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x86/process: Clone FPU in copy_thread()

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There is no reason to clone FPU in arch_dup_task_struct(). Quite the
contrary - it prevents optimizations. Move it to copy_thread().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20211015011538.780714235@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-10-15 03:16:04 +02:00 committed by Borislav Petkov
parent 01f9f62d3a
commit 2d16a1876f
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kernel/process.c
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@ -87,7 +87,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
#ifdef CONFIG_VM86
dst->thread.vm86 = NULL;
#endif
return fpu_clone(dst);
return 0;
}
/*
@ -154,6 +154,8 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg,
frame->flags = X86_EFLAGS_FIXED;
#endif
fpu_clone(p);
/* Kernel thread ? */
if (unlikely(p->flags & PF_KTHREAD)) {
p->thread.pkru = pkru_get_init_value();