Re: [Libhugetlbfs-devel] libbugetlbfs: Test case for powerpc huge_ptep_set_wrprotect() bug

On 07.07.2008 [17:19:55 +1000], David Gibson wrote:

Until very recently (in fact, even now in mainline) powerpc kernels
had a bug in huge_ptep_set_wrprotect() which meant the 'huge' flag was
not passed down to pte_update() and hpte_need_flush().  This meant the
hash ptes for hugepages would not be correctly flushed on fork(),
allowing the parent to pollute the child's mapping after the fork().

This patch adds a testcase to libhugetlbfs for this behaviour, also
doing some other checking of the COW semantics over a fork().

Signed-off-by: David Gibson <redacted>

Applied, thanks,
Nish
-- 
Nishanth Aravamudan [off-list ref]
IBM Linux Technology Center