linux-kernel - Re: [PATCH -rt] update kmap

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Message-ID: <20061227213150.GA15638@elte.hu>
Date:	Wed, 27 Dec 2006 22:31:50 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -rt] update kmap_atomic on !HIGHMEM


plus on i386 the fix below is needed as well.

	Ingo

---
 include/asm-i386/highmem.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux/include/asm-i386/highmem.h
===================================================================
--- linux.orig/include/asm-i386/highmem.h
+++ linux/include/asm-i386/highmem.h
@@ -81,9 +81,9 @@ struct page *__kmap_atomic_to_page(void 
  * on PREEMPT_RT kmap_atomic() is a wrapper that uses kmap():
  */
 #ifdef CONFIG_PREEMPT_RT
-#  define kmap_atomic(page, type)	kmap(page)
-#  define kmap_atomic_pfn(pfn, type)	kmap(pfn_to_page(pfn))
-#  define kunmap_atomic(kvaddr, type)	kunmap_virt(kvaddr)
+#  define kmap_atomic(page, type)	({ pagefault_disable(); kmap(page); })
+#  define kmap_atomic_pfn(pfn, type)	kmap_atomic(pfn_to_page(pfn), type)
+#  define kunmap_atomic(kvaddr, type)	do { pagefault_enable(); kunmap_virt(kvaddr); } while (0)
 #  define kmap_atomic_to_page(kvaddr)	kmap_to_page(kvaddr)
 #else
 # define kmap_atomic(page, type)	__kmap_atomic(page, type)
-
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