How about if I specify the following flags in my mmap routine just like what the pgprot_noncached micro did. pgprot_val(vma->vm_page_prot) &= ~_CACHE_MASK; pgprot_val(vma->vm_page_prot) |= _CACHE_UNCACHED; Will this have kernel make the mmap'd memory non-cacheable? Or is there a mmap non-cacheable patch? Thanks in advance! Teresa -----Original Message----- From: Jun Sun [mailto:jsun@mvista.com] Sent: Friday, July 25, 2003 3:02 PM To: Teresa Tao Cc: linux-mips@linux-mips.org; jsun@mvista.com Subject: Re: mmap'ed memory cacheable or uncheable On Thu, Jul 24, 2003 at 08:26:59PM -0700, Teresa Tao wrote: > Hi there, > > I got a question regarding the mmap'ed memory. Is the mmap'ed memory cacheable or uncheable? My driver just use the remap_page_range to map a reserved physical memory. > I am pretty much sure it is cached, although I can't pin down exactly where in the mm subsystem it does so - I have had cache bugs related to mmap(). Jun
