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

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Message-ID: <20211018172330.379b2061@canb.auug.org.au>
Date:   Mon, 18 Oct 2021 17:23:30 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Qi Zheng <zhengqi.arch@...edance.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 tip tree

Hi all,

After merging the tip tree, today's linux-next build (x86_64 allnoconfig)
failed like this:

arch/x86/kernel/process.c: In function '__get_wchan':
arch/x86/kernel/process.c:950:2: error: implicit declaration of function 'stack_trace_save_tsk' [-Werror=implicit-function-declaration]
  950 |  stack_trace_save_tsk(p, &entry, 1, 0);
      |  ^~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

Caused by commit

  bc9bbb81730e ("x86: Fix get_wchan() to support the ORC unwinder")

stack_trace_save_tsk() requires CONFIG_STACKTRACE which is not set for
this build.

I have reverted that commit, and commit

  42a20f86dc19 ("sched: Add wrapper for get_wchan() to keep task blocked")

which follows it, for today.

-- 
Cheers,
Stephen Rothwell

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