On Tue, 5 Aug 2008, Benjamin Herrenschmidt wrote:
Can you find out where that stupid value comes from ?
I didn't have time to look at in detail, but it fails from the
ioremap call in ps3_map_htab (arch/powerpc/platfroms/ps3/htab.c):
htab = (__force struct hash_pte
arch/powerpc/platfroms/ps3/htab.c:ps3_hpte_updatepp() uses `htab[slot].v'.
Ah, I missed that one. Indeed it -is- used.
Ok, that leaves us with 2 options:
- Change ps3_hpte_updatepp() to not read from the hash table via that
mapping (ie, do you have an LV1 call to read an HPTE ? Do you
You could do that by adding:
if (!(pteflags (_PAGE_USER | _PAGE_RW)))
rflags |= (1 1) | (1 63);
Dbl check that the resulting mapping isn't accessible to user space though.
Make these 1UL x, and a proper patch would have to also test
that the CPU supports the 3rd
Benjamin Herrenschmidt wrote:
arch/powerpc/platfroms/ps3/htab.c:ps3_hpte_updatepp() uses `htab[slot].v'.
Ok, that leaves us with 2 options:
- Change ps3_hpte_updatepp() to not read from the hash table via that
mapping (ie, do you have an LV1 call to read an HPTE ? Do you measure
any
On Mon, 2008-08-04 at 17:48 +0200, Geert Uytterhoeven wrote:
On PS3, recent kernels lock up in the very early stage (i.e. before mere
mortals get to see a working console). The kernel crashes with
| kernel BUG at linux/arch/powerpc/platforms/ps3/htab.c:141!
Bisecting shows this happens
Hi,
Benjamin Herrenschmidt wrote:
ps3_hpte_insert() seems to be called during system initialization with the
following values of rflags:
- first call: 0x190
- initial memory: 0x194 (455 times)
- hotplug memory:
o crash: 0x115
o OK: 0x117
Do you have an idea of
Which should be 0x194.
That is 0x190.
0x194 = _PAGE_EXEC | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX
Right, _PAGE_EXEC should only be set for the part covering the kernel
text. In any case, it shouldn't be what you showed.
Can you find out where that stupid value comes
