linux-kernel - [PATCH] x86/asm: fix gcc-5 enqcmds() build failure

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Date:   Mon,  2 Aug 2021 16:53:42 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org
Cc:     Arnd Bergmann <arnd@...db.de>, "H. Peter Anvin" <hpa@...or.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Ben Widawsky <ben.widawsky@...el.com>,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Peter Zijlstra <peterz@...radead.org>,
        Vinod Koul <vkoul@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] x86/asm: fix gcc-5 enqcmds() build failure

From: Arnd Bergmann <arnd@...db.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@...db.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