linux-kernel - Re: [tip:core/rseq 25/39] include/linux/rseq_entry.h:132:3: error: invalid operand for instruction

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Message-ID: <20251125233933.GA1102709@ax162>
Date: Tue, 25 Nov 2025 16:39:33 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, kernel test robot <lkp@...el.com>,
	llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Ingo Molnar <mingo@...nel.org>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [tip:core/rseq 25/39] include/linux/rseq_entry.h:132:3: error:
 invalid operand for instruction

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