MN10300: Allow some cacheflushes to be avoided if cache snooping is available

The AM34 core is able to do cache snooping, and so can skip some of the cache
flushing.

Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 0 insertions, 90 deletions

diff --git a/arch/mn10300/mm/cache.c b/arch/mn10300/mm/cache.c
index 9261217e8d2..bc35826f135 100644
--- a/arch/mn10300/mm/cache.c
+++ b/arch/mn10300/mm/cache.c
@@ -37,96 +37,6 @@ EXPORT_SYMBOL(mn10300_dcache_flush_page);
 #endif
 
 /*
- * write a page back from the dcache and invalidate the icache so that we can
- * run code from it that we've just written into it
- */
-void flush_icache_page(struct vm_area_struct *vma, struct page *page)
-{
-	mn10300_dcache_flush_page(page_to_phys(page));
-	mn10300_icache_inv();
-}
-EXPORT_SYMBOL(flush_icache_page);
-
-/*
- * write some code we've just written back from the dcache and invalidate the
- * icache so that we can run that code
- */
-void flush_icache_range(unsigned long start, unsigned long end)
-{
-#ifdef CONFIG_MN10300_CACHE_WBACK
-	unsigned long addr, size, base, off;
-	struct page *page;
-	pgd_t *pgd;
-	pud_t *pud;
-	pmd_t *pmd;
-	pte_t *ppte, pte;
-
-	if (end > 0x80000000UL) {
-		/* addresses above 0xa0000000 do not go through the cache */
-		if (end > 0xa0000000UL) {
-			end = 0xa0000000UL;
-			if (start >= end)
-				return;
-		}
-
-		/* kernel addresses between 0x80000000 and 0x9fffffff do not
-		 * require page tables, so we just map such addresses directly */
-		base = (start >= 0x80000000UL) ? start : 0x80000000UL;
-		mn10300_dcache_flush_range(base, end);
-		if (base == start)
-			goto invalidate;
-		end = base;
-	}
-
-	for (; start < end; start += size) {
-		/* work out how much of the page to flush */
-		off = start & (PAGE_SIZE - 1);
-
-		size = end - start;
-		if (size > PAGE_SIZE - off)
-			size = PAGE_SIZE - off;
-
-		/* get the physical address the page is mapped to from the page
-		 * tables */
-		pgd = pgd_offset(current->mm, start);
-		if (!pgd || !pgd_val(*pgd))
-			continue;
-
-		pud = pud_offset(pgd, start);
-		if (!pud || !pud_val(*pud))
-			continue;
-
-		pmd = pmd_offset(pud, start);
-		if (!pmd || !pmd_val(*pmd))
-			continue;
-
-		ppte = pte_offset_map(pmd, start);
-		if (!ppte)
-			continue;
-		pte = *ppte;
-		pte_unmap(ppte);
-
-		if (pte_none(pte))
-			continue;
-
-		page = pte_page(pte);
-		if (!page)
-			continue;
-
-		addr = page_to_phys(page);
-
-		/* flush the dcache and invalidate the icache coverage on that
-		 * region */
-		mn10300_dcache_flush_range2(addr + off, size);
-	}
-#endif
-
-invalidate:
-	mn10300_icache_inv();
-}
-EXPORT_SYMBOL(flush_icache_range);
-
-/*
  * allow userspace to flush the instruction cache
  */
 asmlinkage long sys_cacheflush(unsigned long start, unsigned long end)