x86/fpu: Fix __user annotations

In save_xstate_epilog(), use __user when type-casting userspace
pointers.

In setup_sigcontext() and x32_setup_rt_frame(), cast the userspace
pointers to 'unsigned long __user *' before writing into them. These
pointers are originally '__u32 __user *' or '__u64 __user *', causing
sparse to complain when a userspace pointer is written into them. The
casts are okay because the pointers always point to pointer-sized
values.

Thanks to Luc Van Oostenryck and Al Viro for explaining this to me.

Signed-off-by: Jann Horn <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Mukesh Ojha <[email protected]>
Cc: Qiaowei Ren <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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