1 files changed, 4 insertions, 120 deletions

diff --git a/arch/sh/mm/cache-sh4.c b/arch/sh/mm/cache-sh4.c
index b2453bbef4cd..a5c339bca8aa 100644
--- a/arch/sh/mm/cache-sh4.c
+++ b/arch/sh/mm/cache-sh4.c
@@ -170,89 +170,13 @@ static void sh4_flush_cache_all(void *unused)
         flush_icache_all();
 }
 
-static void __flush_cache_mm(struct mm_struct *mm, unsigned long start,
-                             unsigned long end)
-{
-        unsigned long d = 0, p = start & PAGE_MASK;
-        unsigned long alias_mask = boot_cpu_data.dcache.alias_mask;
-        unsigned long n_aliases = boot_cpu_data.dcache.n_aliases;
-        unsigned long select_bit;
-        unsigned long all_aliases_mask;
-        unsigned long addr_offset;
-        pgd_t *dir;
-        pmd_t *pmd;
-        pud_t *pud;
-        pte_t *pte;
-        int i;
-
-        dir = pgd_offset(mm, p);
-        pud = pud_offset(dir, p);
-        pmd = pmd_offset(pud, p);
-        end = PAGE_ALIGN(end);
-
-        all_aliases_mask = (1 << n_aliases) - 1;
-
-        do {
-                if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd))) {
-                        p &= PMD_MASK;
-                        p += PMD_SIZE;
-                        pmd++;
-
-                        continue;
-                }
-
-                pte = pte_offset_kernel(pmd, p);
-
-                do {
-                        unsigned long phys;
-                        pte_t entry = *pte;
-
-                        if (!(pte_val(entry) & _PAGE_PRESENT)) {
-                                pte++;
-                                p += PAGE_SIZE;
-                                continue;
-                        }
-
-                        phys = pte_val(entry) & PTE_PHYS_MASK;
-
-                        if ((p ^ phys) & alias_mask) {
-                                d |= 1 << ((p & alias_mask) >> PAGE_SHIFT);
-                                d |= 1 << ((phys & alias_mask) >> PAGE_SHIFT);
-
-                                if (d == all_aliases_mask)
-                                        goto loop_exit;
-                        }
-
-                        pte++;
-                        p += PAGE_SIZE;
-                } while (p < end && ((unsigned long)pte & ~PAGE_MASK));
-                pmd++;
-        } while (p < end);
-
-loop_exit:
-        addr_offset = 0;
-        select_bit = 1;
-
-        for (i = 0; i < n_aliases; i++) {
-                if (d & select_bit) {
-                        (*__flush_dcache_segment_fn)(addr_offset, PAGE_SIZE);
-                        wmb();
-                }
-
-                select_bit <<= 1;
-                addr_offset += PAGE_SIZE;
-        }
-}
-
 /*
  * Note : (RPC) since the caches are physically tagged, the only point
  * of flush_cache_mm for SH-4 is to get rid of aliases from the
  * D-cache.  The assumption elsewhere, e.g. flush_cache_range, is that
  * lines can stay resident so long as the virtual address they were
  * accessed with (hence cache set) is in accord with the physical
- * address (i.e. tag).  It's no different here.  So I reckon we don't
- * need to flush the I-cache, since aliases don't matter for that.  We
- * should try that.
+ * address (i.e. tag).  It's no different here.
  *
  * Caller takes mm->mmap_sem.
  */
@@ -263,33 +187,7 @@ static void sh4_flush_cache_mm(void *arg)
         if (cpu_context(smp_processor_id(), mm) == NO_CONTEXT)
                 return;
 
-        /*
-         * If cache is only 4k-per-way, there are never any 'aliases'.  Since
-         * the cache is physically tagged, the data can just be left in there.
-         */
-        if (boot_cpu_data.dcache.n_aliases == 0)
-                return;
-
-        /*
-         * Don't bother groveling around the dcache for the VMA ranges
-         * if there are too many PTEs to make it worthwhile.
-         */
-        if (mm->nr_ptes >= MAX_DCACHE_PAGES)
-                flush_dcache_all();
-        else {
-                struct vm_area_struct *vma;
-
-                /*
-                 * In this case there are reasonably sized ranges to flush,
-                 * iterate through the VMA list and take care of any aliases.
-                 */
-                for (vma = mm->mmap; vma; vma = vma->vm_next)
-                        __flush_cache_mm(mm, vma->vm_start, vma->vm_end);
-        }
-
-        /* Only touch the icache if one of the VMAs has VM_EXEC set. */
-        if (mm->exec_vm)
-                flush_icache_all();
+        flush_dcache_all();
 }
 
 /*
@@ -372,24 +270,10 @@ static void sh4_flush_cache_range(void *args)
         if (boot_cpu_data.dcache.n_aliases == 0)
                 return;
 
-        /*
-         * Don't bother with the lookup and alias check if we have a
-         * wide range to cover, just blow away the dcache in its
-         * entirety instead. -- PFM.
-         */
-        if (((end - start) >> PAGE_SHIFT) >= MAX_DCACHE_PAGES)
-                flush_dcache_all();
-        else
-                __flush_cache_mm(vma->vm_mm, start, end);
+        flush_dcache_all();
 
-        if (vma->vm_flags & VM_EXEC) {
-                /*
-                 * TODO: Is this required???  Need to look at how I-cache
-                 * coherency is assured when new programs are loaded to see if
-                 * this matters.
-                 */
+        if (vma->vm_flags & VM_EXEC)
                 flush_icache_all();
-        }
 }
 
 /**