powerpc/32: Don't add dummy frames when calling trace_hardirqs_on/off

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No need to add dummy frames when calling trace_hardirqs_on or
trace_hardirqs_off. GCC properly handles empty stacks.

In addition, powerpc doesn't set CONFIG_FRAME_POINTER, therefore
__builtin_return_address(1..) returns NULL at all time. So the
dummy frames are definitely unneeded here.

In the meantime, avoid reading memory for loading r1 with a value
we already know.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Christophe Leroy 2019-04-30 12:39:05 +00:00 • committed by Michael Ellerman

parent 38b4564cf0

commit d1865e71cd

1 changed files with 2 additions and 14 deletions

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arch/powerpc/kernel/entry_32.S

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