[IA64] Port OOM changes to ia64_do_page_fault
Commit d065bd81 (mm: retry page fault when blocking on disk transfer) and commit 37b23e05 (x86,mm: make pagefault killable) The above commits introduced changes into the x86 pagefault handler for making the page fault handler retryable as well as killable. These changes reduce the mmap_sem hold time, which is crucial during OOM killer invocation. Port these changes to ia64. Signed-off-by: Kautuk Consul <consul.kautuk@gmail.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
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