This fixes a sporadic oops at boot on G5 Power Macs. The table_end
variable has the address of the last byte of the table. Adding on
PAGE_SIZE means we flush too much, and if the page after the table
is not mapped for any reason, the kernel will oops. Instead we add
on 1 because flush_dcache_range() interprets its second argument as
the first byte past the range to be flushed.
Signed-off-by: Paul Mackerras <pau...@samba.org>
---
diff --git a/drivers/char/agp/uninorth-agp.c b/drivers/char/agp/uninorth-agp.c
index 6f48931..9aaa0eb 100644
--- a/drivers/char/agp/uninorth-agp.c
+++ b/drivers/char/agp/uninorth-agp.c
@@ -413,7 +413,7 @@ static int uninorth_create_gatt_table(struct
agp_bridge_data *bridge)
bridge->gatt_table_real = (u32 *) table;
/* Need to clear out any dirty data still sitting in caches */
flush_dcache_range((unsigned long)table,
- (unsigned long)(table_end + PAGE_SIZE));
+ (unsigned long)table_end + 1);
bridge->gatt_table = vmap(pages, (1 << page_order), 0, PAGE_KERNEL_NCG);
if (bridge->gatt_table == NULL)
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