mainline inclusion
from mainline-v5.14-rc1
commit 8919f072
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I590ZC
CVE: NA

Intel-SIG: commit 8919f072 selftest/x86/signal: Include test cases for validating sigaltstack.

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

The test measures the kernel's signal delivery with different (enough vs.
insufficient) stack sizes.
Signed-off-by: NChang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Reviewed-by: NLen Brown <len.brown@intel.com>
Acked-by: NThomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20210518200320.17239-7-chang.seok.bae@intel.comSigned-off-by: NLin Wang <lin.x.wang@intel.com>