Re: rc4-mm1 and pwc-unofficial: kernel BUG and scheduling while atomic [u]

Martin Schlemmer [c]
2004-10-17T19:58:26Z

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On Sun, 2004-10-17 at 12:00 -0700, William Lee Irwin III wrote:
> On Sun, 2004-10-17 at 02:30 -0700, William Lee Irwin III wrote:
> >> You need to right shift the argument by PAGE_SHIFT.
>
> On Sun, Oct 17, 2004 at 08:35:31PM +0200, Martin Schlemmer [c] wrote:
> > I am trying to get vesafb-tng to work with rc4-mm1, but are not sure
> > when to shift the argument by PAGE_SHIFT, and when not to. The patches
> > from you in rc4-mm1 sometimes shifts the second arg, other times the
> > third, and other times not at all. Is there a easy way for a mostly
> > clueless person to figure out when to shift what argument and when not?
>
> Please point out where these inconsistencies occur and I will repair
> them.
>
> Only the third argument changed, from a physical address to a pfn.
>

Its the vesafb-tng patch
(http://dev.gentoo.org/~spock/projects/vesafb-tng/)
Relevant part:

----
vma.vm_mm = current->active_mm;
vma.vm_page_prot.pgprot = PROT_READ | PROT_EXEC | PROT_WRITE;

ret = remap_page_range(&vma, 0x000000, __pa(mem), REAL_MEM_SIZE, vma.vm_page_prot);
ret += remap_page_range(&vma, 0x0a0000, 0x0a0000, 0x100000 - 0x0a0000, vma.vm_page_prot);
----

I did it as:

----
vma.vm_mm = current->active_mm;
vma.vm_page_prot.pgprot = PROT_READ | PROT_EXEC | PROT_WRITE;

ret = remap_pfn_range(&vma, 0x000000, __pa(mem) >> PAGE_SHIFT, REAL_MEM_SIZE, vma.vm_page_prot);
ret += remap_pfn_range(&vma, 0x0a0000, 0x0a0000, 0x100000 - 0x0a0000, vma.vm_page_prot);
----

Thanks,
--
Martin Schlemmer

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