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MIPS: Get rid of finish_arch_switch().
MIPS was using finish_arch_switch() as a hook to restore and initialize CPU context for all threads, even newly created kernel and user threads. This is however entirely solvable within switch_to() so get rid of finish_arch_switch() which is in the way of scheduler cleanups. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -83,45 +83,43 @@ do { if (cpu_has_rw_llb) { \
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} \
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} while (0)
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/*
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* For newly created kernel threads switch_to() will return to
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* ret_from_kernel_thread, newly created user threads to ret_from_fork.
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* That is, everything following resume() will be skipped for new threads.
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* So everything that matters to new threads should be placed before resume().
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*/
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#define switch_to(prev, next, last) \
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do { \
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u32 __c0_stat; \
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s32 __fpsave = FP_SAVE_NONE; \
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__mips_mt_fpaff_switch_to(prev); \
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if (cpu_has_dsp) \
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if (cpu_has_dsp) { \
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__save_dsp(prev); \
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if (cop2_present && (KSTK_STATUS(prev) & ST0_CU2)) { \
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if (cop2_lazy_restore) \
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KSTK_STATUS(prev) &= ~ST0_CU2; \
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__c0_stat = read_c0_status(); \
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write_c0_status(__c0_stat | ST0_CU2); \
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cop2_save(prev); \
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write_c0_status(__c0_stat & ~ST0_CU2); \
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__restore_dsp(next); \
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} \
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if (cop2_present) { \
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set_c0_status(ST0_CU2); \
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if ((KSTK_STATUS(prev) & ST0_CU2)) { \
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if (cop2_lazy_restore) \
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KSTK_STATUS(prev) &= ~ST0_CU2; \
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cop2_save(prev); \
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} \
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if (KSTK_STATUS(next) & ST0_CU2 && \
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!cop2_lazy_restore) { \
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cop2_restore(next); \
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} \
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clear_c0_status(ST0_CU2); \
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} \
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__clear_software_ll_bit(); \
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if (test_and_clear_tsk_thread_flag(prev, TIF_USEDFPU)) \
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__fpsave = FP_SAVE_SCALAR; \
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if (test_and_clear_tsk_thread_flag(prev, TIF_USEDMSA)) \
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__fpsave = FP_SAVE_VECTOR; \
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if (cpu_has_userlocal) \
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write_c0_userlocal(task_thread_info(next)->tp_value); \
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__restore_watch(); \
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disable_msa(); \
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(last) = resume(prev, next, task_thread_info(next), __fpsave); \
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} while (0)
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#define finish_arch_switch(prev) \
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do { \
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u32 __c0_stat; \
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if (cop2_present && !cop2_lazy_restore && \
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(KSTK_STATUS(current) & ST0_CU2)) { \
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__c0_stat = read_c0_status(); \
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write_c0_status(__c0_stat | ST0_CU2); \
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cop2_restore(current); \
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write_c0_status(__c0_stat & ~ST0_CU2); \
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} \
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if (cpu_has_dsp) \
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__restore_dsp(current); \
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if (cpu_has_userlocal) \
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write_c0_userlocal(current_thread_info()->tp_value); \
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__restore_watch(); \
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disable_msa(); \
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} while (0)
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#endif /* _ASM_SWITCH_TO_H */
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