ldt_usr_sem 31 arch/x86/include/asm/mmu.h struct rw_semaphore ldt_usr_sem; ldt_usr_sem 84 arch/x86/include/asm/mmu_context.h init_rwsem(&mm->context.ldt_usr_sem); ldt_usr_sem 416 arch/x86/kernel/ldt.c down_read(&mm->context.ldt_usr_sem); ldt_usr_sem 445 arch/x86/kernel/ldt.c up_read(&mm->context.ldt_usr_sem); ldt_usr_sem 505 arch/x86/kernel/ldt.c if (down_write_killable(&mm->context.ldt_usr_sem)) ldt_usr_sem 548 arch/x86/kernel/ldt.c up_write(&mm->context.ldt_usr_sem);