Peter Xu 8b9a65fd28 mm: return faster for non-fatal signals in user mode faults ... The idea comes from the upstream discussion between Linus and Andrea: https://lore.kernel.org/lkml/20171102193644.GB22686@redhat.com/ A summary to the issue: there was a special path in handle_userfault() in the past that we'll return a VM_FAULT_NOPAGE when we detected non-fatal signals when waiting for userfault handling. We did that by reacquiring the mmap_sem before returning. However that brings a risk in that the vmas might have changed when we retake the mmap_sem and even we could be holding an invalid vma structure. This patch is a preparation of removing that special path by allowing the page fault to return even faster if we were interrupted by a non-fatal signal during a user-mode page fault handling routine. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Suggested-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Peter Xu <peterx@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Tested-by: Brian Geffon <bgeffon@google.com> Cc: Bobby Powers <bobbypowers@gmail.com> Cc: David Hildenbrand <david@redhat.com> Cc: Denis Plotnikov <dplotnikov@virtuozzo.com> Cc: "Dr . David Alan Gilbert" <dgilbert@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: "Kirill A . Shutemov" <kirill@shutemov.name> Cc: Martin Cracauer <cracauer@cons.org> Cc: Marty McFadden <mcfadden8@llnl.gov> Cc: Matthew Wilcox <willy@infradead.org> Cc: Maya Gokhale <gokhale2@llnl.gov> Cc: Mel Gorman <mgorman@suse.de> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: Pavel Emelyanov <xemul@openvz.org> Link: http://lkml.kernel.org/r/20200220160230.9598-1-peterx@redhat.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2020-04-02 09:35:29 -07:00
..
autogroup.h
clock.h
coredump.h
cpufreq.h	sched/fair: Remove redundant call to cpufreq_update_util()	2020-01-17 10:19:22 +01:00
cputime.h
deadline.h
debug.h
hotplug.h
idle.h
init.h
isolation.h	genirq, sched/isolation: Isolate from handling managed interrupts	2020-01-22 16:29:49 +01:00
jobctl.h
loadavg.h
mm.h
nohz.h	timers/nohz: Update NOHZ load in remote tick	2020-01-28 21:36:44 +01:00
numa_balancing.h
prio.h
rt.h
signal.h	mm: return faster for non-fatal signals in user mode faults	2020-04-02 09:35:29 -07:00
smt.h
stat.h
sysctl.h
task.h
task_stack.h
topology.h	sched/topology: Add callback to read per CPU thermal pressure	2020-03-06 12:57:17 +01:00
types.h
user.h
wake_q.h
xacct.h