x86/kprobes: Identify far indirect JMP correctly
[ Upstream commit a194acd3 ] Since Grp5 far indirect JMP is FF "mod 101 r/m", it should be (modrm & 0x38) == 0x28, and near indirect JMP is also 0x38 == 0x20. So we can mask modrm with 0x30 and check 0x20. This is actually what the original code does, it also doesn't care the last bit. So the result code is same. Thus, I think this is just a cosmetic cleanup. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/161469873475.49483.13257083019966335137.stgit@devnote2 Signed-off-by: Li Huafei <lihuafei1@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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