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Subject[PATCH 1/9] sparc/iommu: use !PageHighMem to check if a page has a kernel mapping
Date
This deobsfucates the check a bit, and prepares for future changes.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Guenter Roeck <linux@roeck-us.net>
---
arch/sparc/mm/iommu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c
index e8d5d73ca40d..dcdadac03fdf 100644
--- a/arch/sparc/mm/iommu.c
+++ b/arch/sparc/mm/iommu.c
@@ -273,7 +273,8 @@ static int sbus_iommu_map_sg_pflush(struct device *dev, struct scatterlist *sgl,
* XXX Is this a good assumption?
* XXX What if someone else unmaps it here and races us?
*/
- if ((page = (unsigned long) page_address(sg_page(sg))) != 0) {
+ if (!PageHighMem(sg_page(sg))) {
+ page = (unsigned long)page_address(sg_page(sg));
for (i = 0; i < n; i++) {
if (page != oldpage) { /* Already flushed? */
flush_page_for_dma(page);
--
2.20.1
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