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arm64: ftrace: fix ftrace_modify_graph_caller for branch replace

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ftrace_enable_ftrace_graph_caller and ftrace_disable_ftrace_graph_caller
should replace B(jmp) instruction and not BL(call) instruction.

Commit 9f1ae7596aad("arm64: Correct ftrace calls to
aarch64_insn_gen_branch_imm()") had a typo and used
AARCH64_INSN_BRANCH_LINK instead of AARCH64_INSN_BRANCH_NOLINK.

Either instruction will work, as the link register is saved/restored
across the branch but this better matches the intention of the code.

Signed-off-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Pratyush Anand
2015-02-13 04:06:21 +00:00
committed by Will Deacon
parent c517d838eb
commit d0d6223018
1 changed files with 1 additions and 1 deletions
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arch/arm64/kernel/ftrace.c
+1 -1
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@@ -156,7 +156,7 @@ static int ftrace_modify_graph_caller(bool enable)
branch = aarch64_insn_gen_branch_imm(pc,
(unsigned long)ftrace_graph_caller,
AARCH64_INSN_BRANCH_LINK);
AARCH64_INSN_BRANCH_NOLINK);
nop = aarch64_insn_gen_nop();
if (enable)