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cgroup fixes for v6.1-rc1

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* Fix a recent regression where a sleeping kernfs function is called with
   css_set_lock (spinlock) held.
 
 * Revert the commit to enable cgroup1 support for cgroup_get_from_fd/file().
   Multiple users assume that the lookup only works for cgroup2 and breaks
   when fed a cgroup1 file. Instead, introduce a separate set of functions to
   lookup both v1 and v2 and use them where the user explicitly wants to
   support both versions.
 
 * Compat update for tools/perf/util/bpf_skel/bperf_cgroup.bpf.c.
 
 * Add Josef Bacik as a blkcg maintainer.
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Merge tag 'cgroup-for-6.1-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

Pull cgroup fixes from Tejun Heo:

 - Fix a recent regression where a sleeping kernfs function is called
   with css_set_lock (spinlock) held

 - Revert the commit to enable cgroup1 support for cgroup_get_from_fd/file()

   Multiple users assume that the lookup only works for cgroup2 and
   breaks when fed a cgroup1 file. Instead, introduce a separate set of
   functions to lookup both v1 and v2 and use them where the user
   explicitly wants to support both versions.

 - Compat update for tools/perf/util/bpf_skel/bperf_cgroup.bpf.c.

 - Add Josef Bacik as a blkcg maintainer.

* tag 'cgroup-for-6.1-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  blkcg: Update MAINTAINERS entry
  mm: cgroup: fix comments for get from fd/file helpers
  perf stat: Support old kernels for bperf cgroup counting
  bpf: cgroup_iter: support cgroup1 using cgroup fd
  cgroup: add cgroup_v1v2_get_from_[fd/file]()
  Revert "cgroup: enable cgroup_get_from_file() on cgroup1"
  cgroup: Reorganize css_set_lock and kernfs path processing
This commit is contained in:
Linus Torvalds 2022-10-17 18:52:43 -07:00
commit bb1a114646
4 changed files with 83 additions and 21 deletions
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2
MAINTAINERS
View file

@ -5266,6 +5266,7 @@ F: tools/testing/selftests/cgroup/
CONTROL GROUP - BLOCK IO CONTROLLER (BLKIO)
M: Tejun Heo <tj@kernel.org>
M: Josef Bacik <josef@toxicpanda.com>
M: Jens Axboe <axboe@kernel.dk>
L: cgroups@vger.kernel.org
L: linux-block@vger.kernel.org
@ -5273,6 +5274,7 @@ T: git git://git.kernel.dk/linux-block
F: Documentation/admin-guide/cgroup-v1/blkio-controller.rst
F: block/bfq-cgroup.c
F: block/blk-cgroup.c
F: block/blk-iocost.c
F: block/blk-iolatency.c
F: block/blk-throttle.c
F: include/linux/blk-cgroup.h