linux-kernel - [PATCH] x86/asm: Fix setz size enqcmds() build failure

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Date:   Fri, 10 Sep 2021 15:33:32 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Kees Cook <keescook@...omium.org>, Arnd Bergmann <arnd@...db.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        kernel test robot <lkp@...el.com>,
        Ben Widawsky <ben.widawsky@...el.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Tony Luck <tony.luck@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: [PATCH] x86/asm: Fix setz size enqcmds() build failure

When building under GCC 4.9 and 5.5:

arch/x86/include/asm/special_insns.h: Assembler messages:
arch/x86/include/asm/special_insns.h:286: Error: operand size mismatch for `setz'

Fix the type to "bool" for condition code arguments, as documented.

Fixes: 7f5933f81bd8 ("x86/asm: Add an enqcmds() wrapper for the ENQCMDS instruction")
Co-developed-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: x86@...nel.org
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Dave Jiang <dave.jiang@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: kernel test robot <lkp@...el.com>
Cc: Ben Widawsky <ben.widawsky@...el.com>
Cc: Arvind Sankar <nivedita@...m.mit.edu>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
I tripped over this myself, but I found Arnd's version, so this is
basically a v2 of:
https://lore.kernel.org/lkml/20210802145356.1154321-1-arnd@kernel.org/
---
 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..68c257a3de0d 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;
+	bool zf;
 
 	/*
 	 * ENQCMDS %(rdx), rax
-- 
2.30.2