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Date: Thu, 14 Jul 2005 17:11:24 +0200
From: =?ISO-8859-1?Q?Anton_W=F6llert?= <a.woellert@gmail.com>
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Subject: ptrace on linux 2.6.12 causes oops
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 it's on a tqm850l with mpc850. i've done the following:

in update_mmu_cache:

if (!PageReserved(page)
&& !test_bit(PG_arch_1, &page->flags)) {
// if (vma->vm_mm =3D=3D current->active_mm){
// _tlbie(address);
// __flush_dcache_icache((void *) address);
// } else
__flush_dcache_icache(page _address(page));
// flush_dcache_icache_page(page);

set_bit(PG_arch_1, &page->flags);
}

like it is in ppc64. now it works. the flush_dcache_icache_page calls=20
__flush_dcache_icache_phys, which temporary turns off the mmu for=20
data-addressing. a bit strange i think. but unfortunately i have too less=
=20
knowledge about kernel-internal ppc-stuff :(

anton

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it's on a tqm850l with mpc850. i've done the following:<br>

<br>

in update_mmu_cache:<br>

<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; if (!PageReserved(page)<br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&amp;&amp; !test_bit(PG_arch_1, &amp;page-&gt;flags)) {<br>

//&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (vma-&gt;vm_mm =3D=3D current-&gt;active_mm){<br>
//&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;
_tlbie(address);<br>
//&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;
__flush_dcache_icache((void *) address);<br>

//&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
} else<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
__flush_dcache_icache(page _address(page));<br>
<div id=3D"mb_2">//&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
flush_dcache_icache_page(page);<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
set_bit(PG_arch_1, &amp;page-&gt;flags);<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; }<br>
<br>
like it is in ppc64. now it works. the flush_dcache_icache_page calls
__flush_dcache_icache_phys, which temporary turns off the mmu for
data-addressing. a bit strange i think. but unfortunately i have too
less knowledge about kernel-internal ppc-stuff :(<br>
<br>
anton<br><span class=3D"sg">
</span></div>
<span class=3D"sg">

</span>

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