linux-kernel - Re: [patch] cache pipe buf page address for non-highmem arch

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Message-Id: <20070328163416.133d109a.akpm@linux-foundation.org>
Date:	Wed, 28 Mar 2007 16:34:16 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Zach Brown <zach.brown@...cle.com>
Cc:	Ken Chen <kenchen@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch] cache pipe buf page address for non-highmem arch

On Wed, 28 Mar 2007 16:21:04 -0700
Zach Brown <zach.brown@...cle.com> wrote:

> > Does this look OK?
> 
> Almost...
> 
> > #ifdef CONFIG_HIGHMEM
> > static inline void pipe_kunmap_atomic(void *addr, enum km_type type)
> > #else	/* CONFIG_HIGHMEM */
> > static inline void pipe_kunmap_atomic(struct page *page, enum  
> > km_type type)
> 

OK, I give up.  What are you telling me here?

<compiles it>

argh, enum km_type isn't defined if !CONFIG_HIGHMEM, which is extravagantly
dumb.


From: Andrew Morton <akpm@...ux-foundation.org>

Cc: "Ken Chen" <kenchen@...gle.com>
Cc: Zach Brown <zach.brown@...cle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 fs/pipe.c |   31 +++++++++++++++++++++++++------
 1 files changed, 25 insertions(+), 6 deletions(-)

diff -puN fs/pipe.c~cache-pipe-buf-page-address-for-non-highmem-arch-fix-tidy fs/pipe.c
--- a/fs/pipe.c~cache-pipe-buf-page-address-for-non-highmem-arch-fix-tidy
+++ a/fs/pipe.c
@@ -22,17 +22,36 @@
 #include <asm/ioctls.h>
 
 #ifdef CONFIG_HIGHMEM
-#define pipe_kmap		kmap
-#define pipe_kmap_atomic	kmap_atomic
-#define pipe_kunmap		kunmap
-#define pipe_kunmap_atomic	kunmap_atomic
+static inline void *pipe_kmap(struct page *page)
+{
+	return kmap(page);
+}
+
+static inline void pipe_kunmap(struct page *page)
+{
+	kunmap(page);
+}
+
+static inline void *pipe_kmap_atomic(struct page *page, enum km_type type)
+{
+	return kmap_atomic(page, type);
+}
+
+static inline void pipe_kunmap_atomic(void *addr, enum km_type type)
+{
+	kunmap_atomic(addr, type);
+}
 #else	/* CONFIG_HIGHMEM */
 static inline void *pipe_kmap(struct page *page)
 {
-	return (void *) page->private;
+	return (void *)page->private;
 }
+
+static inline void pipe_kunmap(struct page *page)
+{
+}
+
 #define pipe_kmap_atomic(page, type)	pipe_kmap(page)
-#define pipe_kunmap(page)		do { } while (0)
 #define pipe_kunmap_atomic(page, type)	do { } while (0)
 #endif
 
_

-
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