powerpc/ftrace: Restore LR from pt_regs

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Pass the real LR to the ftrace handler. This is needed for KPROBES_ON_FTRACE for
the pre handlers.

Also, with KPROBES_ON_FTRACE, the link register may be updated by the pre
handlers or by a registed kretprobe. Honor updated LR by restoring it from
pt_regs, rather than from the stack save area.

Live patch and function graph continue to work fine with this change.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Naveen N. Rao 2017-04-19 18:22:24 +05:30 • committed by Michael Ellerman

parent 22d8b3dec2

commit 2f59be5b97

1 changed files with 7 additions and 6 deletions

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arch/powerpc/kernel/entry_64.S

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