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MIPS: Remove struct mm_context_t fp_mode_switching field 

The fp_mode_switching field in struct mm_context_t was left unused by
commit 8c8d953c28 ("MIPS: Schedule on CPUs we need to lose FPU for a
mode switch") in v4.19, with nothing modifying its value & nothing
waiting on it having any particular value after that commit. Remove the
unused field & the one remaining reference to it.

Signed-off-by: Paul Burton <paul.burton@mips.com>
hifive-unleashed-5.1
Paul Burton 2018-12-17 22:05:40 -08:00
parent 99bf73ebf9
commit 41e486f4f6
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
2 changed files with 3 additions and 7 deletions
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1
arch/mips/include/asm/mmu.h
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@ -9,7 +9,6 @@
typedef struct {
u64 asid[NR_CPUS];
void *vdso;
atomic_t fp_mode_switching;
/* lock to be held whilst modifying fp_bd_emupage_allocmap */
spinlock_t bd_emupage_lock;

9
arch/mips/kernel/process.c
View File

@ -737,10 +737,9 @@ static long prepare_for_fp_mode_switch(void *unused)
/*
* This is icky, but we use this to simply ensure that all CPUs have
* context switched, regardless of whether they were previously running
* kernel or user code. This ensures that no CPU currently has its FPU
* enabled, or is about to attempt to enable it through any path other
* than enable_restore_fp_context() which will wait appropriately for
* fp_mode_switching to be zero.
* kernel or user code. This ensures that no CPU that a mode-switching
* program may execute on keeps its FPU enabled (& in the old mode)
* throughout the mode switch.
*/
return 0;
}
@ -829,8 +828,6 @@ int mips_set_process_fp_mode(struct task_struct *task, unsigned int value)
work_on_cpu(cpu, prepare_for_fp_mode_switch, NULL);
put_online_cpus();
wake_up_var(&task->mm->context.fp_mode_switching);
return 0;
}