diff options
| author | Jordan Niethe <jniethe5@gmail.com> | 2020-05-06 13:40:32 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-19 00:10:37 +1000 |
| commit | f8faaffaa7d99028e457ef2d1dcb43a98f736938 (patch) | |
| tree | 0e987e7b6862e3412816dec98b222f036931cdc8 /arch/powerpc/kernel/trace/ftrace.c | |
| parent | 94afd069d937d84fb4f696eb9a78db4084e43d21 (diff) | |
powerpc: Use a function for reading instructions
Prefixed instructions will mean there are instructions of different
length. As a result dereferencing a pointer to an instruction will not
necessarily give the desired result. Introduce a function for reading
instructions from memory into the instruction data type.
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Alistair Popple <alistair@popple.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-13-jniethe5@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/trace/ftrace.c')
| -rw-r--r-- | arch/powerpc/kernel/trace/ftrace.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c index 3117ed675735..acd5b889815f 100644 --- a/arch/powerpc/kernel/trace/ftrace.c +++ b/arch/powerpc/kernel/trace/ftrace.c @@ -848,7 +848,7 @@ int ftrace_update_ftrace_func(ftrace_func_t func) struct ppc_inst old, new; int ret; - old = *(struct ppc_inst *)&ftrace_call; + old = ppc_inst_read((struct ppc_inst *)&ftrace_call); new = ftrace_call_replace(ip, (unsigned long)func, 1); ret = ftrace_modify_code(ip, old, new); @@ -856,7 +856,7 @@ int ftrace_update_ftrace_func(ftrace_func_t func) /* Also update the regs callback function */ if (!ret) { ip = (unsigned long)(&ftrace_regs_call); - old = *(struct ppc_inst *)&ftrace_regs_call; + old = ppc_inst_read((struct ppc_inst *)&ftrace_regs_call); new = ftrace_call_replace(ip, (unsigned long)func, 1); ret = ftrace_modify_code(ip, old, new); } |