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| author |   Paul Burton <paul.burton@mips.com> | 2018-12-17 22:05:40 -0800 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2018-12-17 22:05:40 -0800 |
| commit | 41e486f4f66d3e646fedd60469bc60e73662de50 (patch) | |
| tree | 9bc08f9a8d3fecc0ad3832577ef9e1fa18ce0259 /arch/mips | |
| parent | mips: generate uapi header and system call table files (diff) | |
| download | linux-dev-41e486f4f66d3e646fedd60469bc60e73662de50.tar.xz linux-dev-41e486f4f66d3e646fedd60469bc60e73662de50.zip | |
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 8c8d953c2800 ("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>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/include/asm/mmu.h | 1 | ||||
| -rw-r--r-- | arch/mips/kernel/process.c | 9 |
2 files changed, 3 insertions, 7 deletions
diff --git a/arch/mips/include/asm/mmu.h b/arch/mips/include/asm/mmu.h index 24d6b42345fb..88a108ce62c1 100644 --- a/arch/mips/include/asm/mmu.h +++ b/arch/mips/include/asm/mmu.h @@ -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; diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index d4f7fd4550e1..6829a064aac8 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -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; } |