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Date: Wed, 30 Aug 2023 08:33:42 -0700
From: Nathan Chancellor <nathan@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Sasha Levin <sashal@kernel.org>
Cc: stable@vger.kernel.org, llvm@lists.linux.dev,
	Nick Desaulniers <ndesaulniers@google.com>,
	Michael Ellerman <mpe@ellerman.id.au>
Subject: Apply 9451c79bc39e610882bdd12370f01af5004a3c4f to linux-5.4.y
Message-ID: <20230830153342.GA888898@dev-arch.thelio-3990X>
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Hi Greg and Sasha,

Please consider applying commit 9451c79bc39e ("powerpc/pmac/smp: Avoid
unused-variable warnings") to 5.4, as it resolves a build failure that
we see building ppc64_guest_defconfig with clang due to arch/powerpc
compiling with -Werror by default:

  arch/powerpc/platforms/powermac/smp.c:664:26: error: unused variable 'core99_l2_cache' [-Werror,-Wunused-variable]
    664 | volatile static long int core99_l2_cache;
        |                          ^~~~~~~~~~~~~~~
  arch/powerpc/platforms/powermac/smp.c:665:26: error: unused variable 'core99_l3_cache' [-Werror,-Wunused-variable]
    665 | volatile static long int core99_l3_cache;
        |                          ^~~~~~~~~~~~~~~
  2 errors generated.

I have verified that it applies cleanly and does not appear to have any
direct follow up fixes, although commit a4037d1f1fc4 ("powerpc/pmac/smp:
Drop unnecessary volatile qualifier") was in the same area around the
same time so maybe it makes sense to take that one as well but I don't
think it has any functional impact.

Cheers,
Nathan