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sh: Factor in cpu id for selection of cache colour fixmap.

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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>
This commit is contained in:
Paul Mundt 2009-09-09 17:14:19 +09:00
parent c4845a4b22
commit f9e2bdfdbb
2 changed files with 6 additions and 4 deletions
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6
arch/sh/include/asm/fixmap.h
View File

@ -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 */

4
arch/sh/mm/kmap.c
View File

@ -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)));