mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2025-01-12 08:00:09 +00:00
6377981faf
A machine check can interrupt the i/o and external interrupt handler anytime. If the machine check occurs while the interrupt handler is waking up from idle vtime_start_cpu can get executed a second time and the int_clock / async_enter_timer values in the lowcore get clobbered. This can confuse the cpu time accounting. To fix this problem two changes are needed. First the machine check handler has to use its own copies of int_clock and async_enter_timer, named mcck_clock and mcck_enter_timer. Second the nested execution of vtime_start_cpu has to be prevented. This is done in s390_idle_check by checking the wait bit in the program status word. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
157 lines
8.3 KiB
C
157 lines
8.3 KiB
C
/*
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* Generate definitions needed by assembly language modules.
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* This code generates raw asm output which is post-processed to extract
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* and format the required data.
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*/
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#define ASM_OFFSETS_C
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#include <linux/kbuild.h>
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#include <linux/sched.h>
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#include <asm/vdso.h>
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#include <asm/sigp.h>
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/*
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* Make sure that the compiler is new enough. We want a compiler that
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* is known to work with the "Q" assembler constraint.
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*/
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#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
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#error Your compiler is too old; please use version 3.3.3 or newer
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#endif
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int main(void)
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{
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DEFINE(__THREAD_info, offsetof(struct task_struct, stack));
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DEFINE(__THREAD_ksp, offsetof(struct task_struct, thread.ksp));
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DEFINE(__THREAD_per, offsetof(struct task_struct, thread.per_info));
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DEFINE(__THREAD_mm_segment, offsetof(struct task_struct, thread.mm_segment));
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BLANK();
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DEFINE(__TASK_pid, offsetof(struct task_struct, pid));
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BLANK();
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DEFINE(__PER_atmid, offsetof(per_struct, lowcore.words.perc_atmid));
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DEFINE(__PER_address, offsetof(per_struct, lowcore.words.address));
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DEFINE(__PER_access_id, offsetof(per_struct, lowcore.words.access_id));
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BLANK();
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DEFINE(__TI_task, offsetof(struct thread_info, task));
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DEFINE(__TI_domain, offsetof(struct thread_info, exec_domain));
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DEFINE(__TI_flags, offsetof(struct thread_info, flags));
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DEFINE(__TI_cpu, offsetof(struct thread_info, cpu));
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DEFINE(__TI_precount, offsetof(struct thread_info, preempt_count));
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DEFINE(__TI_user_timer, offsetof(struct thread_info, user_timer));
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DEFINE(__TI_system_timer, offsetof(struct thread_info, system_timer));
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BLANK();
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DEFINE(__PT_ARGS, offsetof(struct pt_regs, args));
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DEFINE(__PT_PSW, offsetof(struct pt_regs, psw));
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DEFINE(__PT_GPRS, offsetof(struct pt_regs, gprs));
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DEFINE(__PT_ORIG_GPR2, offsetof(struct pt_regs, orig_gpr2));
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DEFINE(__PT_ILC, offsetof(struct pt_regs, ilc));
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DEFINE(__PT_SVCNR, offsetof(struct pt_regs, svcnr));
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DEFINE(__PT_SIZE, sizeof(struct pt_regs));
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BLANK();
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DEFINE(__SF_BACKCHAIN, offsetof(struct stack_frame, back_chain));
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DEFINE(__SF_GPRS, offsetof(struct stack_frame, gprs));
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DEFINE(__SF_EMPTY, offsetof(struct stack_frame, empty1));
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BLANK();
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/* timeval/timezone offsets for use by vdso */
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DEFINE(__VDSO_UPD_COUNT, offsetof(struct vdso_data, tb_update_count));
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DEFINE(__VDSO_XTIME_STAMP, offsetof(struct vdso_data, xtime_tod_stamp));
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DEFINE(__VDSO_XTIME_SEC, offsetof(struct vdso_data, xtime_clock_sec));
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DEFINE(__VDSO_XTIME_NSEC, offsetof(struct vdso_data, xtime_clock_nsec));
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DEFINE(__VDSO_WTOM_SEC, offsetof(struct vdso_data, wtom_clock_sec));
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DEFINE(__VDSO_WTOM_NSEC, offsetof(struct vdso_data, wtom_clock_nsec));
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DEFINE(__VDSO_TIMEZONE, offsetof(struct vdso_data, tz_minuteswest));
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DEFINE(__VDSO_ECTG_OK, offsetof(struct vdso_data, ectg_available));
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DEFINE(__VDSO_NTP_MULT, offsetof(struct vdso_data, ntp_mult));
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DEFINE(__VDSO_ECTG_BASE, offsetof(struct vdso_per_cpu_data, ectg_timer_base));
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DEFINE(__VDSO_ECTG_USER, offsetof(struct vdso_per_cpu_data, ectg_user_time));
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/* constants used by the vdso */
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DEFINE(CLOCK_REALTIME, CLOCK_REALTIME);
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DEFINE(CLOCK_MONOTONIC, CLOCK_MONOTONIC);
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DEFINE(CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC);
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BLANK();
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/* constants for SIGP */
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DEFINE(__SIGP_STOP, sigp_stop);
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DEFINE(__SIGP_RESTART, sigp_restart);
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DEFINE(__SIGP_SENSE, sigp_sense);
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DEFINE(__SIGP_INITIAL_CPU_RESET, sigp_initial_cpu_reset);
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BLANK();
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/* lowcore offsets */
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DEFINE(__LC_EXT_PARAMS, offsetof(struct _lowcore, ext_params));
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DEFINE(__LC_CPU_ADDRESS, offsetof(struct _lowcore, cpu_addr));
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DEFINE(__LC_EXT_INT_CODE, offsetof(struct _lowcore, ext_int_code));
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DEFINE(__LC_SVC_ILC, offsetof(struct _lowcore, svc_ilc));
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DEFINE(__LC_SVC_INT_CODE, offsetof(struct _lowcore, svc_code));
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DEFINE(__LC_PGM_ILC, offsetof(struct _lowcore, pgm_ilc));
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DEFINE(__LC_PGM_INT_CODE, offsetof(struct _lowcore, pgm_code));
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DEFINE(__LC_PER_ATMID, offsetof(struct _lowcore, per_perc_atmid));
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DEFINE(__LC_PER_ADDRESS, offsetof(struct _lowcore, per_address));
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DEFINE(__LC_PER_ACCESS_ID, offsetof(struct _lowcore, per_access_id));
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DEFINE(__LC_AR_MODE_ID, offsetof(struct _lowcore, ar_access_id));
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DEFINE(__LC_SUBCHANNEL_ID, offsetof(struct _lowcore, subchannel_id));
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DEFINE(__LC_SUBCHANNEL_NR, offsetof(struct _lowcore, subchannel_nr));
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DEFINE(__LC_IO_INT_PARM, offsetof(struct _lowcore, io_int_parm));
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DEFINE(__LC_IO_INT_WORD, offsetof(struct _lowcore, io_int_word));
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DEFINE(__LC_STFL_FAC_LIST, offsetof(struct _lowcore, stfl_fac_list));
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DEFINE(__LC_MCCK_CODE, offsetof(struct _lowcore, mcck_interruption_code));
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DEFINE(__LC_DUMP_REIPL, offsetof(struct _lowcore, ipib));
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BLANK();
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DEFINE(__LC_RST_NEW_PSW, offsetof(struct _lowcore, restart_psw));
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DEFINE(__LC_RST_OLD_PSW, offsetof(struct _lowcore, restart_old_psw));
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DEFINE(__LC_EXT_OLD_PSW, offsetof(struct _lowcore, external_old_psw));
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DEFINE(__LC_SVC_OLD_PSW, offsetof(struct _lowcore, svc_old_psw));
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DEFINE(__LC_PGM_OLD_PSW, offsetof(struct _lowcore, program_old_psw));
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DEFINE(__LC_MCK_OLD_PSW, offsetof(struct _lowcore, mcck_old_psw));
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DEFINE(__LC_IO_OLD_PSW, offsetof(struct _lowcore, io_old_psw));
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DEFINE(__LC_EXT_NEW_PSW, offsetof(struct _lowcore, external_new_psw));
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DEFINE(__LC_SVC_NEW_PSW, offsetof(struct _lowcore, svc_new_psw));
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DEFINE(__LC_PGM_NEW_PSW, offsetof(struct _lowcore, program_new_psw));
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DEFINE(__LC_MCK_NEW_PSW, offsetof(struct _lowcore, mcck_new_psw));
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DEFINE(__LC_IO_NEW_PSW, offsetof(struct _lowcore, io_new_psw));
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DEFINE(__LC_SAVE_AREA, offsetof(struct _lowcore, save_area));
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DEFINE(__LC_RETURN_PSW, offsetof(struct _lowcore, return_psw));
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DEFINE(__LC_RETURN_MCCK_PSW, offsetof(struct _lowcore, return_mcck_psw));
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DEFINE(__LC_SYNC_ENTER_TIMER, offsetof(struct _lowcore, sync_enter_timer));
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DEFINE(__LC_ASYNC_ENTER_TIMER, offsetof(struct _lowcore, async_enter_timer));
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DEFINE(__LC_MCCK_ENTER_TIMER, offsetof(struct _lowcore, mcck_enter_timer));
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DEFINE(__LC_EXIT_TIMER, offsetof(struct _lowcore, exit_timer));
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DEFINE(__LC_USER_TIMER, offsetof(struct _lowcore, user_timer));
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DEFINE(__LC_SYSTEM_TIMER, offsetof(struct _lowcore, system_timer));
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DEFINE(__LC_STEAL_TIMER, offsetof(struct _lowcore, steal_timer));
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DEFINE(__LC_LAST_UPDATE_TIMER, offsetof(struct _lowcore, last_update_timer));
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DEFINE(__LC_LAST_UPDATE_CLOCK, offsetof(struct _lowcore, last_update_clock));
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DEFINE(__LC_CURRENT, offsetof(struct _lowcore, current_task));
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DEFINE(__LC_THREAD_INFO, offsetof(struct _lowcore, thread_info));
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DEFINE(__LC_KERNEL_STACK, offsetof(struct _lowcore, kernel_stack));
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DEFINE(__LC_ASYNC_STACK, offsetof(struct _lowcore, async_stack));
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DEFINE(__LC_PANIC_STACK, offsetof(struct _lowcore, panic_stack));
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DEFINE(__LC_KERNEL_ASCE, offsetof(struct _lowcore, kernel_asce));
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DEFINE(__LC_USER_ASCE, offsetof(struct _lowcore, user_asce));
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DEFINE(__LC_USER_EXEC_ASCE, offsetof(struct _lowcore, user_exec_asce));
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DEFINE(__LC_INT_CLOCK, offsetof(struct _lowcore, int_clock));
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DEFINE(__LC_MCCK_CLOCK, offsetof(struct _lowcore, mcck_clock));
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DEFINE(__LC_MACHINE_FLAGS, offsetof(struct _lowcore, machine_flags));
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DEFINE(__LC_FTRACE_FUNC, offsetof(struct _lowcore, ftrace_func));
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DEFINE(__LC_IRB, offsetof(struct _lowcore, irb));
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DEFINE(__LC_CPU_TIMER_SAVE_AREA, offsetof(struct _lowcore, cpu_timer_save_area));
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DEFINE(__LC_CLOCK_COMP_SAVE_AREA, offsetof(struct _lowcore, clock_comp_save_area));
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DEFINE(__LC_PSW_SAVE_AREA, offsetof(struct _lowcore, psw_save_area));
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DEFINE(__LC_PREFIX_SAVE_AREA, offsetof(struct _lowcore, prefixreg_save_area));
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DEFINE(__LC_AREGS_SAVE_AREA, offsetof(struct _lowcore, access_regs_save_area));
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DEFINE(__LC_FPREGS_SAVE_AREA, offsetof(struct _lowcore, floating_pt_save_area));
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DEFINE(__LC_GPREGS_SAVE_AREA, offsetof(struct _lowcore, gpregs_save_area));
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DEFINE(__LC_CREGS_SAVE_AREA, offsetof(struct _lowcore, cregs_save_area));
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#ifdef CONFIG_32BIT
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DEFINE(__LC_PFAULT_INTPARM, offsetof(struct _lowcore, ext_params));
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DEFINE(SAVE_AREA_BASE, offsetof(struct _lowcore, extended_save_area_addr));
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#else /* CONFIG_32BIT */
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DEFINE(__LC_PFAULT_INTPARM, offsetof(struct _lowcore, ext_params2));
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DEFINE(__LC_EXT_PARAMS2, offsetof(struct _lowcore, ext_params2));
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DEFINE(SAVE_AREA_BASE, offsetof(struct _lowcore, floating_pt_save_area));
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DEFINE(__LC_PASTE, offsetof(struct _lowcore, paste));
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DEFINE(__LC_FP_CREG_SAVE_AREA, offsetof(struct _lowcore, fpt_creg_save_area));
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DEFINE(__LC_LAST_BREAK, offsetof(struct _lowcore, breaking_event_addr));
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DEFINE(__LC_VDSO_PER_CPU, offsetof(struct _lowcore, vdso_per_cpu_data));
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#endif /* CONFIG_32BIT */
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return 0;
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}
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