linux-kernel - Build failure in -next

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Message-ID: <20210623223015.GA315292@paulmck-ThinkPad-P17-Gen-1>
Date:   Wed, 23 Jun 2021 15:30:15 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     aneesh.kumar@...ux.ibm.com
Cc:     linux-kernel@...r.kernel.org, linux-next@...r.kernel.org,
        sfr@...b.auug.org.au, elver@...gle.com, ndesaulniers@...gle.com
Subject: Build failure in -next

Hello, Aneesh!

Yesterday evening's next-20210622 testing gave me the following
kernel-build error:

ld: mm/mremap.o: in function `move_huge_pud':
/home/git/linux-next/mm/mremap.c:372: undefined reference to `__compiletime_assert_395'

Bisection landed on this commit:

257121c5aabe ("mm/mremap: convert huge PUD move to separate helper")

I have no idea how this commit relates to that error message, but
reverting this commit on top of next-20210622 really does get rid of
the problem.

The following reproducer provokes this error:

tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --torture lock --configs LOCK07 --build-only --kconfig "CONFIG_DEBUG_LOCK_ALLOC=y CONFIG_PROVE_LOCKING=y" --kmake-arg "CC=clang-11"

Run the above command in the top-level directory of your -next source
tree, and using this compiler:

$ clang-11 -v
Ubuntu clang version 11.1.0-++20210428103817+1fdec59bffc1-1~exp1~20210428204431.166
Target: x86_64-pc-linux-gnu

Thoughts?

							Thanx, Paul