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authorArjan van dev Ven <arjan@linux.intel.com>2008-02-06 05:16:00 +0100
committerDave Airlie <airlied@linux.ie>2008-02-19 14:46:39 +1000
commitfcea424d31868a78366ad5ee0cb3cc2a4cbe689b (patch)
tree9b3a2be661c07d8b094a5489ecafffe4befe5ec0 /arch/x86
parent16469a0ea0f6b7562eac98ebb8a7c41ce902d0b1 (diff)
fix historic ioremap() abuse in AGP
Several AGP drivers right now use ioremap_nocache() on kernel ram in order to turn a page of regular memory uncached. There are two problems with this: 1) This is a total nightmare for the ioremap() implementation to keep various mappings of the same page coherent. 2) It's a total nightmare for the AGP code since it adds a ton of complexity in terms of keeping track of 2 different pointers to the same thing, in terms of error handling etc etc. This patch fixes this by making the AGP drivers use the new set_memory_XX APIs instead. Note: amd-k7-agp.c is built on Alpha too, and generic.c is built on ia64 as well, which do not yet have the set_memory_*() APIs, so for them some we have a few ugly #ifdefs - hopefully they'll be fixed soon. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Dave Airlie <airlied@linux.ie>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/mm/ioremap.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 9f42d7e9c15..69f4981db80 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -126,6 +126,8 @@ static void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
return NULL;
}
+ WARN_ON_ONCE(page_is_ram(pfn));
+
switch (mode) {
case IOR_MODE_UNCACHED:
default: