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This patch removes mm->mmap_sem from mm->exe_file read side. Also it kills dup_mm_exe_file() and moves exe_file duplication into dup_mmap() where both mmap_sems are locked. [akpm@linux-foundation.org: fix comment typo] Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Oleg Nesterov <oleg@redhat.com> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> [haggertk: Backport to 3.4; __fget() in fs/file.c not applicable] Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org> Change-Id: I7fbc5b638f9ac9e74cd9adfdfb92c81e1146080c