Commit 8b9a65fd authored by Peter Xu's avatar Peter Xu Committed by Linus Torvalds

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: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Suggested-by: default avatarAndrea Arcangeli <aarcange@redhat.com>
Signed-off-by: default avatarPeter Xu <peterx@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Tested-by: default avatarBrian 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.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fb027ada
...@@ -381,7 +381,8 @@ static inline bool fault_signal_pending(vm_fault_t fault_flags, ...@@ -381,7 +381,8 @@ static inline bool fault_signal_pending(vm_fault_t fault_flags,
struct pt_regs *regs) struct pt_regs *regs)
{ {
return unlikely((fault_flags & VM_FAULT_RETRY) && return unlikely((fault_flags & VM_FAULT_RETRY) &&
fatal_signal_pending(current)); (fatal_signal_pending(current) ||
(user_mode(regs) && signal_pending(current))));
} }
/* /*
......
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