linux-kernel - [PATCH RFC] riscv: Allow to build only with LLVM >= 17.0.0

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Message-Id: <20240717111716.157149-1-alexghiti@rivosinc.com>
Date: Wed, 17 Jul 2024 13:17:16 +0200
From: Alexandre Ghiti <alexghiti@...osinc.com>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Björn Töpel <bjorn@...osinc.com>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Nathan Chancellor <nathan@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Cc: kernel test robot <lkp@...el.com>
Subject: [PATCH RFC] riscv: Allow to build only with LLVM >= 17.0.0

The following build failure happens when using LLVM < 17.0.0:

kernel/sched/core.c:11873:7: error: cannot jump from this asm goto statement to one of its possible targets

This is a known issue [1] so let's upgrade the minimal requirement for
LLVM to the version 17.0.0, which is the first version to contain the
fix.

Link: https://github.com/ClangBuiltLinux/linux/issues/1886#issuecomment-1645979992 [1]
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202407041157.odTZAYZ6-lkp@intel.com/
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
---

This patch was done by Nathan, I'm just sending it as an RFC to get quicker
feedbacks.

I tested it successfully.

Note that the build failure happens on the not-yet merged qspinlock
patchset.

 scripts/min-tool-version.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/min-tool-version.sh b/scripts/min-tool-version.sh
index 91c91201212c..e81eb7ed257d 100755
--- a/scripts/min-tool-version.sh
+++ b/scripts/min-tool-version.sh
@@ -28,6 +28,8 @@ llvm)
 		echo 15.0.0
 	elif [ "$SRCARCH" = loongarch ]; then
 		echo 18.0.0
+	elif [ "$SRCARCH" = riscv ]; then
+		echo 17.0.0
 	else
 		echo 13.0.1
 	fi
-- 
2.39.2