mainline inclusion
from mainline-v5.14-rc1
commit a75c5289
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I590ZC
CVE: NA

Intel-SIG: commit a75c5289 x86/fpu/xstate: Sanitize handling of independent features.

--------------------------------

The copy functions for the independent features are horribly named and the
supervisor and independent part is just overengineered.

The point is that the supplied mask has either to be a subset of the
independent features or a subset of the task->fpu.xstate managed features.

Rewrite it so it checks for invalid overlaps of these areas in the caller
supplied feature mask. Rename it so it follows the new naming convention
for these operations. Mop up the function documentation.

This allows to use that function for other purposes as well.
Suggested-by: NPeter Zijlstra <peterz@infradead.org>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Tested-by: NKan Liang <kan.liang@linux.intel.com>
Link: https://lkml.kernel.org/r/20210623121455.004880675@linutronix.deSigned-off-by: NLin Wang <lin.x.wang@intel.com>