Messages in this thread | | | Subject | RE: [patch 2/4] x86: PAT followup - Remove KERNPG_TABLE from pte entry | Date | Wed, 16 Jan 2008 10:17:56 -0800 | From | "Pallipadi, Venkatesh" <> |
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>-----Original Message----- >From: Mika Penttilä [mailto:mika.penttila@kolumbus.fi] >Sent: Wednesday, January 16, 2008 12:14 AM >To: Pallipadi, Venkatesh >Cc: ak@muc.de; ebiederm@xmission.com; rdreier@cisco.com; >torvalds@linux-foundation.org; gregkh@suse.de; >airlied@skynet.ie; davej@redhat.com; mingo@elte.hu; >tglx@linutronix.de; hpa@zytor.com; akpm@linux-foundation.org; >arjan@infradead.org; Barnes, Jesse; davem@davemloft.net; >linux-kernel@vger.kernel.org; Siddha, Suresh B >Subject: Re: [patch 2/4] x86: PAT followup - Remove >KERNPG_TABLE from pte entry > >venkatesh.pallipadi@intel.com kirjoitti: >> KERNPG_TABLE was a bug in earlier patch. Remove it from pte. >> pte_val() check is redundant as this routine is called >immediately after a >> ptepage is allocated afresh. >> >> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> >> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> >> >> Index: linux-2.6.git/arch/x86/mm/init_64.c >> =================================================================== >> --- linux-2.6.git.orig/arch/x86/mm/init_64.c 2008-01-15 >11:02:23.000000000 -0800 >> +++ linux-2.6.git/arch/x86/mm/init_64.c 2008-01-15 >11:06:37.000000000 -0800 >> @@ -541,9 +541,6 @@ >> if (address >= end) >> break; >> >> - if (pte_val(*pte)) >> - continue; >> - >> /* Nothing to map. Map the null page */ >> if (!(address & (~PAGE_MASK)) && >> (address + PAGE_SIZE <= end) && >> @@ -561,9 +558,9 @@ >> } >> >> if (exec) >> - entry = >_PAGE_NX|_KERNPG_TABLE|_PAGE_GLOBAL|address; >> + entry = _PAGE_NX|_PAGE_GLOBAL|address; >> else >> - entry = _KERNPG_TABLE|_PAGE_GLOBAL|address; >> + entry = _PAGE_GLOBAL|address; >> entry &= __supported_pte_mask; >> set_pte(pte, __pte(entry)); >> } >> >> > >Hmm then what's the point of mapping not present 4k pages for >valid mem >here? >
My bad... Thanks for the catch. I had to replace KERNPG_TABLE by PAGE_KERNEL here.
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