Messages in this thread | | | Date | Thu, 30 Oct 2008 13:21:03 -0700 | From | Arjan van de Ven <> | Subject | Re: [patch] x86: Fix /dev/mem mmap breakage when PAT is disabled |
| |
On Wed, 29 Oct 2008 19:02:03 -0700 Ravikiran G Thirumalai <kiran@scalex86.org> wrote:
> Fix mmap to /dev/mem when CONFIG_X86_PAT is off and > CONFIG_STRICT_DEVMEM is off > > mmap to /dev/mem on kernel memory has been failing since the > introduction of PAT (CONFIG_STRICT_DEVMEM=n case). Seems like > the check to avoid cache aliasing with PAT is kicking in even > when PAT is disabled. The bug seems to have crept in 2.6.26. > > This patch makes sure that mmap to regular kernel memory > succeeds if CONFIG_STRICT_DEVMEM=n and > PAT is disabled. The checks to avoid cache aliasing > still happens if PAT is enabled.
well... technically the aliases are bad without PAT as well...
-- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org
| |