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Message-ID: <20081030132103.2daff1e1@infradead.org> Date: Thu, 30 Oct 2008 13:21:03 -0700 From: Arjan van de Ven <arjan@...radead.org> To: Ravikiran G Thirumalai <kiran@...lex86.org> Cc: Ingo Molnar <mingo@...e.hu>, venkatesh.pallipadi@...el.com, linux-kernel@...r.kernel.org, tim@...lemp.com, shai@...lex86.org 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@...lex86.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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