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authorPaul Mundt <lethal@linux-sh.org>2009-09-09 17:14:19 +0900
committerPaul Mundt <lethal@linux-sh.org>2009-09-09 17:14:19 +0900
commitf9e2bdfdbb4c9da13422b349227be8c7b41dbd44 (patch)
tree0cda3a72cbf51cf4e907e0cbef4dce24a6d08b7e /arch
parentc4845a4b2288a9e5d96a0558e474809028c8aff3 (diff)
sh: Factor in cpu id for selection of cache colour fixmap.
In the SMP VIPT case the page copy/clear ops still perform colouring, care needs to be taken that CPUs don't end up stepping on each other, so we give them a bit of room to work with. At the same time, we reduce the worst-case colouring given that these pages are always consumed. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/sh/include/asm/fixmap.h6
-rw-r--r--arch/sh/mm/kmap.c4
2 files changed, 6 insertions, 4 deletions
diff --git a/arch/sh/include/asm/fixmap.h b/arch/sh/include/asm/fixmap.h
index 721fcc4d5e9..76c5a3099cb 100644
--- a/arch/sh/include/asm/fixmap.h
+++ b/arch/sh/include/asm/fixmap.h
@@ -14,9 +14,9 @@
#define _ASM_FIXMAP_H
#include <linux/kernel.h>
+#include <linux/threads.h>
#include <asm/page.h>
#ifdef CONFIG_HIGHMEM
-#include <linux/threads.h>
#include <asm/kmap_types.h>
#endif
@@ -46,9 +46,9 @@
* fix-mapped?
*/
enum fixed_addresses {
-#define FIX_N_COLOURS 16
+#define FIX_N_COLOURS 8
FIX_CMAP_BEGIN,
- FIX_CMAP_END = FIX_CMAP_BEGIN + FIX_N_COLOURS,
+ FIX_CMAP_END = FIX_CMAP_BEGIN + (FIX_N_COLOURS * NR_CPUS),
FIX_UNCACHED,
#ifdef CONFIG_HIGHMEM
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
diff --git a/arch/sh/mm/kmap.c b/arch/sh/mm/kmap.c
index 16e01b5fed0..15d74ea4209 100644
--- a/arch/sh/mm/kmap.c
+++ b/arch/sh/mm/kmap.c
@@ -39,7 +39,9 @@ void *kmap_coherent(struct page *page, unsigned long addr)
pagefault_disable();
idx = FIX_CMAP_END -
- ((addr & current_cpu_data.dcache.alias_mask) >> PAGE_SHIFT);
+ (((addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1)) +
+ (FIX_N_COLOURS * smp_processor_id()));
+
vaddr = __fix_to_virt(idx);
BUG_ON(!pte_none(*(kmap_coherent_pte - idx)));