out of shmem_fault()
4/8 shmem: trivial tidyups, removing extra blank lines, etc
5/8 shmem: shmem_acct_blocks() and shmem_inode_acct_blocks()
6/8 shmem: move memcg charge out of shmem_add_to_page_cache()
7/8 shmem: _add_to_page_cache() before shmem_inode_acct_blocks()
8/8 shmem,percpu_counter: add _limited_add(fbc, limit, amount)

 include/linux/percpu_counter.h |  23 ++
 include/linux/shmem_fs.h       |  16 +-
 lib/percpu_counter.c           |  53 ++++
 mm/shmem.c                     | 500 +++++++++++++++++------------------
 4 files changed, 333 insertions(+), 259 deletions(-)

Hugh