linux-kernel - [PATCH] Export kmap_atomic

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Message-Id: <1219779789-8368-3-git-send-email-eric@anholt.net>
Date:	Tue, 26 Aug 2008 12:43:08 -0700
From:	Eric Anholt <eric@...olt.net>
To:	linux-kernel@...r.kernel.org
Cc:	Eric Anholt <eric@...olt.net>
Subject: [PATCH] Export kmap_atomic_pfn for DRM-GEM.

The driver would like to map IO space directly for copying data in when
appropriate, to avoid CPU cache flushing for streaming writes.
kmap_atomic_pfn lets us avoid IPIs associated with ioremap for this process.

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 arch/x86/mm/highmem_32.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c
index 165c871..d52e91d 100644
--- a/arch/x86/mm/highmem_32.c
+++ b/arch/x86/mm/highmem_32.c
@@ -137,6 +137,7 @@ void *kmap_atomic_pfn(unsigned long pfn, enum km_type type)

 	return (void*) vaddr;
 }
+EXPORT_SYMBOL(kmap_atomic_pfn);

 struct page *kmap_atomic_to_page(void *ptr)
 {
-- 
1.5.6.3

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