linux-kernel - linux-next: build failure in Linus' tree

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Message-ID: <20200621120500.1f215007@canb.auug.org.au>
Date:   Sun, 21 Jun 2020 12:05:00 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>
Subject: linux-next: build failure in Linus' tree

Hi all,

Building Linus' tree, today's linux-next build (x86_64 allmodcongig)
failed like this:

In file included from arch/x86/include/asm/atomic.h:5,
                 from include/linux/atomic.h:7,
                 from include/linux/llist.h:51,
                 from include/linux/irq_work.h:5,
                 from kernel/smp.c:10:
kernel/smp.c: In function 'smp_init':
include/linux/compiler.h:392:38: error: call to '__compiletime_assert_869' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct task_struct, wake_entry_type) - offsetof(struct task_struct, wake_entry) != offsetof(struct __call_single_data, flags) - offsetof(struct __call_single_data, llist)
  392 |  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
      |                                      ^
include/linux/compiler.h:373:4: note: in definition of macro '__compiletime_assert'
  373 |    prefix ## suffix();    \
      |    ^~~~~~
include/linux/compiler.h:392:2: note: in expansion of macro '_compiletime_assert'
  392 |  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
      |  ^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
   39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
      |                                     ^~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
   50 |  BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
      |  ^~~~~~~~~~~~~~~~
kernel/smp.c:687:2: note: in expansion of macro 'BUILD_BUG_ON'
  687 |  BUILD_BUG_ON(offsetof(struct task_struct, wake_entry_type) - offsetof(struct task_struct, wake_entry) !=
      |  ^~~~~~~~~~~~

Caused by me starting to build with various GCC_PLUGIN config options set.

I have cherry-picked commit

  bfb9fbe0f7e7 ("sched: Fix RANDSTRUCT build fail")

from the tip tree until it is sent upstream to Linus.

-- 
Cheers,
Stephen Rothwell

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