linux-kernel - Re: [PATCH 1/1] edac x38: new MC driver module

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Date:	Sun, 30 Nov 2008 09:37:00 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Hitoshi Mitake <h.mitake@...il.com>
Cc:	Sam Ravnborg <sam@...nborg.org>, "H. Peter Anvin" <hpa@...or.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"Luck, Tony" <tony.luck@...el.com>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Doug Thompson <norsk5@...oo.com>, dougthompson@...ssion.com,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 1/1] edac x38: new MC driver module


* Hitoshi Mitake <h.mitake@...il.com> wrote:

> On Sat, 29 Nov 2008 19:01:44 +0100
> Sam Ravnborg <sam@...nborg.org> wrote:
> 
> > I see both rationales and you combine them in your patch - OK.
> > 
> > And the reason why you cannot just add this to
> > include/linux/io.h is that not all architectures
> > provide a readl()/writel() I assume.
> >
> Yes, I can't say all architectures provide readl/writel.
> And there may be some architecture depended problems,
> so I can't decide to add my readq/writeq as architecture independent ones.
> 
> > Feel free to add my Acked-by: to the patch.
> 
> Thanks, I added your Acked-by to new patch.

applied to tip/x86/io, thanks! I also did the small cleanup below.

	Ingo

------------>
>From 458102461ccedc3ab7847132b5db6a53782dc9a8 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@...e.hu>
Date: Sun, 30 Nov 2008 09:33:55 +0100
Subject: [PATCH] x86: provide readq()/writeq() on 32-bit too, cleanup

Impact: cleanup

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/include/asm/io.h |   17 +++++++----------
 1 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 2594644..3ccfaf6 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -55,21 +55,17 @@ build_mmio_write(__writeq, "q", unsigned long, "r", )
 #define __raw_readq __readq
 #define __raw_writeq writeq
 
-/* Let people know we have them */
-#define readq readq
-#define writeq writeq
-
 #else  /* CONFIG_X86_32 from here */
 
 static inline __u64 readq(const volatile void __iomem *addr)
 {
 	const volatile u32 __iomem *p = addr;
-	u32 l, h;
+	u32 low, high;
 
-	l = readl(p);
-	h = readl(p + 1);
+	low = readl(p);
+	high = readl(p + 1);
 
-	return l + ((u64)h << 32);
+	return low + ((u64)high << 32);
 }
 
 static inline void writeq(__u64 val, volatile void __iomem *addr)
@@ -78,11 +74,12 @@ static inline void writeq(__u64 val, volatile void __iomem *addr)
 	writel(val >> 32, addr+4);
 }
 
+#endif
+
+/* Let people know that we have them */
 #define readq		readq
 #define writeq		writeq
 
-#endif
-
 extern int iommu_bio_merge;
 
 #ifdef CONFIG_X86_32
--
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