linux-kernel - linux-next: build failure after merge of the cgroup tree

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Date:   Tue, 11 May 2021 10:51:14 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Tejun Heo <tj@...nel.org>
Cc:     Roman Gushchin <guro@...com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the cgroup tree

Hi all,

After merging the cgroup tree, today's linux-next build (powerpc
ppc64_defconfig) failed like this:

In file included from include/linux/string.h:6,
In file included from include/linux/string.h:6,
                 from arch/powerpc/include/asm/paca.h:15,
                 from arch/powerpc/include/asm/current.h:13,
                 from include/linux/sched.h:12,
                 from include/linux/cgroup.h:12,
                 from kernel/cgroup/cgroup-internal.h:5,
                 from kernel/cgroup/cgroup.c:31:
kernel/cgroup/cgroup.c: In function 'cgroup_exit':
kernel/cgroup/cgroup.c:6270:17: error: 'task' undeclared (first use in this function); did you mean 'tsk'?
 6270 |  if (unlikely(!(task->flags & PF_KTHREAD) &&
      |                 ^~~~
include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
   78 | # define unlikely(x) __builtin_expect(!!(x), 0)
      |                                          ^
kernel/cgroup/cgroup.c:6270:17: note: each undeclared identifier is reported only once for each function it appears in
 6270 |  if (unlikely(!(task->flags & PF_KTHREAD) &&
      |                 ^~~~
include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
   78 | # define unlikely(x) __builtin_expect(!!(x), 0)
      |                                          ^

Caused by commit

  c740aad01e41 ("cgroup: inline cgroup_task_freeze()")

I have used the cgroup tree from next-20210510 for today.

-- 
Cheers,
Stephen Rothwell

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