diff options
Diffstat (limited to 'arch/parisc/kernel/cache.c')
| -rw-r--r-- | arch/parisc/kernel/cache.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c index 3f11331..83335f3 100644 --- a/arch/parisc/kernel/cache.c +++ b/arch/parisc/kernel/cache.c @@ -304,10 +304,20 @@ void flush_dcache_page(struct page *page) offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT; addr = mpnt->vm_start + offset; + /* The TLB is the engine of coherence on parisc: The + * CPU is entitled to speculate any page with a TLB + * mapping, so here we kill the mapping then flush the + * page along a special flush only alias mapping. + * This guarantees that the page is no-longer in the + * cache for any process and nor may it be + * speculatively read in (until the user or kernel + * specifically accesses it, of course) */ + + flush_tlb_page(mpnt, addr); if (old_addr == 0 || (old_addr & (SHMLBA - 1)) != (addr & (SHMLBA - 1))) { __flush_cache_page(mpnt, addr, page_to_phys(page)); if (old_addr) - printk(KERN_ERR "INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %s\n", old_addr, addr, mpnt->vm_file ? mpnt->vm_file->f_path.dentry->d_name.name : "(null)"); + printk(KERN_ERR "INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %s\n", old_addr, addr, mpnt->vm_file ? (char *)mpnt->vm_file->f_path.dentry->d_name.name : "(null)"); old_addr = addr; } } @@ -499,6 +509,7 @@ flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long { BUG_ON(!vma->vm_mm->context); + flush_tlb_page(vma, vmaddr); __flush_cache_page(vma, vmaddr, page_to_phys(pfn_to_page(pfn))); } |