selftest/powerpc: Add test for sigreturn in transaction
Ensure that kernel is throwing away the suspended transaction when sigreturn() is called otherwise it if fails to restore the signal frame's TM SPRS. Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com> Reviewed-by: Cyril Bur <cyrilbur@gmail.com> [mpe: Add have_htm() check, minor formatting, add SPDX tag] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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