On 7/10/2013 4:19 PM, Alex Ivanov wrote:
Sorry for not CC'ing to the list.
10.07.2013, 03:35, "John David Anglin" <dave.anglin@xxxxxxxx>:
On 9-Jul-13, at 4:59 PM, John David Anglin wrote:
On 7/9/2013 3:45 PM, Alex Ivanov wrote:
The panic on SMP kernel changed to another one:
http://pastebin.com/SfUfd0Un
This is just a guess but I don't think page is valid
if the pfn is not valid. You might try this untested change.
flush_cache_mm might have same problem (i.e., we may need to
check whether the pfn for the pte is valid).
This version compiles and boots on rp3440.
Dave
--
John David Anglin dave.anglin@xxxxxxxx
Dave,
Thank you so much! Your guess looks to be right. After applying of your
patch there was no more KP and X just worked.
I have been studying this issue a bit more. It looks to me as if it
would be better to call
vm_normal_page to get the page. It returns NULL when we a have special
mapping that
doesn't want to be associated with a struct page. See comment in
mm/memory.c.
I'll send a patch when I get a chance to test this approach.
Dave
--
John David Anglin dave.anglin@xxxxxxxx
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