Timur Tabi wrote:
When you say "older", what exactly do you mean? I have different test that normally fails with just get_user_pages(), but it works with 2.6.9 and above. I haven't been able to get any kernel earlier than 2.6.9 to compile or boot properly, so I'm having a hard time narrowing down the actual point when get_user_pages() started working.
I haven't gotten a reply to this question, but I've done my own research, and I think I found the answer. Using my own test of get_user_pages(), it appears that the fix was placed in 2.6.7. However, I would like to know specifically what the fix is. Unfortunately, tracking this stuff down is beyond my understanding of the Linux VM.
Assuming that the fix is in try_to_unmap_one(), the only significant change I see between 2.6.6 and 2.6.7 is the addition of this code:
pgd = pgd_offset(mm, address);
if (!pgd_present(*pgd))
goto out_unlock; pmd = pmd_offset(pgd, address);
if (!pmd_present(*pmd))
goto out_unlock; pte = pte_offset_map(pmd, address);
if (!pte_present(*pte))
goto out_unmap; if (page_to_pfn(page) != pte_pfn(*pte))
goto out_unmap;Can anyone tell me if this is the actual fix, or at least a major part of the actual fix?
-- Timur Tabi Staff Software Engineer [EMAIL PROTECTED]
One thing a Southern boy will never say is,
"I don't think duct tape will fix it."
-- Ed Smylie, NASA engineer for Apollo 13
_______________________________________________
openib-general mailing list
openib-general@openib.org
http://openib.org/mailman/listinfo/openib-generalTo unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
