linux-kernel - [PATCH] x86: fix enqcmds() sparse warning

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Date:   Wed, 06 Jan 2021 13:40:08 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     bp@...en8.de, x86@...nel.org
Cc:     kernel test robot <lkp@...el.com>,
        Ben Widawsky <ben.widawsky@...el.com>,
        dan.j.williams@...el.com, ben.widawsky@...el.com,
        tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86: fix enqcmds() sparse warning

Add missing __iomem anotation to address sparse warning.

"sparse warnings: (new ones prefixed by >>)"
   drivers/dma/idxd/submit.c: note: in included file (through include/linux/io.h, include/linux/pci.h):
   arch/x86/include/asm/io.h:422:27: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void *dst @@     got void [noderef] __iomem *dst @@
   arch/x86/include/asm/io.h:422:27: sparse:     expected void *dst
   arch/x86/include/asm/io.h:422:27: sparse:     got void [noderef] __iomem *dst
   drivers/dma/idxd/submit.c: note: in included file (through arch/x86/include/asm/processor.h, arch/x86/include/asm/timex.h, include/linux/timex.h, ...):
>> arch/x86/include/asm/special_insns.h:289:41: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected struct <noident> *__dst @@     got void [noderef] __iomem *dst @@
   arch/x86/include/asm/special_insns.h:289:41: sparse:     expected struct <noident> *__dst
   arch/x86/include/asm/special_insns.h:289:41: sparse:     got void [noderef] __iomem *dst

Fixes: 7f5933f81bd8 ("x86/asm: Add an enqcmds() wrapper for the ENQCMDS instruction")
Reported-by: kernel test robot <lkp@...el.com>
Reviewed-by: Ben Widawsky <ben.widawsky@...el.com>
Signed-off-by: Dave Jiang <dave.jiang@...el.com>
---
 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 4e234645f0c6..1d3cbaef4bb7 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -286,7 +286,7 @@ static inline void movdir64b(void __iomem *dst, const void *src)
 static inline int enqcmds(void __iomem *dst, const void *src)
 {
 	const struct { char _[64]; } *__src = src;
-	struct { char _[64]; } *__dst = dst;
+	struct { char _[64]; } __iomem *__dst = dst;
 	int zf;
 
 	/*