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-rw-r--r--arch/sh/include/asm/fixmap.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/sh/include/asm/fixmap.h b/arch/sh/include/asm/fixmap.h
index 76c5a3099cb..5ac1e40a511 100644
--- a/arch/sh/include/asm/fixmap.h
+++ b/arch/sh/include/asm/fixmap.h
@@ -46,9 +46,15 @@
* fix-mapped?
*/
enum fixed_addresses {
+ /*
+ * The FIX_CMAP entries are used by kmap_coherent() to get virtual
+ * addresses which are of a known color, and so their values are
+ * important. __fix_to_virt(FIX_CMAP_END - n) must give an address
+ * which is the same color as a page (n<<PAGE_SHIFT).
+ */
#define FIX_N_COLOURS 8
FIX_CMAP_BEGIN,
- FIX_CMAP_END = FIX_CMAP_BEGIN + (FIX_N_COLOURS * NR_CPUS),
+ FIX_CMAP_END = FIX_CMAP_BEGIN + (FIX_N_COLOURS * NR_CPUS) - 1,
FIX_UNCACHED,
#ifdef CONFIG_HIGHMEM
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */