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| author |   Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2017-04-19 18:22:24 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2017-04-24 19:07:57 +1000 |
| commit | 2f59be5b970b503ca8db1cb723b155e455ebac8e (patch) | |
| tree | ad022579451aa590a33450abed9fd5d4426e7460 /Documentation/features | |
| parent | powerpc/kprobes: Emulate instructions on kprobe handler re-entry (diff) | |
| download | linux-dev-2f59be5b970b503ca8db1cb723b155e455ebac8e.tar.xz linux-dev-2f59be5b970b503ca8db1cb723b155e455ebac8e.zip | |
powerpc/ftrace: Restore LR from pt_regs
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>
Diffstat (limited to 'Documentation/features')
0 files changed, 0 insertions, 0 deletions