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>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/sh/mm/kmap.c b/arch/sh/mm/kmap.c
index 16e01b5fed04..15d74ea42094 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)));