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Christophe Leroy authored
current_stack_frame() doesn't return the stack pointer, but the caller's stack frame. See commit bfe9a2cf ("powerpc: Reimplement __get_SP() as a function not a define") and commit acf620ec ("powerpc: Rename __get_SP() to current_stack_pointer()") for details. In some cases this is overkill or incorrect, as it doesn't return the current value of r1. So add a current_stack_pointer register global to get the value of r1 directly. Signed-off-by:
Christophe Leroy <christophe.leroy@c-s.fr> [mpe: Split out of other patch, tweak change log] Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200220115141.2707-2-mpe@ellerman.id.au
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