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From: Arnd Bergmann <arnd@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	x86@kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>, "H. Peter Anvin" <hpa@zytor.com>,
	Dave Jiang <dave.jiang@intel.com>,
	Tony Luck <tony.luck@intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Ben Widawsky <ben.widawsky@intel.com>,
	Ricardo Neri <ricardo.neri-calderon@linux.intel.com>,
	Arvind Sankar <nivedita@alum.mit.edu>,
	Peter Zijlstra <peterz@infradead.org>,
	Vinod Koul <vkoul@kernel.org>,
	linux-kernel@vger.kernel.org
Subject: [PATCH] x86/asm: fix gcc-5 enqcmds() build failure
Date: Mon,  2 Aug 2021 16:53:42 +0200	[thread overview]
Message-ID: <20210802145356.1154321-1-arnd@kernel.org> (raw)

From: Arnd Bergmann <arnd@arndb.de>

Building drivers/dma/idxd/submit.o with gcc-5.5 results in a cryptic
error messages:

arch/x86/include/asm/special_insns.h: Assembler messages:
arch/x86/include/asm/special_insns.h:286: Error: operand size mismatch for `setz'
make[5]: *** [scripts/Makefile.build:272: drivers/dma/idxd/submit.o] Error 1

It seems that this happens for 32-bit arguments when the instruction
expects an 8-bit argument. Change the type of the local variable
accordingly to get a clean build.

Fixes: 7f5933f81bd8 ("x86/asm: Add an enqcmds() wrapper for the ENQCMDS instruction")
Fixes: 8e50d392652f ("dmaengine: idxd: Add shared workqueue support") # guessed
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/x86/include/asm/special_insns.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index f3fbb84ff8a7..33264839f99e 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -275,7 +275,7 @@ static inline int enqcmds(void __iomem *dst, const void *src)
 {
 	const struct { char _[64]; } *__src = src;
 	struct { char _[64]; } __iomem *__dst = dst;
-	int zf;
+	u8 zf;
 
 	/*
 	 * ENQCMDS %(rdx), rax
-- 
2.29.2


             reply	other threads:[~2021-08-02 14:54 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 14:53 Arnd Bergmann [this message]
2021-08-02 15:22 ` Dave Jiang
2021-08-02 16:15 ` H. Peter Anvin

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