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From: Tejun Heo <tj@kernel.org>
To: Linus Torvalds <torvalds@linuxfoundation.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
	Michal Koutny <mkoutny@suse.com>, Jens Axboe <axboe@kernel.dk>,
	Kees Cook <keescook@chromium.org>,
	Oleg Nesterov <oleg@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Jim Newsome <jnewsome@torproject.org>,
	Alexey Gladkov <legion@kernel.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Jann Horn <jannh@google.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Security Officers <security@kernel.org>,
	Kernel Team <kernel-team@fb.com>
Subject: Re: [PATCH 2/6] cgroup: Allocate cgroup_file_ctx for kernfs_open_file->priv
Date: Fri, 10 Dec 2021 09:06:21 -1000	[thread overview]
Message-ID: <YbOlLawFDdS0hkpd@slm.duckdns.org> (raw)
In-Reply-To: <CAHk-=wgVUBc+9UVYp=uhyqTTw-QTHNrJow1Av+1jB4_Va93m1A@mail.gmail.com>

On Fri, Dec 10, 2021 at 10:45:33AM -0800, Linus Torvalds wrote:
> But if it then ever becomes a possible source of confusion and it's
> not obvious from the context who uses what, I'd rather use the extra 8
> bytes in the allocation.
> 
> Ok?

Just so that I'm understanding you correctly. The following is what I was
suggesting. ie. just dropping the union and making the iterator embedded:

  struct cgroup_file_ctx {
          struct cgroup_namespace         ns;

          struct {
                  struct css_task_iter    it;
          } procs;

          struct {
                  void                    *trigger;
          } psi;
  };

and I was wondering whether you wanted something like the following:

  struct cgroup_file_ctx {
          struct cgroup_namespace         ns;
          struct css_task_iter            it;
          void                            *trigger;
  };

Thanks.

-- 
tejun

  reply	other threads:[~2021-12-10 19:06 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-09 21:47 [PATCHSET cgroup/for-5.16-fixes] cgroup: Use open-time creds and namespace for migration perm checks Tejun Heo
2021-12-09 21:47 ` [PATCH 1/6] cgroup: Use open-time credentials for process migraton " Tejun Heo
2021-12-10 17:41   ` Linus Torvalds
2021-12-09 21:47 ` [PATCH 2/6] cgroup: Allocate cgroup_file_ctx for kernfs_open_file->priv Tejun Heo
2021-12-10 17:53   ` Linus Torvalds
2021-12-10 18:38     ` Tejun Heo
2021-12-10 18:45       ` Linus Torvalds
2021-12-10 19:06         ` Tejun Heo [this message]
2021-12-10 19:14           ` Linus Torvalds
2021-12-09 21:47 ` [PATCH 3/6] cgroup: Use open-time cgroup namespace for process migration perm checks Tejun Heo
2021-12-09 21:47 ` [PATCH 4/6] selftests: cgroup: Make cg_create() use 0755 for permission instead of 0644 Tejun Heo
2021-12-09 21:47 ` [PATCH 5/6] selftests: cgroup: Test open-time credential usage for migration checks Tejun Heo
2021-12-09 21:47 ` [PATCH 6/6] selftests: cgroup: Test open-time cgroup namespace " Tejun Heo
2021-12-13 19:18 [PATCHSET v2 cgroup/for-5.16-fixes] cgroup: Use open-time creds and namespace for migration perm checks Tejun Heo
2021-12-13 19:18 ` [PATCH 2/6] cgroup: Allocate cgroup_file_ctx for kernfs_open_file->priv Tejun Heo
2021-12-13 19:29   ` Linus Torvalds
2021-12-13 19:56     ` Tejun Heo
2021-12-14 17:03   ` Michal Koutný

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