The following commit has been merged into the x86/fpu branch of tip: Commit-ID: 2d16a1876f20218f8970ea4b7f679cead1cdb510 Gitweb: https://git.kernel.org/tip/2d16a1876f20218f8970ea4b7f679cead1cdb510 Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx> AuthorDate: Fri, 15 Oct 2021 03:16:04 +02:00 Committer: Borislav Petkov <bp@xxxxxxx> CommitterDate: Wed, 20 Oct 2021 15:27:26 +02:00 x86/process: Clone FPU in copy_thread() 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@xxxxxxxxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Link: https://lkml.kernel.org/r/20211015011538.780714235@xxxxxxxxxxxxx --- arch/x86/kernel/process.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 1d9463e..d2227c5 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -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();
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