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powerpc: Introduce a new helper to obtain function entry points

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kprobe_lookup_name() is specific to the kprobe subsystem and may not always
return the function entry point (in a subsequent patch for KPROBES_ON_FTRACE).
For looking up function entry points, introduce a separate helper and use it
in optprobes.c

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Naveen N. Rao
2017-04-19 18:22:27 +05:30
committed by Michael Ellerman
parent ead514d5fb
commit 1b32cd1715
2 changed files with 44 additions and 3 deletions
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6
arch/powerpc/kernel/optprobes.c
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@@ -243,10 +243,10 @@ int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *p)
/*
* 2. branch to optimized_callback() and emulate_step()
*/
op_callback_addr = kprobe_lookup_name("optimized_callback", 0);
emulate_step_addr = kprobe_lookup_name("emulate_step", 0);
op_callback_addr = (kprobe_opcode_t *)ppc_kallsyms_lookup_name("optimized_callback");
emulate_step_addr = (kprobe_opcode_t *)ppc_kallsyms_lookup_name("emulate_step");
if (!op_callback_addr || !emulate_step_addr) {
WARN(1, "kprobe_lookup_name() failed\n");
WARN(1, "Unable to lookup optimized_callback()/emulate_step()\n");
goto error;
}