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| author | Anton Blanchard <anton@samba.org> | 2015-10-29 11:44:09 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-12-02 19:34:40 +1100 |
| commit | 579e633e764e6e5f7784b74e7df3e81fe11f40de (patch) | |
| tree | b2c0152e295aaee02ffe74eba1b567b404115593 /arch/powerpc/kernel/process.c | |
| parent | c208505900b232ecdc81dee54cb3a032e75d88d6 (diff) | |
| download | lwn-579e633e764e6e5f7784b74e7df3e81fe11f40de.tar.gz lwn-579e633e764e6e5f7784b74e7df3e81fe11f40de.zip | |
powerpc: create flush_all_to_thread()
Create a single function that flushes everything (FP, VMX, VSX, SPE).
Doing this all at once means we only do one MSR write.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 4c087b9ed2d6..7f437e7b273e 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -367,6 +367,23 @@ void giveup_all(struct task_struct *tsk) } EXPORT_SYMBOL(giveup_all); +void flush_all_to_thread(struct task_struct *tsk) +{ + if (tsk->thread.regs) { + preempt_disable(); + BUG_ON(tsk != current); + giveup_all(tsk); + +#ifdef CONFIG_SPE + if (tsk->thread.regs->msr & MSR_SPE) + tsk->thread.spefscr = mfspr(SPRN_SPEFSCR); +#endif + + preempt_enable(); + } +} +EXPORT_SYMBOL(flush_all_to_thread); + #ifdef CONFIG_PPC_ADV_DEBUG_REGS void do_send_trap(struct pt_regs *regs, unsigned long address, unsigned long error_code, int signal_code, int breakpt) @@ -1137,10 +1154,7 @@ release_thread(struct task_struct *t) */ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) { - flush_fp_to_thread(src); - flush_altivec_to_thread(src); - flush_vsx_to_thread(src); - flush_spe_to_thread(src); + flush_all_to_thread(src); /* * Flush TM state out so we can copy it. __switch_to_tm() does this * flush but it removes the checkpointed state from the current CPU and |