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Date: Tue, 25 Nov 2025 16:39:33 -0700
From: Nathan Chancellor <nathan@kernel.org>
To: "Christophe Leroy (CS GROUP)" <chleroy@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>, kernel test robot <lkp@intel.com>,
	llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	Ingo Molnar <mingo@kernel.org>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [tip:core/rseq 25/39] include/linux/rseq_entry.h:132:3: error:
 invalid operand for instruction
Message-ID: <20251125233933.GA1102709@ax162>
References: <202511250134.i0Jm8d7I-lkp@intel.com>
 <874iqji6n1.ffs@tglx>
 <897c6ba7-e27d-4170-be56-4d0f544bfa42@kernel.org>
 <20251125231834.GA4012217@ax162>
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In-Reply-To: <20251125231834.GA4012217@ax162>

On Tue, Nov 25, 2025 at 04:18:34PM -0700, Nathan Chancellor wrote:
> That avoids the error for me. I notice that this does not reproduce
> beyond clang-16 for me so I am going to bisect LLVM to see what fixes
> this error.

Oh, it is because of commit e2ffa15b9baa ("kbuild: Disable
CC_HAS_ASM_GOTO_OUTPUT on clang < 17"). Prior to that change, all
supported versions of clang would use the CONFIG_CC_HAS_ASM_GOTO_OUTPUT
blocks in arch/powerpc/include/asm/uaccess.h, whereas now clang-15 and
clang-16 will use the variants without asm goto with outputs.

Cheers,
Nathan