mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
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>
This commit is contained in:
parent
f1f5e41485
commit
f51246efee
|
@ -83,45 +83,43 @@ do { if (cpu_has_rw_llb) { \
|
|||
} \
|
||||
} while (0)
|
||||
|
||||
/*
|
||||
* For newly created kernel threads switch_to() will return to
|
||||
* ret_from_kernel_thread, newly created user threads to ret_from_fork.
|
||||
* That is, everything following resume() will be skipped for new threads.
|
||||
* So everything that matters to new threads should be placed before resume().
|
||||
*/
|
||||
#define switch_to(prev, next, last) \
|
||||
do { \
|
||||
u32 __c0_stat; \
|
||||
s32 __fpsave = FP_SAVE_NONE; \
|
||||
__mips_mt_fpaff_switch_to(prev); \
|
||||
if (cpu_has_dsp) \
|
||||
if (cpu_has_dsp) { \
|
||||
__save_dsp(prev); \
|
||||
if (cop2_present && (KSTK_STATUS(prev) & ST0_CU2)) { \
|
||||
if (cop2_lazy_restore) \
|
||||
KSTK_STATUS(prev) &= ~ST0_CU2; \
|
||||
__c0_stat = read_c0_status(); \
|
||||
write_c0_status(__c0_stat | ST0_CU2); \
|
||||
cop2_save(prev); \
|
||||
write_c0_status(__c0_stat & ~ST0_CU2); \
|
||||
__restore_dsp(next); \
|
||||
} \
|
||||
if (cop2_present) { \
|
||||
set_c0_status(ST0_CU2); \
|
||||
if ((KSTK_STATUS(prev) & ST0_CU2)) { \
|
||||
if (cop2_lazy_restore) \
|
||||
KSTK_STATUS(prev) &= ~ST0_CU2; \
|
||||
cop2_save(prev); \
|
||||
} \
|
||||
if (KSTK_STATUS(next) & ST0_CU2 && \
|
||||
!cop2_lazy_restore) { \
|
||||
cop2_restore(next); \
|
||||
} \
|
||||
clear_c0_status(ST0_CU2); \
|
||||
} \
|
||||
__clear_software_ll_bit(); \
|
||||
if (test_and_clear_tsk_thread_flag(prev, TIF_USEDFPU)) \
|
||||
__fpsave = FP_SAVE_SCALAR; \
|
||||
if (test_and_clear_tsk_thread_flag(prev, TIF_USEDMSA)) \
|
||||
__fpsave = FP_SAVE_VECTOR; \
|
||||
if (cpu_has_userlocal) \
|
||||
write_c0_userlocal(task_thread_info(next)->tp_value); \
|
||||
__restore_watch(); \
|
||||
disable_msa(); \
|
||||
(last) = resume(prev, next, task_thread_info(next), __fpsave); \
|
||||
} while (0)
|
||||
|
||||
#define finish_arch_switch(prev) \
|
||||
do { \
|
||||
u32 __c0_stat; \
|
||||
if (cop2_present && !cop2_lazy_restore && \
|
||||
(KSTK_STATUS(current) & ST0_CU2)) { \
|
||||
__c0_stat = read_c0_status(); \
|
||||
write_c0_status(__c0_stat | ST0_CU2); \
|
||||
cop2_restore(current); \
|
||||
write_c0_status(__c0_stat & ~ST0_CU2); \
|
||||
} \
|
||||
if (cpu_has_dsp) \
|
||||
__restore_dsp(current); \
|
||||
if (cpu_has_userlocal) \
|
||||
write_c0_userlocal(current_thread_info()->tp_value); \
|
||||
__restore_watch(); \
|
||||
disable_msa(); \
|
||||
} while (0)
|
||||
|
||||
#endif /* _ASM_SWITCH_TO_H */
|
||||
|
|
Loading…
Reference in a new issue